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ProtEX-MAX PD8-6080/PD8-6081 Modbus® Scanners
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
• Fully-Approved Explosion-Proof Modbus® Scanners
• Modbus RS-485 RTU Scanner as Master, Slave, or Snooper
• Dual Analog Inputs (0-20 mA, 4-20 mA, 0-5 V, 1-5 V, and ±10 V)
• On-Board USB & RS-485 Serial Communication Standard
• Decimal or Feet & Inches (with Eighths & Sixteenths) Display Options
• Poll and Display up to 16 Process Variables
• Add, Diff, Avg, Multi, Div, Min, Max, Weighted Avg, Ratio, Concentration, & More
• Dual-Line 6-Digit Display, 0.6" (15 mm) & 0.46" (12 mm)
• SafeTouch Through-Glass Button Programming
• Display Mountable at 0°, 90°, 180°, & 270°
• Isolated 24 VDC @ 25 mA Transmitter Power Supply
• 4 Relays with Interlocking Capability + Isolated 4-20 mA Output Option
• Password Protection
• Free PC-Based, On-Board, ScanView USB Programming Software
• SunBright Display Standard Feature; Great for Outdoor Applications
• Operating Temperature Range: -40 to 60°C (-40 to 140°F)
• FM Approved as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
• CSA Certified as Explosion-Proof / Dust-Ignition-Proof / Flame-Proof
• ATEX and IECEx Certified as Flame-Proof
• Input Power Options: 85-265 VAC / 90-265 VDC or 12-24 VDC / 12-24 VAC
• Multi-Pump Alternation Control
• 32-Point, Square Root, or Exponential Linearization
• Flanges for Wall or Pipe Mounting
• Explosion-Proof, IP68, NEMA 4X Die-Cast Aluminum Enclosure
• Four 3/4" NPT Threaded Conduit Openings (Two Plugs Installed)
• Pipe Mounting Kits
• Stainless Steel Tag Available
• 3-Year Warranty
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Disclaimer
The information contained in this document is
subject to change without notice. Precision Digital
makes no representations or warranties with
respect to the contents hereof and specifically
disclaims any implied warranties of
merchantability or fitness for a particular purpose.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
• Read complete instructions prior to installation
and operation of the meter.
• Risk of electric shock or personal injury.
• This product is not recommended for life support
applications or applications where malfunctioning
could result in personal injury or property loss.
Anyone using this product for such applications
does so at his/her own risk. Precision Digital
Corporation shall not be held liable for damages
resulting from such improper use.
• Failure to follow installation guidelines could
result in death or serious injury. Make sure only
qualified personnel perform the installation.
• Never remove the meter cover in explosive
environments when the circuit is live.
• Cover must be fully engaged to meet
explosion-proof/dust-ignition-proof/flame-proof
requirements.
WARNING
Cancer and Reproductive Harm - www.P65Warnings.ca.gov
Limited Warranty
Precision Digital Corporation warrants this
product against defects in material or
workmanship for the specified period under
“Specifications” from the date of shipment from
the factory. Precision Digital’s liability under this
limited warranty shall not exceed the purchase
value, repair, or replacement of the defective unit.
See Warranty Information and Terms &
Conditions on www.predig.com for complete
details.
Registered Trademarks
All trademarks mentioned in this document are
the property of their respective owners.
© 2022 Precision Digital Corporation.
All rights reserved.
FREE ScanView
Programming Software
The scanner can be powered from the USB connection. When
using the USB connection, DO NOT apply AC or DC power to
the scanner.
The easiest and quickest way to program your
ProtEX-MAX Modbus scanner is to use the FREE
ScanView programming software. This software is
loaded into the scanner and connects and installs
directly to your PC with a USB cable. We recommend
that the first thing you do after taking the Modbus
scanner out of the box is connect it to your PC with
the provided USB cable – do not use a different cable.
DO NOT apply AC or DC power to the scanner while
your PC is connected to the scanner as it will disrupt
the USB connection.
ScanView programming software is intuitive, and
most customers can get their scanner programmed as
they like without even looking in the manual.
For more information on ScanView visit
www.predig.com/ScanView
In addition to programming, the software may be used
for:
• Monitoring
• Datalogging using your PC
• Generating and saving programming files for
later use
Once your Modbus scanner is programmed the way
you want it, you can wire it up for your application per
the instructions in this manual and install it. If you find
that you need to make adjustments to the
programming after the scanner is installed, you can
use the programming buttons and the instructions in
this manual to do so.
• The meter should only be connected to a
computer while it is located in a safe area.
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Table of Contents
Introduction ......................................................................................................... 8
Ordering Information .......................................................................................... 8
Key Features ....................................................................................................... 9
Specifications ................................................................................................... 16
Operating Modes .......................................................................................... 16
Master & Snooper Settings ......................................................................... 16
PV Settings ................................................................................................... 16
Display Settings ........................................................................................... 16
Math Functions ............................................................................................. 17
General ................................................................................................ .......... 17
Serial Communications ............................................................................... 18
Dual Process Inputs ..................................................................................... 18
Relays ............................................................................................................ 19
Isolated 4-20 mA Transmitter Output ......................................................... 19
USB Connection ........................................................................................... 20
Digital Input (F4) ........................................................................................... 20
Digital Inputs & Outputs .............................................................................. 20
ScanView Software ...................................................................................... 20
Compliance Information................................................................................... 21
Electromagnetic Compatibility .................................................................... 21
Product Ratings and Approvals .................................................................. 21
EU Declaration of Conformity .......................................................................... 22
Safety Information ............................................................................................ 22
Installation .......................................................................................................... 22
Mounting ....................................................................................................... 23
Installation Overview ................................................................................... 25
ScanView Software ...................................................................................... 25
Transmitter Supply Voltage Selection (P+, P-) .......................................... 27
Connections ................................................................................................. 27
Required & Factory Wired Connection ....................................................... 27
PROVU Electronics Module Layout ............................................................. 28
USB Connection ........................................................................................ 28
Power Connections .................................................................................... 29
RS-485 Connections .................................................................................. 30
RS-485 Multi-Drop Connection .................................................................. 30
Digital I/O Connections .............................................................................. 30
F4 Digital Input Connections ...................................................................... 30
Relay Connections ..................................................................................... 31
Interlock Relay Feature .............................................................................. 31
Switching Inductive Loads.......................................................................... 31
4-20 mA Output Connections ..................................................................... 32
Analog Output Power Supply ..................................................................... 32
Remote Programming ................................................................................ 32
Analog Input Signal Connections ............................................................... 33
Setup and Programming .................................................................................. 34
Overview ....................................................................................................... 34
LED Status Indicators .................................................................................. 34
Programming Buttons ................................................................................. 36
SafeTouch Buttons ...................................................................................... 36
Display Functions & Messages ................................................................... 37
Menu Navigation Tip ................................................................ .................... 40
Setting Numeric Values ............................................................................... 40
Main Menu ..................................................................................................... 40
Serial Communications (serial) ................................................................ 41
Scanner Mode Selection .............................................................................. 42
Operating Modes (nmode) .......................................................................... 42
How to Enable Process Variables (PVs) ..................................................... 42
Master Mode (nmastr) ............................................................................... 43
Snooper Mode (Snoopr) ............................................................................ 44
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How to Select 5 or 6-Digit Registers ........................................................... 45
Slave Mode (SlaVe) ................................................................................... 45
Setting Up the Scanner (setup)................................................................... 46
Setting Up the Process Variables (PVs) (pV setup) ................................. 47
Setting the Display Decimal Point (disp.dp) ............................................... 48
Setting the Float Decimal Point (Flot..dp)................................................... 48
Scaling the PV Display Values (sCale) ..................................................... 48
Setting Up the Displays (dsplay setup) .................................................... 49
Display Line 1 Parameters (Line 1 dsplay) ............................................ 49
Display Line 2 Parameters (Line 2 dsplay) ............................................ 49
Display Intensity (d-IntY).......................................................................... 49
Display Line 1 Menu (Line 1 dsplay) ..................................................... 50
Display Line 2 Menu (Line 2 dsplay) ..................................................... 51
Setting the Tags (tAg) & Units (units) ..................................................... 52
Application Example 1 ............................................................................... 52
Application Example 2 ............................................................................... 54
Setting the Relay Operation (relay) ........................................................... 55
Relay Setup Menu (relay setup) ............................................................ 55
Setting the Relay Action (act 1) ............................................................... 56
Programming Set and Reset Points ........................................................... 56
Setting Fail-Safe Operation (failsf) ........................................................ 56
Programming Time Delay (delay) ............................................................. 56
Relay Action for Communications Break (break) ...................................... 56
Relay Action for Loss of 4-20 mA Input (Loop Break) ................................ 57
Time Delay Operation ................................................................................ 57
Relay Sampling Operation ......................................................................... 57
Relay and Alarm Operation Diagrams ........................................................ 58
High Alarm Operation (Set > Reset) ............................................................. 58
Low Alarm Operation (Set < Reset) ........................................................... 58
High Alarm with Fail-Safe Operation (Set > Reset) .................................... 58
Low Alarm with Fail-Safe Operation (Set < Reset)..................................... 58
Pump Alternation Control Operation .......................................................... 59
Relay Operation After Communications Break........................................... 59
Relay Operation Details ............................................................................... 60
Overview .................................................................................................... 60
Relays Auto Initialization ............................................................................ 60
Fail-Safe Operation (failsf) ..................................................................... 60
Front Panel LEDs ....................................................................................... 60
Latching and Non-Latching Relay Operation ............................................. 60
Non-Latching Relay (Auto) ........................................................................ 61
Non-Latching Relay with Manual Reset (A-nman) ...................................... 61
Latching Relay (LatcH) .............................................................................. 61
Latching Relay with Clear (Lt-Clr) ........................................................... 61
Acknowledging Relays ............................................................................... 62
Pump Alternation Control Applications (Altern) ....................................... 62
Setting Up the Interlock Relay (Force On) Feature .................................... 63
Scaling the 4-20 mA Analog Output (Aout) ................................................ 63
Setting Up the Password (pass) .................................................................. 64
Protecting or Locking the Scanner ............................................................. 64
Making Changes to a Password Protected Scanner .................................. 64
Disabling Password Protection .................................................................. 64
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
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Advanced Features Menu ............................................................................ 65
Advanced Menu Navigation Tips ............................................................... 65
Advanced Features Menu & Display Messages ......................................... 65
Scan Function (SCan) ................................................................................. 67
Manual Control Menu (Contrl) ................................................................. 68
Noise Filter (filter) ................................................................................. 69
Noise Filter Bypass (bypass) ..................................................................... 69
Rounding Feature (round) ......................................................................... 69
Select Menu (SELect) ................................................................................ 69
Low-Value Cutoff (CutofF) ........................................................................ 77
Analog Output Source Programming (aoutpr) .......................................... 77
Programmable Function Keys User Menu (user) ...................................... 79
Digital Input Menu (dI 1) ........................................................................... 80
Digital Output Menu (dO 1) ........................................................................ 80
Reset Menu (reset) .................................................................................. 80
Input Calibration (ICAL).............................................................................. 81
Recalibrating the Analog Input Channels (Ch-A & Ch-B) ........................... 81
Scanner Operation ........................................................................................... 82
Button Operation .......................................................................................... 82
SafeTouch Buttons ...................................................................................... 82
Function Keys Operation ............................................................................. 83
Digital Inputs Operation ............................................................................... 83
Maximum/Minimum Readings ..................................................................... 83
Troubleshooting ............................................................................................... 83
Diagnostics Menu (diag) ............................................................................. 83
Testing the Display LEDs ........................................................................... 83
Determining Software Version ................................................................... 84
Reset Scanner to Factory Defaults ............................................................. 84
Factory Defaults & User Settings ............................................................... 84
Troubleshooting Tips ................................................................................... 86
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Table of Figures
Figure 1. Enclosure Dimensions – Front View ............................................... 23
Figure 2. Enclosure Dimensions – Side Cross Section View ....................... 23
Figure 3. Transmitter Supply Voltage Selection ............................................ 27
Figure 4. Integrated PROVU Required Connections ....................................... 27
Figure 5. PROVU Electronics Module Layout .................................................. 28
Figure 6. USB Connection ............................................................................... 28
Figure 7. Power Connections .......................................................................... 29
Figure 8. RS-485 Diagnostic LEDs .................................................................. 30
Figure 9. Three-Wire RS-485 Connection ....................................................... 30
Figure 10. Digital Input and Output Connections .......................................... 30
Figure 11. F4 Digital Input Connections ......................................................... 30
Figure 12. Relay Connections ......................................................................... 31
Figure 13. Interlock Connections .................................................................... 31
Figure 14. AC and DC Loads Protection ......................................................... 31
Figure 15. Low Voltage DC Loads Protection ................................................ 31
Figure 16. 4-20 mA Output Connections ........................................................ 32
Figure 17. Analog Output Supply Powering Other Devices .......................... 32
Figure 18. 2-Wire Transmitters Powered by Internal Supply ....................... 33
Figure 19. 3-Wire Transmitters Powered by Internal Supply ....................... 33
Figure 20. Transmitter Powered by External Supply ..................................... 33
Figure 21. Self-Powered Transmitters ............................................................ 33
Figure 22. 2-Wire Voltage Input Connections ................................................ 33
Figure 23. 3-Wire Voltage Input Connections ................................................ 33
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Introduction
The ProtEX-MAX PD8-6080 and PD8-6081
Explosion-Proof Modbus Scanners can be
programmed as a Master, Slave, or Snooper. Their
primary use is to scan and display up to 16 Modbus
registers or two 4-20 mA inputs in place of two
Modbus registers.
In Master mode, the ProtEX MAX reads up to 16
slave devices. In Snooper mode, the scanner listens
to the Modbus traffic and picks up a specific register
or registers being polled by a master device from a
specific slave device and process the data being
read. In Slave mode, the scanner is controlled by a
master device. In all modes, the data sent to the
scanner is displayed, and used to operate the relays
and 4-20 mA output.
The scanners are capable of polling up to 16 process
variables (PVs) and displaying them in sequence at a
user programmable scan rate.
A fully loaded ProtEX-MAX scanner comes with four
SPDT relays, a 4-20 mA output, two 24 VDC power
supplies, five digital inputs and four digital outputs,
and RS-485 serial communications.
Free ScanView software allows the ProtEX-MAX
Modbus Scanner to be accessed via a computer.
It can be used to configure multiple scanners,
conveniently monitor critical information, and data log
right from a PC.
SafeTouch Buttons
To make it possible to program and operate the
ProtEX-MAX in a hazardous area, the programming
buttons that are located behind the glass window can
be operated without removing the cover by using the
SafeTouch through-glass buttons. The operator puts
their finger on the glass over the button and the
button is actuated.
To learn more about SafeTouch buttons,
see this video:
predig.com/videos/Safetouch_Buttons
Ordering Information
85-265 VAC Models
Model
Standard
Features
Options
Installed
Decimal Display
PD8-6080-6H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-6H7
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-6H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-6H7
4 relays
4-20 mA output
12-24 VDC Models
Model
Standard
Features
Options
Installed
Decimal Display
PD8-6080-7H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6080-7H7
4 relays
4-20 mA output
Feet & Inches Display
PD8-6081-7H0
5 Digital Inputs,
4 Digital Outputs,
Dual Analog Inputs
No options
PD8-6081-7H7
4 relays
4-20 mA output
Accessories
Model
Description
PDA0001
3/4" M-NPT to F-M20 Reducer
PDA0002
3/4" M-NPT to 1/2" F-NPT Reducer
PDAPLUG75
3/4" Metal Conduit/Stopping Plug
PDA-SSTAG
Custom Stainless Steel Tag (see
website for convenient ordering form)
PDA6848
2" U-Bolt Kit Zinc Plated Steel
PDA6848-SS
2" U-Bolt Kit Stainless Steel
PDA7485-I
RS-232 to RS-485 isolated converter
PDA8485-I
USB to RS-485 isolated converter
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Key Features
Connections for PD8-6080-6H7, PD8-6081-6H7, PD8-6080-7H7 & PD8-6081-7H7
The Only Explosion-Proof Modbus Scanner You Will Ever Need
Front, back and in between, the PD8-6080 and PD8-6081
ProtEX-MAX Explosion-proof Modbus scanners boast
specifications, features and functionality that make
them the only hazardous area Modbus scanners you
will ever need. They can scan up to 16 process variables
made up of Modbus registers or two analog signals
such as 4-20 mA. The PD8-6080 displays in decimal
format, while the PD8-6081 has a feet & inches
display.
These Modbus scanners can be operated in Master,
Slave or Snooper modes. In Master mode, the
ProtEX-MAX reads up to 16 slave devices, scales the
data from each, displays the result, and operates the
internal relays and 4-20 mA output. As a Snooper, the
scanners listen to the Modbus traffic and pick up a
specific register or registers being polled by a master
device from a specific slave device and process the
data being read. In Slave mode, the scanner is
controlled by a master device. The data sent to the
scanner by the master is scaled, displayed, and used
to operate the relays and 4-20 mA output.
The first thing you notice about these Modbus
scanners is their modern looking, rugged, die-cast
aluminum housing with convenient mounting flanges.
Housed inside this enclosure is a dual-line, 6-digit
display with high-intensity LEDs that can be read in
direct sunlight. The main line can display numbers up
to 999,999 and the second line can be used to
indicate a tag or display the input in another scale.
The front panel push-buttons can even be operated in
a hazardous area without removing the cover by
using the SafeTouch through-glass feature.
Various math functions may be applied to the Modbus
and analog inputs as well as signal conditioning
functions such as square root extraction, programmable
exponent, or round horizontal tank calculations. The
displays, relays, and the analog outputs may be
assigned to PVs or to math channels C1, C2, C3, or
C4. All these features and capabilities can easily be
programmed without removing the cover using
SafeTouch buttons in a hazardous area or with free
ScanView PC-based software in a safe area.
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Modbus Capabilities
There are three operating modes for the Modbus
scanners:
Master
Processes data read from Modbus RTU slave
devices. It polls up to 16 process variables from 1 to
16 slave devices. The Master is capable of scanning
the selected PVs, scaling the data, triggering relays,
performing math operations, and driving the analog
outputs.
Snooper
Listens to the Modbus traffic and picks up a specific
register or registers being polled by a master device
from a specific slave device and processes the data
being read. The Snooper mode handles the data the
same way as the Master.
Slave
Processes data sent to it from a Modbus RTU master
device.
Possible applications include:
• Use Master Mode to scan the top level, interface
level, and temperature from Modbus multivariable
level transmitters.
• Use Master Mode to display the flow rate, tag,
and units, for multiple Modbus-enabled flow
meters.
• Use Snooper Mode to add a tank side indicator at
eye-level for a Modbus level transmitter being
polled by a master in the control room.
• Use Snooper Mode to add additional remote
displays to a network with a Modbus scanner
acting as the master and display the data at all
operator locations.
• Use Slave Mode to display data sent to the
scanner by a Modbus master in the control room.
Modbus Scanner Video
Learn more about the Modbus scanners in this short
video.
https://www.predig.com/videos/dD6BGcKUwuc
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Multivariable Level Transmitters Application
In this application we have a system consisting of four multivariable tank level gauges connected to a PD8-6080-6H7
displaying product level, interface level, and average temperature. The PD8-6080 is setup for Master mode, and it is
polling the Modbus transmitters.
Snooper Displaying Flow Rate from Modbus Flow Meters
In this application we have a system consisting of two Modbus enabled flowmeters connected to a SCADA system
operated out of a control room. A Modbus PLC polls the data out of the flowmeters. A PD8-6080-6H7 has been
added to the system as a Modbus Snooper, to provide the operators an easy-to-read field display near the flow lines.
The scanner displays one flow rate on the main display, and one on the second display. Each has an alternating tag
and units for clear identification.
Local Display with PD8-6080
in Snooper Mode Displaying
2 PVs Simultaneously
PLC Master in
Control Room
← Modbus RS-485 →
Modbus Flowmeter #1
Modbus Flowmeter #2
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Powerful Math Functions
The PD8-6080 & PD8-6081 use up to 16 process
variables in a variety of powerful math functions
designed for process applications. Programmable
Adder (P) and Factor (F) constants allow each
formula to be customized as needed for a specific
application. The Math Channels (C1-C4) may be
displayed in many useful combinations. Most math
functions may be applied to all PVs: for example, it is
possible to add up to 16 PVs and calculate the total
volume of all the tanks in a field. The Math2 function
allows for further calculations on the results of other
math channels (e.g. C4= C2/C1).
Name
Function
Setting
Addition
C1=(PV1+PV2+P)*F
Sunm
Difference
C1=(PV1-PV2+P)*F
diF
Absolute
Difference
C1=((Abs(PV1- PV2)+P)*F
diFAbS
Average
C1=(((PV1+PV2)/2)+P)*F
AvG
Multiplication
C1=((PV1*PV2)+P)*F
nmulti
Division
C1=((PV1/PV2)+P)*F
divide
Maximum PV
Maximum value of all selected PVs
Hi-Pv
Minimum PV
Minimum value of all selected PVs
Lo-Pv
Draw
C1=((PV1/PV2)-1)*F
drAuw
Weighted
Average
C1=((PV2-PV1)*F)+PV1
uw avg
Ratio
C1=(PV1/PV2)*F
ratio
Concentration
C1=(PV1/(PV1+PV2))*F
Concen
Resultant
Math
Channel
Math on all other math channels
nmath2
Addition
C3=(C1+C2+P)*F
Sunm
Difference
C4=(C1-C2+P)*F
diF
Absolute
Difference
C3=((Abs(C1- C2)+P)*F
diFAbS
Average
C4=(((C1+C2)/2)+P)*F
AvG
Multiplication
C3=((C1*C2)+P)*F
nmulti
Division
C4=((C1/C2)+P)*F
divide
Note: The F constant can be any value from 0.00001 to
999999. If the value is less than 1, it will have the same
effect as a divider. For example, the average could also be
derived by using (A+B)*F, where F = 0.500.
Automatic or Manual Scanning
The scanner may automatically or manually cycle
through the PVs. The scanner can be programmed to
display each PV for 1 to 99.9 seconds. The NEXT and
PREV buttons can be used to manually scan to the
next or previous PV display. The SCAN button will
pause and resume automatic scanning.
Easy Programming Methods
Given the nature of Modbus applications and the
flexibility and feature-rich capabilities of the Modbus
scanners, there is a considerable amount of
programming required to get them going. Luckily,
there is free PC-based software called ScanView that
makes it very quick and easy to program the Modbus
scanners. The scanners can also be programmed
using the through-glass SafeTouch buttons. This
makes it easy to make small changes to the setup
once the instrument is installed in the hazardous area.
Once programming is completed, it can be locked
with a password.
The ProtEX-MAX also comes preloaded with the free
ScanView programming software that connects and
installs directly to your PC with a standard USB cable,
also provided free with each instrument. This
eliminates the need to insert CDs, install drivers, or
download software from the internet. When you
connect your ProtEX-MAX to your PC, ScanView is
downloaded to your PC, the software automatically
selects the model you are programming, and you’re
ready to start programming immediately. Further
simplifying the programming process, the ProtEX-MAX
can be powered from the USB port, so no need to
apply external power while programming your meter.
In addition to programming, the software will also
allow you to monitor and datalog a ProtEX-MAX using
your PC. You can also generate and save
programming files for later use.
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
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Physical Features
The ProtEX-MAX is designed for ease-of-use in safe
and hazardous applications. The ProtEX-MAX is
housed in a rugged NEMA 4X explosion-proof
enclosure, can operate over a wide temperature
range, includes removable screw terminal connectors,
has worldwide approvals for use in hazardous areas,
and features through-glass buttons for easy scanner
operation without the need to remove the cover.
All of these features are backed by a 3-year warranty.
Super-Bright LED Display
The ProtEX-MAX features a dual-line 6-digit display
with super-bright LEDs, our brightest ever. These
allow the display to be read in any lighting condition,
even in direct sunlight.
SafeTouch Through-Glass Buttons
The ProtEX-MAX is equipped with four sensors that
operate as through-glass buttons so that it can be
programmed and operated without removing the
cover (and exposing the electronics) in a hazardous
area. These buttons can be disabled for security by
selecting the DISABLE setting on the NO-CONTACT
BUTTONS switch located on the back of the
electronics module, inside the enclosure.
Rugged, Heavy-Duty Enclosure
The ProtEX-MAX is housed in a rugged NEMA 4X, 7,
& 9, IP68 die-cast aluminum enclosure, designed to
withstand harsh environments in safe and hazardous
areas across a wide temperature range.
Wide Viewing Angle
Customers can’t always look at the display from
straight on, so the window and display module have
been optimized to provide a wide viewing angle of
approximately +/- 40°; nearly twice that of the
competition.
Built-In Mounting Flanges
The ProtEX-MAX is equipped with four slotted flanges
for wall mounting or NPS 1½" to 2½" or DN 40 to 65 mm
pipe mounting.
Flexible Mounting & Wiring
The ProtEX-MAX features four ¾" NPT threaded
conduit openings so that wiring can be routed to the
most convenient conduit connection(s). Two ¾" NPT
metal conduit plugs with 12 mm hex key fitting come
installed.
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
14
Rotatable Display
The ProtEX-MAX rotatable display, along with four
available conduit connections, provide for numerous
installation options. The display can be rotated in 90°
increments. Rotate it 90° for horizontal mounting.
Vertical Mounting Horizontal Mounting
Perfect & Secure Fit Every Time
The internal cast rails ensure the ProtEX-MAX
assembles together perfectly, quickly and securely;
and everything lines up for optimal viewing every
time. There are no standoffs to worry about breaking
or getting out of alignment. Two spring-loaded,
self-retaining, thumbscrews make the assembly a
snap, while pressing the display as close to the glass
as possible to improve wide angle viewing.
Stainless Steel Tags
PDA-SSTAG is a laser etched stainless steel tag
accessory for any of your Precision Digital meters.
The tag features custom text for equipment
identification, instruction, or whatever else is needed
in your facility. Each tag comes with a stainless steel
wire and lead seal for easy mounting wherever you
need it.
Removable Screw Terminals
Industrial applications require screw terminal
connections for easy field wiring and the ProtEX-MAX
goes one step further in convenience by making them
removable also.
Note: The above photograph is representative of the back of
the PD8-6080 and PD8-6081 in every regard except for the
signal input connector. See Figure 5 on page 28 for actual
input signal connections.
USB Port ScanView
Hazardous Area Approvals
The ProtEX-MAX's approvals allow it to be used in
hazardous areas around the world. These include: FM
Approved as Explosion-Proof / Dust-Ignition-Proof /
Flame-Proof, CSA Certified as Explosion-Proof /
Dust-Ignition-Proof, and ATEX and IECEx Certified as
Flame-Proof.
Wide Operating Temperature Range
The ProtEX-MAX can operate from -40 to 60°C
(-40 to 140°F) meaning it can be installed in a wide
variety of indoor and outdoor industrial applications.
And over this range, the ProtEX-MAX will drift no more
than 0.005% of calibrated span/°C max from 0 to 65°C
ambient and 0.01% of calibrated span/°C max from
-40 to 0°C ambient.
USB cable conveniently
plugs into side of
ProtEX-MAX meter
Page 15
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
15
Useful Tools
PD9501 Multi-Function Calibrator
This PD9501 Multi-Function Calibrator has a variety
of signal measurement and output functions, including
voltage, current, thermocouple, and RTD.
PD9502 Low-Cost Signal
Generator
The PD9502 is a low-cost, compact, simple to use
4-20 mA or 0-10 VDC signal generator. It can easily
be set for 0-20 mA, 4-20 mA, 0-10 V or 2-10 V
ranges. Signal adjustment is made with a one-turn
knob. A 15-27 VDC wall plug is provided with the
instrument. Optional USB power bank is available.
Page 16
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
16
Specifications
Except where noted all specifications apply to
operation at +25°C.
Operating Modes
Master
Processes data read from Modbus RTU
slave devices. It polls up to 16 process
variables from 1 to 16 slave devices. The
Master is capable of scanning the selected
PVs, scaling the data, triggering relays,
performing math operations, and driving
the analog outputs.
Snooper
Listens to the Modbus traffic and picks up
a specific register or registers being polled
by a master device from a specific slave
device and processes the data being read.
The Snooper mode handles the data the
same way as the Master.
Slave
Processes data sent to it from a Modbus
RTU master device.
Note: The relays and the 4-20 mA outputs are functional in
all modes.
Master & Snooper Settings
PV Number
PV1–PV16 Enable or disable the process
variables to be polled by the Master.
Slave Id
Assign the slave ID or address (1-247,
256-259 for mA or volts inputs) containing
the process variables to be displayed by
the selected PV.
Function
Code
Select which Modbus function code (03, 04,
or 65) to use in reading the slave device.
Register
Number
5 digit: 30001-39999, 40001-49999, or 1-65,536
6 digit: 300001-365536 or 400001-465536
(Function Code 65 N/A here)
Specifies which register(s) to read in the
slave device. Range is dependent on
Function Code selection (65, 04, or 03) and
digits selection (5 or 6).
Data Type
Select the data format that the slave device
uses. Select between Short integer (2 byte),
Long integer (4 byte), or floating point
(4 byte), Signed or Unsigned (integer only)
and byte order: 1234, 4321, 2143, or 3412
(big-endian vs. little-endian, or swapped).
Poll Time
1.0 to 99.9 sec. Time between
read-commands (Master mode).
Slave
Response
Timeout
0.0 to 99.9 seconds: Time allowed for the
slave to respond before the scanner
generates a communication break condition.
The master polls the slave 3 times before
starting the response timeout timer.
Slave/Snooper mode: Time the scanner will
wait for new data before going into break
condition.
Slave mode: Programming 0 disables the
timeout; the last value received will be
displayed indefinitely.
Communication Break
Displays brEAK after the Master has polled
the slave device 3 times and the response
timeout has elapsed. The Snooper and Slave
modes go into break condition after no new
data is received within the response timeout
window. Relays can be programmed to go on,
off, or ignore the break condition. The analog
outputs can be setup to generate a fixed mA
current when a break condition is detected.
PV Settings
Tag & Units
6-character, independent tag and units for
each PV and math channel
PV Format
PD8-6080 default: Decimal format
PD8-6081 default: FT & IN, 1/8th or 1/16th;
decimal format may be selected for line 2
indication.
Display
Decimal
Point
Up to five decimal places or none:
d.ddddd, dd.dddd, ddd.ddd, dddd.dd,
ddddd.d, or dddddd
Float
Decimal
Point
Select the number of decimals to use for
the floating point data expected from the
slave or master device (this is independent
from the display decimal point selection).
PV & Math
Scaling
All PVs and math channels may be scaled
to represent the input data in any
engineering unit.
Example: Level transmitter = 999.999
inches; to display in Ft-In-1/16th scale input
2 to display 83 Ft – 4 In – 0/16th.
Display Settings
Scan Mode
Automatic: 1.0 to 99.9 sec
Manual: Front panel or digital inputs
Go on alarm: Continues scanning after an
alarm is detected
Stop on alarm: Goes to the alarmed PV
and stops scanning; press Scan to resume
scanning.
Display
Scan Rate
Master/Snooper: 1 PV/second to 1 PV
every 99.9 seconds
Slave: Dependent on master device
(e.g. PLC)
Note: The display scan rate is independent
of the poll time.
Display
Assignment
Display line 1:
PV, Ch-C (math channel), PV & units,
tag & PV, tag-PV-units, Ch-C & units,
tag-Ch-C-unit, set points, max/min PV,
max/min Ch-C
Display line 2:
Same as Display Line 1; plus units, tag or
turned off
The tag and units are displayed alternately
for 2 seconds max, when selected.
Different tags & PVs may be selected to
display on line 1 & 2 at the same time
Page 17
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
17
Math Functions
Name
Math Operation (Examples)
(P = Adder, F = Factor)
Setting
Addition
(PV1+PV2+P)*F
Sunm
Difference
(PV1-PV2+P)*F
diF
Absolute
difference
((Abs(PV1- PV2)+P)*F
diFAbS
Average
(((PV1+PV2)/2)+P)*F
AvG
Multiplication
((PV1*PV2)+P)*F
Nmulti
Division
((PV1/PV2)+P)*F
divide
Max PV
Max value of all selected PVs
Hi-pv
Min PV
Min value of all selected PVs
Lo-pv
Draw
((PV1/PV2)-1)*F
drAuw
Weighted
average
((PV2-PV1)*F)+PV1
uwavg
Ratio
(PV1/PV2)*F
Ratio
Concentration
(PV1/(PV1+PV2))*F
Concen
Math 2
Math on other math channels
Nmath2
Programmable
Constants
Constant P (Adder): -99.999 to 999.999,
default: 0.000
Constant F (Factor): 0.001 to 999.999,
default: 1.000
General
Input/output
Modbus RTU over RS-485
Two analog inputs (4-20 mA, 10 V)
Display
Display Line 1: 0.60" (15 mm) high,
red LEDs
Display Line 2: 0.46" (12 mm) high,
red LEDs
6 digits each (-99999 to 999999),
with lead zero blanking
Display
Intensity
Eight user selectable intensity levels.
Default value is six.
LED Status
Indicators
See LED Status Indicators on page 34 for
details.
Overrange
Display flashes 999999
Underrange
Display flashes -99999
Programming
Methods
Four SafeTouch through-glass buttons
when cover is installed. Mechanical buttons
can be used with the cover removed. Free
PC-based USB ScanView programming
software.
Max/Min
Display
Max/min readings are stored until reset by
the user or when power to the scanner is
turned off. User can reset by front panel
pushbuttons, digital input, or via Modbus
registers.
Rounding
Select 1, 2, 5, 10, 20, 50, or 100
(e.g. rounding = 10, value = 123.45,
display = 123.50)
Password
Three programmable passwords restrict
modification of programmed settings.
Pass 1: Allows use of function keys and
digital inputs
Pass 2: Allows use of function keys, digital
inputs and editing set/reset points
Pass 3: Restricts all programming, function
keys, and digital inputs
Non-Volatile
Memory
All programmed settings are stored in
non-volatile memory for a minimum of ten
years if power is lost.
Power
Options
85-265 VAC 50/60 Hz; 90-265 VDC, 20 W max;
12-24 VDC, 12-24 VAC, 15 W max.
Powered over USB for configuration only.
Fuse
Required external fuse: UL Recognized,
5 A max, slow blow; up to 6 scanners may
share one 5 A fuse
Isolation
4 kV input/output-to-power line
500 V input-to-output or output-to-P+ supply
Overvoltage
Category
Installation Overvoltage Category II: Local
level with smaller transient overvoltages
than Installation Overvoltage Category III.
Environmental
T6 Class operating temperature range
Ta = -40 to 60°C
T5 Class operating temperature range
Ta = -40 to 65°C
Storage temperature range:
-40 to 85°C (-40 to 185°F)
Relative humidity:
0 to 90% non-condensing
Max Power
Dissipation
Maximum power dissipation limited to 15.1 W
Connections
Power, signal, relays, mA out: Removable
screw terminal blocks accept 12 to 22
AWG wire
RS-485: Removable screw terminal block
accepts 16 to 30 AWG wire
Digital I/O: Removable screw terminal
blocks accept 16 to 30 AWG wire
Enclosure
Explosion-proof die-cast aluminum with
glass window, corrosion resistant epoxy
coating, color: blue
NEMA 4X, 7, & 9, IP68
Default conduit connections: Four ¾" NPT
threaded conduit openings and two ¾"
NPT metal conduit plugs with 12 mm hex
key fitting installed. Additional conduit
opening configurations may be available;
verify quantity and sizes on specific device
labeling during installation.
Mounting
Wall Mounting:
Four (4) mounting holes provided for
mounting meter to wall. See Wall
Mounting Instructions on page 22 for
additional details.
Pipe Mounting:
Optional pipe mounting kit (PDA6848)
allows for pipe mounting. Sold separately.
See Pipe Mounting Instructions on page 24
for additional details.
Tightening
Torque
Screw terminal connectors:
5 lb-in (0.56 Nm)
Overall
Dimensions
6.42" x 7.97" x 8.47" (W x H x D)
(163 mm x 202 mm x 215 mm)
Weight
16.0 lbs (7.26 kg)
Warranty
3 years parts & labor. See Warranty
Information and Terms & Conditions on
www.predig.com for complete details.
Page 18
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
18
Serial Communications
Compatibility
EIA-485
Connectors
Removable screw terminal connector
Max Distance
3,937' (1,200 m) max
Status
Indication
Separate LEDs for Power (METER LINK),
Transmit (TX), and Receive (RX)
Scanner ID
1 – 247 (Scanner Modbus address)
Baud Rate
300 – 19,200 bps
Transmit
Time Delay
Programmable 0 to 4999 ms
This is the time the scanner will wait for a
slave to respond before sending another
request on the bus. This value should be
greater than 100 ms to avoid collisions on
the bus.
Data
8 bits (1 start bit, 1 or 2 stop bits)
Parity
Even, Odd, or None with 1 or 2 stop bits
Byte-To-Byte
Timeout
0.01 – 2.54 second
Turn Around
Delay
Less than 2 ms (fixed)
Note: Refer to the ProtEX-MAX Scanner Modbus Register
Tables located at www.predig.com for details.
Dual Process Inputs
Two Inputs
Two non-isolated analog inputs,
independent field selectable:
0-20 mA, 4-20 mA; 10 V (0-5, 1-5, 0-10 V)
Isolated
Transmitter
Power Supply
Terminals P+ & P-: 24 VDC ± 10%.
selectable for 24, 10, or 5 VDC supply
(internal jumper J4)
All models transmitter supply
rated @ 25 mA max
PV Analog
Channel ID
Ch-A mA: Assign PV to ID 256 or
Ch-A volt: 257;
Ch-B mA: Assign PV to ID 258 or
Ch-B volt: 259
Accuracy
±0.03% of calibrated span ±1 count,
square root & programmable exponent
accuracy range: 10-100% of calibrated
span
Temperature
Drift
0.005% of calibrated span/C max from
0 to 65C ambient,
0.01% of calibrated span/C max from
-40 to 0C ambient
Input Signal
Conditioning
Linear, square root, programmable
exponent, or round horizontal tank volume
calculation
Multi-Point
Linearization
2 to 32 points for PV1 and PV2
Programmable
Exponent
User selectable from 1.0001 to 2.9999 for
open channel flow
Round
Horizontal
Tank
Diameter & Length: 999.999 inch or cm
calculates volume in gallons or liters
respectively.
Low-value
Cutoff
0.1 to 999,999 (0 disables cutoff function)
for PV1 and PV2. Point below at which
display always shows zero.
Calibration
Range
Input Range
Minimum Span
Input 1 & Input 2
4-20 mA
0.15 mA
10 V
0.10 V
An error message will appear if the input 1
& input 2 signals are too close together.
Input
Impedance
Voltage ranges: greater than 500 k
Current ranges: 50 - 100 (depending on
internal resettable fuse impedance)
Input
Overload
Current input protected by an internal
resettable fuse, 30 VDC max. Fuse resets
automatically after fault is removed.
HART
Transparency
The scanner can support ONLY one HART
loop on either of the inputs. A signal
isolator is required if two HART loops are
being connected.
Under the described conditions, the
scanner does not interfere with existing
HART communications; it displays the
4-20 mA primary variable and it allows the
HART communications to pass through
without interruption. The scanner is not
affected if a HART communicator is
connected to the loop. The scanner does
not display secondary HART variables.
Page 19
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
19
Relays
Rating
4 SPDT (Form C) internal and rated 3 A
@ 30 VDC and 125/250 VAC resistive load;
1/14 HP (≈ 50 W) @ 125/250 VAC for
inductive loads
Noise
Suppression
Noise suppression is recommended for
each relay contact switching inductive
loads to prevent disruption to the
microprocessor’s operation. Recommended
suppressor value: 0.01 µF/470 , 250 VAC
(PDX6901). See Switching Inductive Loads
on page 31 for details.
Deadband
0-100% of span, user programmable
High or Low
Alarm
User may program any alarm for high or
low trip point. Unused alarm LEDs and
relays may be disabled (turn off).
Relay
Operation
• Automatic (non-latching) and/or
manual reset
• Latching (requires manual
acknowledge) with or without clear
• Pump alternation control (2-4 relays)
• Sampling (based on set point and time)
• Off (disable unused relays and enable
Interlock feature)
• Manual on/off control mode
Relay Reset
(Acknowledge)
User selectable via front panel button,
F4 digital input, external contact closure on
digital inputs, or through serial
communications.
Time Delay
0 to 999.9 seconds, on & off relay time
delays. Programmable and independent for
each relay
Fail-Safe
Operation
Programmable and independent for each
relay.
Note: Relay coil is energized in non-alarm
condition. In case of power failure, relay will
go to alarm state.
Auto
Initialization
When power is applied to the scanner,
relays will reflect the state of the input to
the scanner.
Isolated 4-20 mA Transmitter Output
Output Source
PV1-16, math channels C1-4,
set points 1-4, or manual control mode
Scaling Range
1.000 to 23.000 mA for any display range
Calibration
Factory calibrated:
4.000 to 20.000 = 4-20 mA output
Analog Out
Programming
23.000 mA maximum for all parameters:
Overrange, underrange, max, min, and
break
Communications Break
Programmable mA output when a slave
device does not reply within the response
timeout.
Accuracy
± 0.1% of span ± 0.004 mA
Temperature
Drift
0.4 µA/C max from 0 to 65C ambient,
0.8 µA/C max from -40 to 0C ambient.
Note: Analog output drift is separate from
input drift.
Isolated
Transmitter
Power Supply
Terminals I+ & R: 24 VDC 10%.
Used to power the 4-20 mA output.
All models rated @ 25 mA max.
External Loop
Power Supply
35 VDC maximum
Output Loop
Resistance
Power supply
Minimum
Maximum
24 VDC
10
700
35 VDC (external)
100
1200
Page 20
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
20
USB Connection
Function
Programming only
Connector Type
Micro-B receptacle
Cable
USB A Male to Micro-B Cable
Driver
Microsoft® Windows® XP/Vista/7/8/10
Power
USB port provides power to the
scanner.
DO NOT apply AC or DC power to the
scanner while the USB port is in use.
Digital Input (F4)
Function
Remote operation of front-panel buttons,
acknowledge/reset relays, reset max/min
values. See Function Keys & Digital I/O
Available Settings on page 79 for a
complete list of capabilities.
Contacts
3.3 VDC on contact. Connect normally
open contacts across F4 to COM.
Logic Levels
Logic High: 3 to 5 VDC
Logic Low: 0 to 1.25 VDC
Digital Inputs & Outputs
Function
Terminals provided for remote operation of
all four programming / operation buttons.
Other uses include acknowledge/reset
relays and reset max/min values. See
Function Keys & Digital I/O Available
Settings on page 79 for a complete list of
capabilities.
Channels
4 digital inputs & 4 digital outputs
Digital Input
Logic High
3 to 5 VDC
Digital Input
Logic Low
0 to 1.25 VDC
Digital Output
Logic High
3.1 to 3.3 VDC
Digital Output
Logic Low
0 to 0.4 VDC
Source
Current
10 mA maximum output current
Sink Current
1.5 mA minimum input current
+5 V Terminal
To be used as pull-up for digital inputs only.
Connect normally open push buttons
across +5 V & DI 1-4.
• DO NOT use +5 V terminal to power external
devices.
ScanView Software
Availability
Download directly from scanner or from
www.predig.com/download_software
System
Requirements
Microsoft® Windows® XP/Vista/7/8/10
Communications
USB 2.0 (for programming only)
(USB A Male to Micro-B Cable)
RS-485 to USB converter
(programming, monitoring, and data
logging)
Configuration
Configure scanners one at a time
Power
USB port provides power to the
scanner.
DO NOT apply AC or DC power to the
scanner while the USB port is in use.
Page 21
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
21
Compliance Information
Electromagnetic Compatibility
Emissions
EN 55022
Class A ITE emissions requirements
Radiated
Emissions
Class A
AC Mains
Conducted
Emissions
Class A
Immunity
EN 61326-1
Measurement, control, and laboratory
equipment
EN 61000-6-2
EMC heavy industrial generic immunity
standard
RFI - Amplitude
Modulated
80 -1000 MHz 10 V/m 80% AM (1 kHz)
1.4 - 2.0 GHz 3 V/m 80% AM (1 kHz)
2.0 - 2.7 GHz 1 V/m 80% AM (1 kHz)
Electrical Fast
Transients
±2kV AC mains, ±1kV other
Electrostatic
Discharge
±4kV contact, ±8kV air
RFI Conducted
10V, 0.15-80 MHz, 1kHz 80% AM
AC Surge
±2kV Common, ±1kV Differential
Surge
1KV (CM)
PowerFrequency
Magnetic Field
30 A/m 70%V for 0.5 period
Voltage Dips
40%V for 5 & 50 periods
70%V for 25 periods
Voltage
Interruptions
<5%V for 250 periods
Note: Testing was conducted on meters with cable shields
grounded at the point of entry representing installations
designed to optimize EMC performance.
Product Ratings and Approvals
FM
Enclosure: Type 4X; IP66
Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1, T5/T6
Class I, Zone 1, AEx d, IIC Gb T5/T6
Zone 21, AEx tb IIIC T90°C; Ta = -40°C to +65°C
T6 Ta = -40°C to +60°C; T5 Ta = -40°C to +65°C
Certificate Number: 3047283
CSA
Class I, Division 1, Groups B, C, D
Class II, Division 1, Groups E, F, G
Class III, Division 1
Class I Zone 1 Ex d IIC
Zone 21 Ex tb IIIC T90°C
-40°C < Tamb. < +60° C; Temperature Code T6
-40°C < Tamb. < +65° C; Temperature Code T5
Enclosure Type 4X & IP68
Certificate Number: 2531731
ATEX
II 2 G D
Ex d IIC T* Gb
Ex tb IIIC T90°C Db IP68
Ta = -40°C to +*°C
*T6 = -40°C to +60°C
*T5 = -40°C to +65°C
Certificate number: Sira 12ATEX1182
IECEx
Ex d IIC T* Gb
Ex tb IIIC T90°C Db IP68
Ta = -40°C to +*°C
*T6 = -40°C to +60°C
*T5 = -40°C to +65°C
Certificate Number: IECEx SIR 12.0073
Special Conditions for Safe Use:
Use suitably certified and dimensioned cable entry
device and/or plug. The equipment shall be installed
such that the supply cable is protected from
mechanical damage. The cable shall not be subjected
to tension or torque. If the cable is to be terminated
within an explosive atmosphere, then appropriate
protection of the free end of the cable shall be
provided. Cable must be suitable for 90°C.
Year of Construction
This information is contained within the serial number
with the first four digits representing the year and
month in the YYMM format.
For European Community: The ProtEX-MAX must
be installed in accordance with the ATEX directive
94/9/EC, and the product certificate Sira
12ATEX1182.
Page 22
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
22
EU Declaration of
Conformity
EU Declaration of Conformity is available in the
Documentation CD provided with the product under
the EU DoC menu.
Safety Information
• Read complete instructions prior to installation
and operation of the scanner.
• Risk of electric shock or personal injury.
• Hazardous voltages exist within enclosure.
Installation and service should be performed only
by trained service personnel.
Installation
Install in accordance with applicable local and
national regulations (e.g. NEC).
For Installation in USA
The ProtEX-MAX must be installed in accordance
with the National Electrical Code (NEC) NFPA
70.
For Installation in Canada
The ProtEX-MAX must be installed in accordance
with the Canadian Electrical Code CSA 22.1. All
power supplies below 36 V and input circuits
must be derived from a CSA Approved Class 2
source.
For European Community
The ProtEX-MAX must be installed in accordance
with the ATEX directive 94/9/EC and the product
certificate Sira 12ATEX1182.
• Disconnect from supply before opening
enclosure.
• Keep cover tight while circuits are live.
• Conduit seals must be installed within 18"
(450mm) of the enclosure or within 2" (50mm)
for Zone installations.
Wiring connectors are accessed by opening the
enclosure. To access electrical connectors,
remove the 2 captive screws and then remove
the electronics module. Connectors are on the
rear of the electronics module.
Unpacking
Remove the scanner from box. Inspect the
packaging and contents for damage. Report
damages, if any, to the carrier.
If any part is missing or the scanner malfunctions,
please contact your supplier or the factory for
assistance.
Pre-Installed Conduit Plugs
The ProtEX-MAX is supplied with two pre-installed
conduit plugs for installations that do not require the
use of all four conduit entries. The conduit/stopping
plugs include an internal hexagonal socket recess for
removal. The conduit plugs and their factory
installation are included in all hazardous area
approvals of this product.
• In hazardous areas, conduit and conduit/stopping
plugs require the application of non-setting
(solvent free) thread sealant.
It is critical that all relevant hazardous area
guidelines be followed for the installation or
replacement of conduit or plugs.
Cover Jam Screw
The cover jam screw should be properly installed
once the scanner has been wired and tested in a safe
environment. The cover jam screw is intended to
prevent the removal of the scanner cover in a
hazardous environment without the use of tools.
Using a M2 hex wrench, turn the screw clockwise until
the screw contacts the scanner. Turn the screw an
additional 1/4 to 1/2 turn to secure the cover.
• Excess torque may damage the threads, screw
head, and wrench.
Page 23
ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
Instruction Manual
23
Mounting
The ProtEX-MAX has four slotted mounting flanges
that may be used for pipe mounting or wall mounting.
Refer to Figure 1 and Figure 2 below.
• Do not attempt to loosen or remove flange bolts
while the scanner is in service.
Mounting Dimensions
All units: inches (mm)
Figure 1. Enclosure Dimensions – Front View
Figure 2. Enclosure Dimensions –
Side Cross Section View
Wall Mounting Instructions
The scanner can be mounted to any wall or flat
surface using the four provided mounting holes
located in the cast-in flanges. In addition, the internal
electronic assembly can be rotated to allow the
enclosure to be mounted in any position. To mount
the scanner to a wall, follow these instructions:
• Prepare a section of wall approximately
7" x 8.5" (178 mm x 216 mm) for scanner
mounting by marking with a pencil the
mounting holes (shown in Figure 1) on the
wall.
• Select the appropriate mounting screws for the
mounting surface to be used. The mounting
holes diameter is shown on Figure 1.
Note: Mounting screws are not included.
• Using a drill bit slightly smaller than the girth
of the mounting screws, pre-drill holes at the
mounting locations previously marked.
• Insert mounting screws into the four
mounting holes and screw them into the
pre-drilled holes.
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Pipe Mounting Instructions
The scanner can also be mounted to a pipe using an
optional U-Bolt kit. This kit includes two U-bolts, the
necessary hardware, and is available in zinc plated
steel (PDA6848) and 316 stainless steel
(PDA6848-SS).
To mount the scanner using a U-Bolt kit, follow these
instructions:
• Orient the groove on the back of the
instrument with the pipe and secure it to the
pipe with the two U-bolts and hardware
provided.
Vertical Pipe Mounting
Horizontal Pipe Mounting
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Installation Overview
We recommend the following sequence for getting the
scanner into service:
1. DO NOT apply AC or DC power to the scanner.
2. Connect the scanner to the PC with the USB cable
provided. DO NOT use a different USB cable.
3. If ScanView (SV) is already installed in your
computer, then the program will launch
automatically in most systems. If the program
does not start automatically, double-click on the
SV icon.
4. If SV is not installed, follow the instructions
provided below.
5. Use SV to configure the scanner for your
application.
6. Disconnect the USB cable from the scanner.
7. Apply power and signal and check operation of
the scanner.
8. Install the scanner and put into service.
9. Make any programming adjustments using the
programming buttons.
ScanView Software
The easiest and quickest way to program your
ProtEX-MAX scanner is to use the FREE ScanView
programming software. This software is loaded into
the scanner and connects and installs directly to your
PC with the USB cable provided. DO NOT use a
different USB cable. We recommend that the first
thing you do after taking the scanner out of the box is
connect the ProtEX-MAX to your PC with the provided
USB cable. DO NOT apply AC or DC power to the
scanner while your PC is connected to the scanner as
it will disrupt the USB connection. It is not necessary
to apply an input signal.
ScanView programming software is intuitive, and
most customers can get their scanner programmed as
they like without even looking in the manual.
For more information on ScanView visit
www.predig.com/ScanView
ScanView Installation
1. Connect one end of the provided USB cable
to the scanner and the other end to the
computer. The computer will automatically
install the driver software it needs to talk to
the scanner. Follow the on-screen
instructions and allow sufficient time for the
process to complete. This can take a few
minutes. If the process is interrupted, then it
could leave the system in an unstable
condition.
• Only one scanner may be connected at a time.
Attaching multiple scanners will cause a conflict
with the scanner software.
• DO NOT apply AC or DC power to the scanner
when using the USB connection.
• The meter should only be connected to a
computer while it is located in a safe area.
2. Once the driver is installed, an AutoPlay
dialog should appear for the drive
“MAINSTAL.” Click “Open folder to view
files.”
If the computer does not display an AutoPlay
dialog for the drive “MAINSTAL,” you should
open My Computer and double-click on the
drive labeled “MAINSTAL.”
3. Double-click on the file named “MSStart.”
The program will open a few windows and
install two programs on your computer.
Simply follow the on-screen instructions until
you see one of the dialogs below. If you
receive a “User Account Control” warning,
click “Yes.”
4. If there is an update available, click the
“Update” button to install the new version.
Otherwise, click “Configure” to begin
programming your scanner.
Note: If you decide to update your ScanView software,
once the installation has completed, you will be asked if
you want to update the setup files located on the scanner
itself. This way, you will always have the most current
version on the scanner for future installs.
• DO NOT unplug the scanner while the new
installation files are being written to it. The
scanner will display uwrite during the process
and you will receive an on-screen notification
once the process is complete.
• Do not disconnect and reconnect the scanner
rapidly. Allow at least 10 seconds from
disconnection before reconnecting USB to the
scanner.
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ScanView Monitoring
Once the scanner has been configured, the user
chooses Monitor from the top menu bar. The Monitor
window will appear; the enabled PVs and all
associated values will take a few seconds to display.
The PVs will display as configured - either in Decimal
or Feet & Inches format. Data Logging, Scanning, and
Alarm Status can all be viewed at the bottom of the
Monitor window.
ScanView Data Logging
ScanView software allows the user to log data and
generate reports.
1. Select Monitor - Stop Scan from the top
menu bar.
2. Select the Data Log drop-down menu from
the top menu bar. Parameters for Data
Logging are: Interval, Units, Log File Name,
and Start/Pause. For Interval the choices
are: 1-60, and for Unit choices for logging
data are: Seconds, Minutes, and Hours.
3. Save the Data Log File. It is recommended
to name the file using a unique name and
the date, such as:
"ScanView_1.00_Log_X_100813".
4. Select Monitor - Start Scan from the top
menu bar, then select Data Log - Start from
the top menu bar. The log file can be
retrieved at any time by following the path:
(C:) - Program Files (x86) - PDC ScanView 1.00 - Data Log.
• Once Data Logging has begun, the Configure,
Customize, and Connection screens cannot be
accessed until the user has paused Data
Logging.
Data Log files are saved in the Data Log folder as
".CSV" files. To view Data Log files, the user must first
pause both Scanning and Data Logging. Data
Logging & Scan Status can be seen at the bottom of
the Monitor window.
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Transmitter Supply Voltage Selection (P+, P-)
All scanners, including models equipped with the
12-24 VDC power option, are shipped from the factory
configured to provide 24 VDC power for the
transmitter or sensor.
If the transmitter requires 5 or 10 VDC excitation, the
internal jumper J4 must be configured accordingly.
To access the voltage selection jumper:
1. Remove all the wiring connectors.
2. Unscrew the back cover.
3. Slide out the back cover by about 1 inch.
4. Configure the J4 jumper, located behind the
input signal connector, for the desired
excitation voltage as shown.
Figure 3. Transmitter Supply Voltage Selection
Connections
All connections are made to removable screw
terminal connectors located at the rear of the
meter.
• Use copper wire with 60°C or 60/75°C insulation
for all line voltage connections. Observe all safety
regulations. Electrical wiring should be performed
in accordance with all applicable national, state,
and local codes to prevent damage to the meter
and ensure personnel safety.
• Observe all safety regulations. Electrical wiring
should be performed in accordance with all
agency requirements and applicable national,
state, and local codes to prevent damage to the
meter and ensure personnel safety.
• Static electricity can damage sensitive
components.
• Observe safe handling precautions for
static-sensitive components.
• Use proper grounding procedures/codes.
• If the instrument is installed in a high voltage
environment and a fault or installation error
occurs, high voltage may be present on any lead
or terminal.
• Follow all fusing and wiring precautions
requirements for the instrument integrated to the
PD8 Series model number being connected.
To access the connectors, remove the enclosure
cover and unscrew the two captive screws that fasten
the electronics module. Signal connections are made
to de-pluggable connectors on the back of the
electronics module.
Some connectors may be provided already
connected. These connections are required for proper
operation of the ProtEX-MAX and should not be
removed unless instructed to by this manual.
Wires marked as being used for testing purposes
should be removed.
Grounding connections are made to the two ground
screws provided on the base – one internal and one
external.
After all connections have been completed and
verified, apply power to the unit.
Required & Factory Wired Connection
The ProtEX-MAX comes with a pre-wired connection.
This connection is detailed below and must be
maintained in order for the instrument to function
properly.
Figure 4. Integrated PROVU Required Connections
MAIN BOARD
INPUT
SIGNAL
J4
5 V
10 V
24 V
J4 CONFIGURATION
Factory Default
P+
P-
mA+
COM
V+
F4
mA+
COM
V+
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PROVU Electronics Module Layout for PD8-6080/81-6H7 and PD8-6080/81-7H7*
* For models PD8-6080/81-6H0 and PD8-6080/81-7H0 the upper set of connectors (RELAYs & MA OUT) are not present
Figure 5. PROVU Electronics Module Layout
USB Connection
Figure 6. USB Connection
• DO NOT disconnect the RJ45 M-LINK connector cable. Otherwise the instrument will not function properly.
• The meter should only be connected to a computer while it is located in a safe area.
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Power Connections
Power connections are made to a two-terminal
connector labeled POWER on the back of the scanner.
The scanner will operate regardless of DC polarity
connection. The + and - symbols are only a suggested
wiring convention. There are separate models for low
voltage and high voltage power. See Ordering
Information on page 8 for details.
Figure 7. Power Connections
AC or DC
POWER
Required External Fuse:
5 A max, 250 V Slow Blow
POWER
+
-
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RS-485 Connections
The RS-485 connections are made to a five terminal
connector used for Modbus RTU serial
communications. The RS-485 terminals include
Transmit Data (DO) and (/DO), Receive Data (DI) and
(/DI), and Signal Ground. See Serial Communications
(serial) on page 41 for more information.
There are three diagnostic LEDs: Transmit Data (TX),
Receive Data (RX) and Power (METER LINK) to
show when the meter is transmitting and receiving
data from other devices.
Figure 8. RS-485 Diagnostic LEDs
RS-485 Multi-Drop Connection
When using more than one scanner in a multi-drop
mode, each scanner must be provided with its own
unique address. The scanner address (Slave ID) can
be programmed between 1 and 247. The transmit
delay can be set between 0 and 199 ms. The parity
can be set to even, odd, or none with 1 or 2 stop bits.
To change the scanner address:
1. Press and hold the Menu button for three seconds
to access Advanced Features menu of the scanner.
2. Press Up arrow until Serial (SEriaL) menu is
displayed and press Enter, Addres is displayed.
3. Press Enter to change scanner address using Right
and Up arrow buttons. Press Enter to accept.
4. Press Menu button to exit and return to Run Mode.
Three-Wire Connection
In order to wire the five pins for use as a three-wire
half-duplex RS-485 connection, it is necessary to
create a jumper connection between DI to DO and /DI
to /DO- as shown below.
Figure 9. Three-Wire RS-485 Connection
Digital I/O Connections
Digital inputs and outputs are provided in order to
expand the functionality of the scanner. Digital input
connections are made via a push button or switch to
the appropriate digital input terminal and the +5 VDC
terminal. Digital output connections are made by
wiring from the appropriate digital output terminal to
the ground terminal.
Figure 10. Digital Input and Output Connections
The onboard digital inputs (1-4) are configured at the
factory to function identically to the front panel
pushbuttons (Menu, F1, F2, & F3) in order to work
with the SafeTouch buttons. Changing the
programming of the digital inputs will affect the
function of the SafeTouch buttons.
If you wish to change the behavior of the digital
inputs, re-assign F1-F3 to the desired function, then
change the corresponding digital input to match.
• DO NOT disconnect the RJ45 M-LINK connector
cable. Otherwise the instrument will not function
properly.
F4 Digital Input Connections
A digital input, F4, is standard on the scanner. This
digital input connected with a normally open contact
across F4 and COM, or with an active low signal
applied to F4. It can be used for remote operation of
front-panel buttons, to acknowledge/reset relays, or to
reset max/min values. See Function Keys & Digital
I/O Available Settings on page 79 for a complete list
of capabilities.
Figure 11. F4 Digital Input Connections
__ __
DI DI DO DO
1 2 3 4 5 6
+5 I1 I2 I3 I4 O1
7 8
O2 O3
9 10
O4 G
DI 1-4 DO 1-4
5 VDC GND
EXC T+ COM
123
COM
12
F4
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Relay Connections
Relay connections are made to two six-terminal
connectors labeled RELAY1 – RELAY4. Each relay’s
C terminal is common only to the normally open (NO)
and normally closed (NC) contacts of the
corresponding relay. The relays’ C terminals should
not be confused with the COM (common) terminal of
the INPUT SIGNAL connector.
Figure 12. Relay Connections
Interlock Relay Feature
As the name implies, the interlock relay feature
reassigns one, or more, alarm/control relays for use
as interlock relay(s). Interlock contact(s) are wired to
digital input(s) and trigger the interlock relay. This
feature is enabled by configuring the relay, and the
corresponding digital input(s). See Setting Up the
Interlock Relay (Force On) Feature on page 63.
In the example below, an Interlock Contact switch is
connected to a digital input, which will be used to
force on (energize) the Interlock Relay. The Interlock
Relay and the Control Relay are connected in series
with the load.
• When the Interlock Contact is closed (safe), the
Interlock Relay energizes, allowing power to flow
to the Control Relay; the corresponding front
panel LED is on.
• When the Interlock Contact is open, the
corresponding front panel LED flashes (locked
out), the Interlock Relay is de-energized,
preventing power from flowing to the Control
Relay and the load.
Figure 13. Interlock Connections
Switching Inductive Loads
The use of snubbers to suppress electrical noise is
strongly recommended when switching inductive
loads to prevent disrupting the microprocessor’s
operation. The snubbers also prolong the life of the
relay contacts. Suppression can be obtained with
resistor-capacitor (RC) networks assembled by the
user or purchased as complete assemblies. Refer to
the following circuits for RC network assembly and
installation:
Figure 14. AC and DC Loads Protection
Choose R and C as follows:
R: 0.5 to 1 Ω for each volt across the contacts
C: 0.5 to 1 µF for each amp through closed contacts
Notes:
1. Use capacitors rated for 250 VAC.
2. RC networks may affect load release time of solenoid
loads. Check to confirm proper operation.
3. Install the RC network at the scanner's relay screw
terminals. An RC network may also be installed across
the load. Experiment for best results.
Use a diode with a reverse breakdown voltage two to three
times the circuit voltage and forward current at least as large
as the load current.
Figure 15. Low Voltage DC Loads Protection
RC Networks (Snubbers) Available from Precision Digital
RC networks are available from Precision Digital and
should be applied to each relay contact switching an
inductive load. Part number: PDX6901.
Note: Relays are de-rated to 1/14 HP (50 watts) with an
inductive load.
C NONO NC NC C
RELAY4 RELAY3
4 36 5 2 1
C NONO NC NC C
RELAY2 RELAY1
4 36 5 2 1
C
R
C
R
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4-20 mA Output Connections
Connections for the 4-20 mA transmitter output are
made to the connector terminals labeled mA OUT.
The 4-20 mA output may be powered internally or
from an external power supply.
Figure 16. 4-20 mA Output Connections
Analog Output Power Supply
The internal 24 VDC power supply powering the
analog output may be used to power other devices if
the analog output is not used. The I+ terminal is the
+24 V and the R terminal is the return.
Figure 17. Analog Output Supply Powering Other
Devices
Remote Programming
The scanner can be operated via the programming
buttons or a remote control station with required
approvals to be located in a hazardous area using the
digital inputs and outputs.
4-20 mA Input
Remote Display, PLC,
Chart Recorder, Etc.
-
+
RI- I+
132
RELAY1
mA OUT
24 V
12-35 VDC
Power
Supply
+
4-20 mA
Input Meter
-+
RI- I+
132
RELAY1
321
-
24 V
mA OUT
Internal Power Supply
and Analog Output
321
Active Output Loop Passive Output Loop
RI- I+
132
24 VDC
Powered
Device
24 V
+-
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Analog Input Signal Connections
Analog input signal connections are made to a
nine-terminal connector labeled SIGNAL. The COM
(common) terminals are the return for the 4-20 mA
and the 10 V input signals. The two COM terminals
connect to the same common return and are not
isolated.
Current (mA) Connections
The following figures show examples of current
connections. There are no switches or jumpers to set
up for current inputs. Setup and programming is
performed through the programming buttons or using
ScanView software.
Figure 18. 2-Wire Transmitters
Powered by Internal Supply
Figure 19. 3-Wire Transmitters
Powered by Internal Supply
Figure 20. Transmitter
Powered by External Supply
Figure 21. Self-Powered Transmitters
The current input is protected against current
overload by a resettable fuse. The display may or
may not show a fault condition depending on the
nature of the overload.
The fuse limits the current to a safe level when it
detects a fault condition, and automatically resets
itself when the fault condition is removed.
Voltage (V) Connections
The following figures show examples of voltage
connections.
There are no switches or jumpers to set up for voltage
inputs. Setup and programming is performed through
the programming buttons or ScanView software.
Figure 22. 2-Wire Voltage Input Connections
Figure 23. 3-Wire Voltage Input Connections
The scanner is capable of accepting any voltage from
-10 VDC to +10 VDC.
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Setup and Programming
There is no need to recalibrate the scanner when first received from the factory.
The scanner is factory calibrated prior to shipment for milliamps and volts with
calibration equipment that is certified to NIST standards.
Overview
There are no jumpers involved in the scanner setup procedure.
Setup and programming is done using ScanView software or through the programming buttons.
After power and signal connections have been completed and verified, apply power to the scanner.
LED Status Indicators
PD8-6080
LED
State
Indication
1-4
Steady
Alarm condition based on set and reset points, independent of relay
status in certain configurations. (Available on all meter
configurations, including those without relays installed)
1-4
Flashing
Relay interlock switch open
1-4 & M
Flashing
Relay in manual control mode
F
Flashing
Communications fault condition
Flashing
Press SCAN to pause scanning
Steady
Press SCAN to resume scanning
Flashing
Stop scan on alarm
M
Flashing
Analog output in manual control mode
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PD8-6081
LED
State
Indication
1-4
Steady
Alarm condition based on set and reset points, independent of relay
status in certain configurations. (Available on all meter
configurations, including those without relays installed)
1-4
Flashing
Relay interlock switch open
1-4 & M
Flashing
Relay in manual control mode
8
Steady
Eighths of an inch
16
Steady
Sixteenths of an inch
F
Flashing
Communications fault condition
Flashing
Press SCAN to pause scanning
Steady
Press SCAN to resume scanning
Flashing
Stop scan on alarm
M
Flashing
Analog output in manual control mode
Symbol
Description
FT
Feet value
IN
Inches value
- -
Designation separators
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Programming Buttons
Button Symbol
Description
Press to enter, exit Programming Mode, or exit
max/min readings
Press to move to the previous PV or math channel
Press to move to the next PV or math channel
Press once to pause scanning, press again to
resume scanning
• Press the Menu button to enter or exit the Programming Mode at any time.
• Press the Right arrow button to move to the next digit during digit or decimal point programming.
• Press or hold the Up arrow button to scroll through the menus, decimal point, or to increment the value of a digit.
• Press the Enter button to access a menu or to accept a setting.
• Press and hold the Menu button for three seconds to access the advanced features of the meter.
SafeTouch Buttons
The ProtEX-MAX is equipped with four sensors that
operate as through-glass buttons so that it can be
programmed and operated without removing the cover
(and exposing the electronics) in a hazardous area.
These buttons can be disabled for security by
selecting DISABLE on the switch labeled NO-CONTACT
BUTTONS located on the connector board.
To actuate a button, press one finger to the glass
directly over the marked button area. Then retract
finger more than three inches from the glass before
pressing the next button. When the cover is removed,
the four mechanical buttons located next to the
sensors are used. The sensors are disabled when a
mechanical button is pressed and will automatically
be re-enabled after 60 seconds of inactivity.
The SafeTouch Buttons are designed to filter normal
levels of ambient interference and to protect against
false triggering, however, it is recommended that the
SafeTouch Buttons be disabled (slide switch to
DISABLE) if there is an infrared interference source in
line-of-sight to the display.
The SafeTouch Buttons are configured by default to
duplicate the function of the front panel mechanical
pushbuttons associated with the integrated meter.
The symbols by each SafeTouch button correspond
to a mechanical button as shown in the above table.
SafeTouch Button Tips:
• To the extent possible, install the display facing
away from sunlight, windows, reflective objects
and any sources of infrared interference.
• Keep the glass window clean.
• Tighten the cover securely.
• Use a password to prevent tampering.
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Display Functions & Messages
The following table shows the main menu functions
and messages in the order they appear in the menu.
Display Functions & Messages
Display
Parameter
Action/Setting
Description
nmode
Mode
Enter Mode menu
nmaster
Master
Enter Master Mode
PV.nbr
PV Number
Select PV
PV 1
PV
Select PV 1-16
enable
Enable
Enable PV
disabl
Disable
Disable PV
SlaV.Id
Slave ID
Enter the unique Slave
ID for each PV
FunCod
Function
Code
Enter the Function Code
for each PV
Fun 03
Function
Code 03
Use Function Code 03 to
read slave device
Fun 04
Function
Code 04
Use Function Code 04 to
read slave device
Fun 65
Function
Code 65
Use Function Code 65 to
read slave device
Reg.nbr
Register
Number
Enter the Register
Number for each PV
5 dig
6 dig
Register
Number Digits
Select either 5 (x0001x9999) or 6 (x00001x65536) digits
data
Data Type
Enter the Data Type for
each PV
float
Floating Point
Data Type
Floating Point Data
Type. Select Floating
Point as the data type to
be read from the slave
device.
short
Short Integer
Data Type
Short Integer Data Type.
Select Short Integer as
the data type to be read
from the slave device.
long
Long Integer
Data Type
Long Integer Data Type.
Select Long Integer as
the data type to be read
from the slave device.
binary
Binary
Binary Data format.
Select Binary format for
Short or Long integers.
bcd
BCD
BCD Data format. Select
BCD format for Short or
Long integers.
signed
Signed
Signed Data. Select
Signed Binary format for
Short or Long integers.
unsigd
Unsigned
Unsigned Data. Select
Unsigned Binary format
for Short or Long
integers.
1234
Byte Order
Select big-endian byte
order.
4321
Byte Order
Select little-endian byte
order.
2143
Byte Order
Select byte-swapped
big-endian byte order.
Not available for Short
integer.
Display Functions & Messages
Display
Parameter
Action/Setting
Description
3412
Byte Order
Select byte-swapped
little-endian byte order.
Not available for Short
integer.
t-poll
Polling Time
Enter Polling Time (the
time between read
commands). In other
words, how often the
display is updated in
Master mode.
t-resp
Response
Time
Enter the time allowed
for a slave device to
respond to a command.
snooper
Snooper
Enter Snooper Mode
Pv.nbr
PV Number
Select PV
PV 1
PV
Select PV 1-16
enable
Enable
Enable PV
disabl
Disable
Disable PV
Slav.Id
Slave ID
Enter the unique Slave
ID of the device to be
polled by Master
FunCod
Function
Code
Enter the Function Code
for each PV
Fun 03
Function
Code 03
Use Function Code 03 to
read slave device
Fun 04
Function
Code 04
Use Function Code 04 to
read slave device
Fun 65
Function
Code 65
Use Function Code 65 to
read slave device
Reg.nbr
Register
Number
Enter the Register
Number for each PV
5 dig
6 dig
Register
Number Digits
Select either 5 (x0001x9999) or 6 (x00001x65536) digits
data
Data Type
Enter the Data Type for
each PV
float
Floating Point
Data Type
Floating Point Data
Type. Select Floating
Point as the data type to
be read from the slave
device.
short
Short Integer
Data Type
Short Integer Data Type.
Select Short Integer as
the data type to be read
from the slave device.
long
Long Integer
Data Type
Long Integer Data Type.
Select Long Integer as
the data type to be read
from the slave device.
binary
Binary
Binary Data. Select
Binary format for Short
or Long integers.
bcd
BCD
BCD Data. Select BCD
format for Short or Long
integers.
signed
Signed
Signed Data. Select
Signed Binary format for
Short or Long integers.
unsigd
Unsigned
Unsigned Data. Select
Unsigned Binary format
for Short or Long
integers.
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Display Functions & Messages
Display
Parameter
Action/Setting
Description
1234
Byte Order
Select big-endian byte
order.
4321
Byte Order
Select little-endian byte
order.
2143
Byte Order
Select byte-swapped
big-endian byte order.
Not available for Short.
3412
Byte Order
Select byte-swapped
little-endian byte order.
Not available for Short.
t-resp
Response
Time
Enter the time allowed
for a slave device to
respond to a command.
slaVe
Slave
Enter Slave Mode
data
Data Type
Enter the Data Type for
each PV
float
Floating
Point Data
Type
Floating Point Data
Type. Select Floating
Point as the data type to
be read from the slave
device.
short
Short
Integer Data
Type
Short Integer Data Type.
Select Short Integer as
the data type to be read
from the slave device.
long
Long
Integer Data
Type
Long Integer Data Type.
Select Long Integer as
the data type to be read
from the slave device.
binary
Binary
Binary Data. Select
Binary format for Short
or Long integers.
bcd
BCD
BCD Data. Select BCD
format for Short or Long
integers.
signed
Signed
Signed Data. Select
Signed Binary format for
Short or Long integers.
unsigd
Unsigned
Unsigned Data. Select
Unsigned Binary format
for Short or Long
integers.
1234
Byte Order
Select big-endian byte
order.
4321
Byte Order
Select little-endian byte
order.
2143
Byte Order
Select byte-swapped
big-endian byte order.
Not available for Short
integer.
3412
Byte Order
Select byte-swapped
little-endian byte order.
Not available for Short
integer.
t-resp
Response
Time
Enter the time allowed
for a slave device to
respond to a command.
setup
Setup
Enter Setup menu
pV
Process
Variable
Enter PV Setup menu
PV 1
PV
Select PV 1-16
tag
Tag
Tag
Display Functions & Messages
Display
Parameter
Action/Setting
Description
units
Units
Units
fornmt
Format
Format (Decimal,
Eighths, or Sixteenths of
an Inch)
dec
Decimal
Decimal Format
Ft In 8
Eighths
Eighth Inch Format
Ft In 16
Sixteenths
Sixteenth Inch Format
Dec.Pt
Decimal
Point
Decimal Point menu
Disp.dp
Display
Decimal
Point
Set the decimal point
position for the display.
This is independent from
float decimal point.
flot.dp
Floating
Decimal
Point
Floating Decimal Point.
Select the decimal point
for the expected floating
point data.
SCale
Scale PV
Scale PV
Inp 1
Input 1
Scale input 1 signal or
program input 1 value
Dis 1
Display 1
Program display 1 value
Inp 2
Input 2
Scale input 2 signal or
program input 2 value
(up to 32 points)
Dis 2
Display 2
Program display 2 value
(up to 32 points)
dsplay
Display
Enter Display Setup
menu
Line 1
Display
Line 1
Top Display
D pV
Display PV
Display PVs 1-16
D Ch-C
Display C
Channel
Display Math Channels
C1-C4
PV.unit
Display PV
& Units
Display PV & Units
Tg.pVn
Display Tag,
PV Number
Display Tag & PV
Number selected
Tg.pVn.u
Display Tag,
PV# & Units
Display Tag, PV
Number selected, &
Units
C.unit
Display C &
Units
Display C1-C4 & Units
Tg. C. u
Display Tag,
C, & Units
Display Tag, C1-C4 &
Units
Dset 1
Display Set
Points 1-4
Display Set Points 1-4
Hi-pV
Display Max
PV 1-16
Display Maximum value
for each enabled PV116
Lo-pV
Display Min
PV 1-16
Display Minimum value
for each enabled PV116
Hi-C
Display Max
Ch C1-C4
Display Maximum for
math channels C1-C4
Lo-C
Display Min
Ch C1-C4
Display Minimum for
math channels C1-C4
Line 2
Display
Line 2
Bottom Display
D tag
Display Tag
Display Tag
D tag.u
Display Tag
& Units
Display Tag & Units
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Display Functions & Messages
Display
Parameter
Action/Setting
Description
D off
Display off
Display Off
d-Inty
Display
Intensity
Display Intensity
relay
Relay Setup
Enter Relay Setup menu
assign
Assign
Relay
Assign Relay menu
Relay 1
Relay 1-4
Assign Relay 1-4
PV 1
PV 1-16
Map Relay to PV 1-16
nm-pV
Multiple PVs
Map Relay to Multiple
PVs
Rly 1
Relay 1-4
Relay 1-4
act 1
Relay
Action 1-4
Assign Relay Action for
relays 1-4
Auto
Automatic
Set relay for automatic
reset
A-nman
Automanual
Set relay for auto or
manual reset any time
LatCH
Latching
Set relay for latching
operation
Lt-CLr
Latchingcleared
Set relay for latching
operation with manual
reset only after alarm
condition has cleared
Altern
Alternate
Set relay for pump
alternation control
SAnmpl
Sample
Set relay for sample
time trigger control
Off
Off
Turn relay off
FaiLSF
Fail-safe
Enter Fail-safe menu
FLS 1
Fail-safe 1
Set relay 1-4 fail-safe
operation
on
On
Enable fail-safe
operation
off
Off
Disable fail-safe
operation
DeLAY
Delay
Enter relay Time Delay
menu
DLY 1*
Delay 1*
*Enter relay 1-4 time
delay setup
On 1
On 1
Set relay 1 On time
delay
OFF 1
Off 1
Set relay 1 Off time
delay
break
Break
Set relay condition if
communication break
detected
No act
No action
Ignore break condition.
No change in relay state
when Communications
Break detected.
On
On
Relay goes to alarm
condition when break
detected. Relay turns on
when Communications
Break detected.
Off
Off
Relay goes to non-alarm
condition when break
detected. Relay turns off
when Communications
Break detected.
Display Functions & Messages
Display
Parameter
Action/Setting
Description
Aout
Analog
output
Enter the Analog Output
scaling menu
AOut 1*
Aout
channel
Analog Output source
channel
Dis 1
Display 1
Program the first Display
value for the Analog
Output.
Out 1
Output 1
Program the first Output
value that corresponds
to the Display 1 value
for the Analog Output.
(e.g. 4.000 mA).
Dis 2
Display 2
Program the second
Display value for the
Analog Output.
Out 2
Output 2
Program the second
Output value that
corresponds to the
Display 2 value for the
Analog Output. (e.g.
4.000 mA). (e.g. 20.000
mA)
serial
Serial
Enter Serial menu
Scan.ID
Scan ID
Enter Scan ID of the
meter being polled
(1-247)
baud
Baud Rate
Select Baud Rate
(Choices:
300/600/1200/2400/480
0/9600/19,200)
(Must match that of
other devices)
Tr dly
Transmit
Delay
Enter Transmit Delay
(Master’s delay must be
greater than Snooper or
slave devices)
parity
Parity
Select Parity (Even,
Odd, None 1-Stop, or
None 2-Stop)
(Must match that of
other devices)
t-byt
Byte-to-byte
Timeout
Enter the timeout value
allowed between
received bytes.
(This is used to fix
communication
problems with slow
devices).
pass
Password
Enter the Password
menu
Pass 1
Password 1
Set or enter Password 1
Pass 2
Password 2
Set or enter Password 2
Pass 3
Password 3
Set or enter Password 3
unloc
Unlocked
Program password to
lock scanner
locd
Locked
Enter password to
unlock scanner
999999
-99999
Flashing
Over/under range
condition
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Menu Navigation Tip
• The Up arrow scrolls through the sub-menus
within a menu, after the last item it returns to the
top menu. Press Enter to step into the menu
again or press Up arrow to move to the next menu.
Note: There are some exceptions
(e.g. PV - Enable - - Data type ▲ Next PV).
• Press Menu to exit programming at any time.
Setting Numeric Values
The numeric values are set using the Right and Up
arrow buttons. Press the Right arrow to select the
next digit and the Up arrow to increment the digit’s
value. The digit being changed is displayed brighter
than the rest. Press and hold the Up arrow to
auto-increment the display value. Press the Enter
button, at any time, to accept a setting or the Menu
button to exit without saving changes.
Main Menu
The main menu consists of the most commonly used
functions: Mode, Setup, Serial, and Password.
• Press Menu button to enter Scanner
Programming
• Press Up arrow button to scroll through the
menus
• Press Menu, at any time, to exit and return to
Run Mode
• Changes to the settings are saved to memory
only after pressing Enter
• The display moves to the next menu every time a
setting is accepted by pressing Enter
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Serial Communications (serial)
The scanner is equipped with RS-485 Modbus RTU
serial communications.
The Serial menu is used for programming the
Scanner ID, Baud Rate, Transmit Delay, Parity, and
Byte-to-Byte Timeout parameters.
The scanner may be connected to a PC for initial
configuration via the on-board USB connection. For
ongoing digital communications with a computer or
other data terminal equipment, use the RS-485
connection with the appropriate serial converter; see
Ordering Information on page 8 for details.
• DO NOT connect any equipment to the RJ45
M-LINK connector. Otherwise damage will occur
to the equipment and the meter.
• DO NOT disconnect the RJ45 connector located
to the left of the power terminal block. Doing so
will disable the on-board digital I/O, and the
RS-485 serial communications.
When using more than one scanner in a multi-drop
mode, each scanner must be provided with its own
unique address. The scanner address (Scan ID) may
be programmed between 1 and 247.
The transmit delay may be set between 0 and 4999 ms;
this value must be less than (Poll Time/# of PVs).
The parity can be set to even, odd, or none with 1 or 2
stop bits.
When setting up the scanner to run on a Modbus
system, the devices must be programmed with
matching Baud Rate and Parity. Failure to match up
the network devices’ parameters may result in
communication breaks.
Notes:
1. The byte-to-byte timeout setting may be adjusted to fix
communication errors with slow devices.
2. The Transmit Delay of the Master must be greater than
the Snooper or the slave devices being polled.
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Scanner Mode Selection
Operating Modes (nmode)
The Mode menu is used to select how the scanner is
to function:
1. Master: Reads a slave device, scales the data
from it, displays the result, and operates the
relays and 4-20 mA output. The Master polls from
1 to 16 process variables from 1 to 16 slave
devices. The Master processes and displays PV1
through PV16 and alternately displays the
variables being polled.
2. Snooper: Listens to the Modbus traffic and picks
up a specific register or registers being polled by
a Master device from a specific slave device and
processes the data being read.
3. Slave: Read and controlled by a master device
(PLC, DCS, etc). The data sent to it by the
master is scaled, displayed, and used to operate
the relays and 4-20 mA output.
The Master mode requires additional parameter
selection to specify how the slave device is to be read
and how to interpret the data.
Press Menu to enter Scanner Programming. Press
the Enter button to access any menu or press Up
arrow button to scroll through choices. Press the
Menu button to exit at any time and return to Run
mode.
How to Enable Process Variables (PVs)
In Master or Snooper Mode, navigate to the PV
Number menu and press ENTER. From there, the
user can scroll through all of the sixteen available
PVs. In order to enable a specific PV, simply press
ENTER to access the desired PV, then scroll to
ENABLE and press ENTER (Follow the same course
of action for disabling PVs).
Enter the Slave ID of the device being polled by the
Master, followed by the Function Code, Register
Number, Data Type, and Byte Order. Analog input
channels must be assigned a Slave ID corresponding
to the input to be read as indicated here:
• Ch A = 256 (mA) or 257 (V)
• Ch B = 258 (mA) or 259 (V)
Once the desired PVs are enabled, navigate to the
Setup menu and enter the PV Setup in order to select
the PV tag, units, format, and decimal point
parameters, as well as to scale the PVs.
Once the user has scaled the final PV, the scanner
automatically goes to the Display Setup menu to
access line 1 and 2 display assignments.
By default, display line 1 is assigned to Display PV
(d pV) and line 2 to display the Tag (d tag) for the
corresponding PV.
It is possible to display PVs & Tags on line 1 and 2
simultaneously by selecting Tag & PV Number
(tag.pVn). Display line 1 is setup by default to display
PV & tag for PV1, 3, 5, 7; while line 2 is setup by
default to display PV & tag 2, 4, 6, 8. These can be
changed by the user to display any or all PVs.
Program either display line 1 or 2 to show the desired
parameters and press ENTER. See Setting Up the
Displays (dsplay setup) on page 49 for details.
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Master Mode (nmastr)
The Master mode contains the PV Number, Poll Time, and Response Timeout menus.
PV Number: Enable/disable PVs, select slave ID, function code, register number, data type & byte order.
Poll Time: Enter the time interval to poll the slave devices selected.
Response timeout: Enter the time interval to wait after three polls before reporting it as a Communications Break.
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Snooper Mode (Snoopr)
The Snooper mode is used to listen to data being transmitted on the bus. Multiple Snoopers can be connected to the
RS-485 bus and display any process variable. The same process variable can be displayed in multiple locations. Use
the menu below to configure Snooper Mode parameters.
Notes:
1. To minimize the possibility of communication errors and communication break conditions, use a poll time of 5 seconds or more
with slow baud rates (e.g. 4800 bps or less).
2. The response time for scanners set up for Snooper mode must be greater than the Master’s poll time. This setting corresponds
to the time window during which the Snooper listens to the bus for a reply by the slave device being polled by the master
device. As soon as the Snooper detects a new reply on the bus, the display is updated. If there is no reply within the response
time setting, the Snooper goes into communications break condition.
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How to Select 5 or 6-Digit Registers
In Master or Snooper Mode, it is possible to select
either a five-digit or a six-digit Register Number.
Once the operator has enabled a PV, entered a Slave
ID, and chosen a Function Code, the scanner will arrive
at the Register Number menu (reg.nbr). Press the
Right arrow to display the number of digits being used
and then the Up arrow to change the setting for the
number of digits to be used for that register
(5 dig or 6 dig), then press ENTER.
Notes:
1. If Function Code 03 is selected, the Register
Number defaults to 40001; if Function Code 04 is
selected, the Register Number defaults to 30001.
2. Default Data Type is Float
3. Default Slave ID for PV1=001, for PV2=002, for
PV3=003, etc.
The Master ignores the decimal point setting for slave
devices that specify a Short or Long integer. For
example, a slave that is displaying 12.34 is read as
1,234. Floating point data may or may not utilize the
decimal point. Refer to the slave’s operating manual
to make sure.
The Register Number range is based on the Function
Code and the number of digits selected. See the
following table:
Function
Code
5 Digit
6 Digit
03
40001 – 49999
400001 – 465536
04
30001 – 39999
300001 – 365536
65
65001-65999
N/A
Slave Mode (SlaVe)
The Slave mode is capable of accepting Short, Long,
and Float data types. Refer to the Modbus Register
Tables at www.predig.com for details of all the
predefined parameters. Follow the menu below to
navigate and set all parameters for Slave Mode.
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Setting Up the Scanner (setup)
The Setup menu is used to select:
1. PV Setup
a. PV Tags
b. PV Units
c. Format: Decimal point or Feet & Inches
d. Decimal Point
e. Scale input data
2. Display assignment & Intensity
3. Relay assignment and operation
4. 4-20 mA analog output scaling
Press the Menu button to exit at any time.
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Setting Up the Process Variables (PVs) (pV setup)
Enter the PV Setup menu to set up all the criteria associated with each enabled PV. Once you have selected the
desired PV, you can select parameters for each. These include tag, units, format, display decimal point, float decimal
point (resolution), and scaling of the input data.
Note: PV1 and PV2 can have multiple points for linearization. Only two points are available for all other PVs and for either the
Square Root or Programmable Exponent functions.
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Setting the Display Decimal Point (disp.dp)
Decimal point may be set one to five decimal places
or with no decimal point at all. Pressing the Up arrow
moves the decimal point one place to the right until no
decimal point is displayed, and then it moves to the
leftmost position. The decimal point is programmable
only for the Display Value.
Setting the Float Decimal Point (Flot..dp)
If floating point data type is selected, select the
number of decimals to correspond to the expected
floating point data; the numbers to right of the LSD
will be ignored by the scanner.
Example:
If you have a number such as 12.3456, you have to
tell the scanner how many digits to the right are of
interest to you. In this case selecting 4 places will
make use of all the digits. For most applications the
display decimal point will be set accordingly (i.e. 4
places).
If 2 decimal places are selected, the number 12.3456
is displayed as 12.35; notice that the number is
rounded up.
Scaling the PV Display Values (sCale)
The data that the scanner receives can be scaled to
display in engineering units. Input 1 must be less than
Input 2, Input 2 must be less than Input 3, etc. (known
as monotonic values). Press Enter to save the
changes or Menu to exit without saving. When the
Linear function is selected for PV1 & PV2, up to 32
points may be programmed to handle non-linear data.
Only two points are available for all other PVs and for
either the Square Root or Programmable Exponent
functions. Round Horizontal Tanks are scaled using
the length and diameter of the tank.
• Reverse Scaling
The meter can be scaled so that 4 mA represents
the high end of the process value range being
measured by the transmitter and 20 mA
represents the low end of the process value range.
Scale Menu
The display will show Error if the scaling or
calibration process is unsuccessful. Undesired
operation may occur if the error is not corrected.
Correct the error by either changing one of the inputs
in question or changing the number of points to
exclude an erroneous input point.
Notes:
1. For Feet & Inches Display format, the display values
will be in the format 99 FT 11 IN 15
/16th
or 8th. Make the left digit for inches and 16th blank if the
value is less than 10. Example: 50 Feet,
9 Inches, and 8/16 will be displayed as
50 FT _9 IN _8
16th
instead of 50 FT 09 IN 08
/16th
.
2. Scaling Short and Long input values (input 1, input 2,
etc.) should be done without the decimal point.
Multi-Point Linearization (Linear)
The scanner is set up at the factory for 2-point linear
scaling. Up to 32 linearization points may be selected
for PV1 and PV2. All other PVs have two linearization
points available. See Linear Function Menu (Linear)
on page 70 for details.
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Setting Up the Displays (dsplay setup)
Display Line 1 Parameters (Line 1 dsplay)
The top display (line 1) can be programmed to
display any of the following:
Display
Parameter
Setting Description
D pV
Display PV
Display PVs 1-16
D Ch-C
Display C Channel
Display Math Channels
C1-C4
PV.unit
Display PV & Units
Display PV & Units
Tg.pVn
Display Tag,
PV Number
Display Tag & PV
Number selected
Tg.pVn.u
Display Tag,
PV# & Units
Display Tag, PV Number
selected, & Units
C.unit
Display C & Units
Display C1-C4 & Units
Tg. C. u
Display Tag, C,
& Units
Display Tag, C1-C4 &
Units
Dset 1
Display Set Points
1-4
Display Set Points 1-4
Hi-pV
Display Max
PV 1-16
Display Maximum value
for each enabled PV1-16
Lo-pV
Display Min
PV 1-16
Display Minimum value
for each enabled PV1-16
Hi-C
Display Max
Ch C1-C4
Display Maximum for
math channels C1-C4
Lo-C
Display Min
Ch C1-C4
Display Minimum for math
channels C1-C4
Display Line 2 Parameters (Line 2 dsplay)
The bottom display (line 2) can be programmed to
display any of the following:
Display
Parameter
Setting Description
D pV
Display PV
Display PVs 1-16
D Ch-C
Display C
Channel
Display Math Channels
C1-C4
PV.unit
Display PV &
Units
Display PV & Units
Tg.pVn
Display Tag,
PV Number
Display Tag & PV
Number selected
Tg.pVn.u
Display Tag,
PV# & Units
Display Tag, PV Number
selected, & Units
C.unit
Display C & Units
Display C1-C4 & Units
Tg. C. u
Display Tag, C,
& Units
Display Tag, C1-C4 &
Units
Dset 1
Display Set Points
1-4
Display Set Points 1-4
Hi-pV
Display Max
PV 1-16
Display Maximum value
for each enabled PV1-16
Lo-pV
Display Min
PV 1-16
Display Minimum value
for each enabled PV1-16
Hi-C
Display Max
Ch C1-C4
Display Maximum for
math channels C1-C4
Lo-C
Display Min
Ch C1-C4
Display Minimum for math
channels C1-C4
D tag
Display Tag
Display Tag (Line 2 only)
D tag.u
Display Tag &
Units
Display Tag & Units
(Line 2 only)
D off
Display off
Display Off (Line 2 only)
Note: Toggling displays use the Scan Time for the value and
2 seconds for Tag and Units.
Display Intensity (d-IntY)
The scanner has eight display intensity levels to give
the best performance under various lighting
conditions. Select intensity 8 for outdoor applications.
The default intensity setting is 6.
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Display Line 1 Menu (Line 1 dsplay)
Note: For Tag-PVn and Tag-PVn-U, the default settings for PVs are 1,3,5, & 7, followed by two underscores, which represent empty
PVs. These all can be changed to any enabled PVs.
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Display Line 2 Menu (Line 2 dsplay)
Note: For Tag-PVn and Tag-PVn-U, the default settings for PVs are 2,4,6,& 8, followed by two underscores, which represent empty
PVs. These all can be changed to any enabled PVs.
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Setting the Tags (tAg) & Units (units)
Each PV can be setup with its own tag and units. See
the flow charts on the previous pages to access the
display menu to show the tag or toggling tag & units.
The engineering units and custom tags can be set
using the following 7-segment character set:
Display
Character
Display
Character
0
0
k K 1
1
l L 2
2
nm
m
3
3
n n 4
4
O O 5
5
o o 6
6
p P 7
7
q q 8
8
r r 9
9
s S A
A
t t b
b
u
u
C
C
v
V
c
c
uw
w
d
d
x X e
E
y
Y
f
F
z
Z
g
G
- - 9
g
/ / H
H
[ ] h
h
] [ I
I
= = I
i
!
Degree(<)
j
J
Space
Notes:
1. Degree symbol represented by (<) if programming with
ScanView.
2. The letters “m” and “w” use two 7-segment LEDs each;
when selected the characters to the right are shifted one
position.
3. Press and hold up arrow to auto-scroll the characters in
the display.
Application Example 1
In this application we have a system consisting of
(4) multivariable tank level gauges connected to
(2) PD8-6080 Modbus scanners displaying Product
Level, Interface Level, and Average Temperature.
One of the Modbus Scanners is located next to the
tanks and the other is located in the control room.
Register Numbers & Process Variables
30001 - Product Level
30003 - Interface Level
30017 - Average Temperature
The following table shows the system setup for a
typical multivariable level gauge, one PD8-6080
Master, and one PD8-6080 Snooper:
Parameter
PD8-6080
Master
PD8-6080
Snooper
Description/
Comment
Mode
Master
Snooper
PV1 Slave
ID
1
1
Function
Code
04
04
Register
PV1
30001
30001
Tank 1
Product
Level
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV2 Slave
ID
1 1
Function
Code
04
04
Register
PV2
30003
30003
Tank 1
Interface
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Parameter
PD8-6080
Master
PD8-6080
Snooper
Description/
Comment
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV3 Slave
ID
1
1
Function
Code
04
04
Register
PV3
30017
30017
Tank 1
Average
Temperature
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV4 Slave
ID
2
2
Function
Code
04
04
Register
PV4
30001
30001
Tank 2
Product
Level
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV5 Slave
ID
2
2 Function
Code
04
04 Register
PV5
30003
30003
Tank 2
Interface
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV6 Slave
ID
2
2
Function
Code
04
04
Register
PV6
30017
30017
Tank 2
Average
Temperature
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV7 Slave
ID
3
3
Function
Code
04
04
Parameter
PD8-6080
Master
PD8-6080
Snooper
Description/
Comment
Register
PV7
30001
30001
Tank 3
Product
Level
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV8 Slave
ID
3 3
Function
Code
04
04
Register
PV8
30003
30003
Tank 3
Interface
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV9 Slave
ID
3
3
Function
Code
04
04
Register
PV9
30017
30017
Tank 3
Average
Temperature
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV10
Slave ID
4
4
Function
Code
04
04
Register
PV10
30001
30001
Tank 4
Product
Level
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV11
Slave ID
4 4
Function
Code
04
04
Register
PV11
30003
30003
Tank 4
Interface
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
PV12
Slave ID
4
4
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ProtEX-MAX PD8-6080/PD8-6081 Explosion-Proof Modbus® Scanners
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Parameter
PD8-6080
Master
PD8-6080
Snooper
Description/
Comment
Function
Code
04
04
Register
PV12
30017
30017
Tank 4
Average
Temperature
Data Type
Long
integer
Binary,
Signed
Long
Byte Order
1234
1234
Scanner
ID
246
245
Polling
Time
5.0 sec
N/A
Slave
Response
Timeout
10.0 sec
10.0 sec
Baud
4800
4800
Parity
None 1
None 1
1 stop bit
Byte-toByte
Timeout
0.01 sec
0.01 sec
Decimal
point
3 places
3 places
Input 1
000000
000000
Scaling for
Level &
Interface
Display 1
000000
000000
Input 2
999999
999999
0.001 inch
resolution
Display 2
83.333
83.333
Feet
Application Example 2
In this application we have a system consisting of
(4) multivariable tank level gauges connected to
(2) PD8-6081s displaying Product Level, Interface
Level, and Average Temperature.
One of the Modbus Scanners is located next to the
tanks and the other is located in the control room. The
display readout is shown in sixteenths of an inch.
Register Numbers & Process Variables
30001 - Product Level
30003 - Interface Level
30017 - Average Temperature
Note: The example above shows the PD8-6081. The
setup of the scanner is the same as the first example.
The PD8-6081’s Feet & Inches display is clearly
visible.
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Setting the Relay Operation (relay)
This menu is used to set up the assignment and operation of the relays.
Relay Setup Menu (relay setup)
• During setup, the relays do not follow the input and they will remain in the state found prior to entering the Relay menu.
1. Assign Relay assignment
a. Assign relay to PV
b. Assign relay to Math channel
c. Assign relay to multiple PVs
(2 to 16 PVs)
2. Act 1 Relay action
a. Automatic reset only (non-latching)
b. Automatic + manual reset at any time
(non-latching)
c. Latching (manual reset only)
d. Latching with Clear (manual reset only
after alarm condition has cleared)
e. Pump alternation control (automatic
reset only)
f. Sampling (the relay is activated for a
user-specified time)
g. Off (relay state controlled by Interlock
feature)
3. Set 1 Set point & Rst 1 Reset point
4. Failsf Fail-safe operation
a. On (enabled)
b. Off (disabled)
5. Delay Time delay
a. On delay (0-999.9 seconds)
b. Off delay (0-999.9 seconds)
6. Break Relay action for communications
break or loss of 4-20 mA input
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Setting the Relay Action (act 1)
Operation of the relays is programmed in the Action
menu. The relays may be set up for any of the
following modes of operation:
1. Automatic reset (non-latching)
2. Automatic + manual reset at any time
(non-latching)
3. Latching (manual reset only, at any time)
4. Latching with Clear (manual reset only after
alarm condition has cleared)
5. Pump alternation control (automatic reset
only)
6. Sampling (the relay is activated for a
user-specified time)
7. Off (relay state controlled by Interlock
feature)
The following graphic shows relay 1 action setup;
relay 2-4 are set up in a similar fashion.
Programming Set and Reset Points
High alarm indication: program set point above reset
point.
Low alarm indication: program set point below reset
point.
The deadband is defined as the difference between
set and reset points. Minimum deadband is one
display count. If the set and reset points are
programmed with the same value, the relay will reset
one count below the set point.
Note: Changes are not saved until the reset point has been
accepted.
Setting Fail-Safe Operation (failsf)
In fail-safe mode of operation, the relay coil is
energized when the process variable is within safe
limits and the relay coil is de-energized when the
alarm condition exists. The fail-safe operation is set
independently for each relay. Select on to enable or
select off to disable fail-safe operation.
Programming Time Delay (delay)
The On and Off time delays may be programmed for
each relay between 0 and 999.9 seconds. The relays
will transfer only after the condition has been
maintained for the corresponding time delay.
The On time delay is associated with the set point.
The Off time delay is associated with the reset point.
Relay Action for Communications Break (break)
The Scanner will poll the slave device three times
before reporting a communications break condition.
After the third failure, the Response Timeout timer
starts and will determine the actual time to report a
PV in break condition.
1. Turn On (Go to alarm condition)
2. Turn Off (Go to non-alarm condition)
3. No Action (The relays will maintain the last
condition)
Refer to Relay Operation After Communications
Break on page 59 for details.
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Relay Action for Loss of 4-20 mA Input (Loop Break)
The loop break feature is associated with the 4-20 mA
input. Each relay may be programmed to go to one of
the above conditions when the scanner detects the
loss of the input signal (i.e. < 0.005 mA).
Notes:
1. This is not dependent on the Communications
Break or Response Timeout setting.
2. This is not a true loop break condition; if the signal
drops below 0.005 mA, it is interpreted as a “loop
break” condition.
The following graph shows the loop break relay
operation for a high alarm relay.
When the scanner detects a break in the 4-20 mA
loop, the relay will go to one of the following selected
actions:
1. Turn On (Go to alarm condition)
2. Turn Off (Go to non-alarm condition)
3. Ignore (Processed as a low signal condition)
Note: Select no Action
Time Delay Operation
The following graphs show the operation of the time
delay function.
When the signal crosses the set point, the On time
delay timer starts and the relay trips when the time
delay has elapsed. If the signal drops below the set
point (high alarm) before the time delay has elapsed,
the On time delay timer resets and the relay does not
change state. The same principle applies to the Off
time delay.
Note: If “Automatic or Manual (A-nmAn)” reset mode is
selected, the LED follows the reset point and not the relay
state when the relay is acknowledged.
Relay Sampling Operation
When the signal crosses the set point, the relay trips,
and the sample time starts. After the sample time has
elapsed, the relay resets. The cycle repeats every
time the set point is crossed, going up for high alarms
and going down for low alarms.
The sample time can be programmed between 0.1
and 5999.9 seconds.
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Relay and Alarm Operation Diagrams
The following graphs illustrate the operation of the
relays, status LEDs, and ACK button.
High Alarm Operation (Set > Reset)
For Manual reset mode, ACK can be pressed anytime to turn
"off" relay. To detect a new alarm condition, the signal must
go below the set point, and then go above it.
Low Alarm Operation (Set < Reset)
For Manual reset mode, ACK can be pressed anytime to turn
"off" relay. For relay to turn back “on”, signal must go above
set point and then go below it.
High Alarm with Fail-Safe Operation (Set > Reset)
Note: Relay coil is energized in non-alarm condition. In case
of power failure, relay will go to alarm state.
Low Alarm with Fail-Safe Operation (Set < Reset)
Note: Relay coil is energized in non-alarm condition. In case
of power failure, relay will go to alarm state.
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Pump Alternation Control Operation
Relay Operation After Communications Break
When a Master scanner fails to receive a reply from the slave it is called a Communications Break. The relays can be
programmed to react to this event by going On, Off, or No Action. After communication is restored, the relays are
turned off or on, based on their operating mode and their set and reset points, without regard to their prior state. This
is similar to the auto initialization on power up. Below is a diagram showing three examples.
The same is true for a scanner set up to operate in Snooper mode.
Relay 1
Manual mode
Relay 2
Manual mode
Input
de-energized
energized
Relay 3
Auto mode
Relay 1 Set
Relay 1 to 3
Reset
Relay 2 Set
Relay 3 Set
Communications
Break
Communications
Restored
No Serial
Communications
Communications
Break: No Action
Communications
Break: Relay "on"
Communications
Break: Relay "on"
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Relay Operation Details
Overview
The four-relays option for the scanners expand their
usefulness beyond simple indication to provide users
with alarm and control functions. Typical applications
include high and low temperature, level, pressure or
flow alarms, control applications such as simple on/off
pump control, and pump alternation control for up to
4 pumps. There are four basic ways the relays can be
used:
1. High and Low Alarms with Latching or
Non-Latching Relays
2. Simple On/Off Control with 100% Adjustable
Deadband
3. Sampling (Based on Time)
4. Pump Alternation Control for up to 4 Pumps
Relays Auto Initialization
When power is applied to the scanner, the front panel
LEDs and alarm relays will reflect the state of the
input to the scanner after the first response from the
slave device. The following table indicates how the
alarm LEDs and relays will react on power-up based
on the set and reset points:
Fail-Safe Operation (failsf)
The following table indicates how the relays behave
based on the fail-safe selection for each relay:
Fail-Safe
Selection
Non-Alarm State
Alarm State
Power
Failure
NO
NC
NO
NC
Off
Open
Closed
Closed
Open
Relays
go to
nonalarm
state
On
Closed
Open
Open
Closed
Relays
go to
alarm
state
Note: NO = Normally Open, NC = Normally Closed. This
refers to the condition of the relay contacts when the power
to the scanner is off.
Front Panel LEDs
The alarm status LEDs on the front panel are
available on all scanners, even those without relays
installed, and provide status indication for the
following:
LED
Status
1
Alarm 1
2
Alarm 2
3
Alarm 3
4
Alarm 4
The scanner is supplied with four alarm points that
include front panel LEDs to indicate alarm conditions.
This standard feature is particularly useful for alarm
applications that require visual-only indication. The
LEDs are controlled by the set and reset points
programmed by the user. When the display reaches a
set point for a high or low alarm, the corresponding
alarm LED will turn on. When the display returns to
the reset point the LED will go off. The front panel
LEDs respond differently for latching and non-latching
relays.
For non-latching relays, the LED is always off during
normal condition and always on during alarm
condition, regardless of the state of the relay
(e.g. Relay acknowledged after alarm condition).
For latching relays, the alarm LEDs reflect the status
of the relays, regardless of the alarm condition. The
following tables illustrate how the alarm LEDs function
in relation to the relays and the acknowledge button
(Default: F3 key assigned to ACK):
Latching and Non-Latching Relay Operation
The relays can be set up for latching (manual reset)
or non-latching (automatic reset) operation.
Relay terminology for following tables
Terminology
Relay Condition
On
Alarm (Tripped)
Off
Normal (Reset)
Ack
Acknowledged
The On and Off terminology does not refer to the
status of the relay’s coil, which depends on the
fail-safe mode selected.
• In latching relay mode, if Fail-Safe is off, latched
relays will reset (unlatch) when power is cycled.
Alarm #
HI or LO
Alarm
Set
Point
Reset
Point
PowerUp
Reading
Relay &
LED
1
HI
1000
500
499
Off 2 LO
700
900
499
On
3
LO
250
400
499
Off
4
HI
450
200
499
On
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Non-Latching Relay (Auto)
In this application, the scanner is set up for automatic
reset (non-latching relay). Acknowledging the alarm
while it is still present has no effect on either the LED
or the relay. When the alarm finally goes away, the
relay automatically resets and the LED also goes off.
Automatic reset only
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack (No effect)
On
On
Normal
Off
Off
Non-Latching Relay with Manual Reset (A-nman)
In this application, the scanner is set up for automatic
and manual reset at any time (non-latching relay).
The LED and the relay automatically reset when the
scanner returns to the normal condition.
In addition, the relay can be manually reset while the
alarm condition still exists, but the LED will stay on
until the scanner returns to the normal condition.
Automatic + manual reset at any time
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Normal
Off
Off
Next Alarm
On
On
Ack
On
Off
Normal
Off
Off
Latching Relay (LatcH)
In this application, the scanner is set up for manual
reset at any time. Acknowledging the alarm even if
the alarm condition is still present resets the relay and
turns off the LED.
Manual reset any time
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack
Off
Off
Latching Relay with Clear (Lt-Clr)
In this application, the scanner is set up for manual
reset only after the signal passes the reset point
(alarm condition has cleared). Acknowledging the
alarm while it is still present has no effect on either the
LED or the relay. When the alarm is acknowledged
after it returns to the normal state, the LED and the
relay go off. Notice that the LED remains on, even
after the scanner returns to the normal condition. This
is because, for latching relays, the alarm LED reflects
the status of the relay, regardless of the alarm
condition.
Manual reset only after
alarm condition has cleared
Condition
LED
Relay
Normal
Off
Off
Alarm
On
On
Ack (No effect)
On
On
Normal
On
On
Ack
Off
Off
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Acknowledging Relays
There are three ways to acknowledge relays
programmed for manual reset:
1. Via the programmable front panel function keys
F1-F3 (Example: F3 assigned to ACK).
2. Remotely via a normally open pushbutton wired
to the F4 terminal.
3. Remotely via a normally open push button wired
to one of the digital inputs and the +5 V terminal
on the digital I/O connections.
When the ACK button or the assigned digital input is
closed, all relays programmed for manual reset are
acknowledged.
Pump Alternation Control Applications (Altern)
For pump control applications where two or more
similar pumps are used to control the level of a tank
or a well, it is desirable to have all the pumps operate
alternately. This prevents excessive wear and
overheating of one pump over the lack of use of the
other pumps.
Up to 4 relays can be set up to alternate every time
an on/off pump cycle is completed. The set points and
reset points can be programmed, so that the first
pump on is the first pump off.
Application #1: Pump Alternation Using Relays 1 & 2
Set and Reset Point Programming
Relay
Set Point
Reset Point
Function
1
30.000
10.000
Controls
pump #1
2
35.000
5.000
Controls
pump #2
3
4.000
9.000
Controls
low alarm
4
40.000
29.000
Controls
high alarm
1. Relays 1 and 2 are set up for pump alternation.
2. Relays 3 and 4 are set up for low and high alarm
indication.
Pump Alternation Operation
1. Pump #1 turns on when the level reaches
30.000, when level drops below 10.000 pump #1
turns off.
2. The next time the level reaches 30.000, pump #2
turns on, when the level drops below 10.000,
pump #2 turns off.
3. If the level doesn’t reach 35.000 pump #1 and
pump #2 will be operating alternately.
4. If pump #1 cannot keep the level below 35.000
pump #2 will turn on at 35.000, then as the level
drops to 10.000 pump #1 turns off, pump #2 is
still running and shuts off below 5.000.
5. Notice that with the set and reset points of pump
#2 outside the range of pump #1, the first pump
on is the first pump to go off. This is true for up to
4 alternating pumps, if setup accordingly.
6. Relay #3 will go into alarm if the level drops
below 4.000 and relay #4 will go into alarm if the
level exceeds 40.000.
P- F4P+ COM V+
3412 5
mA+ COM V+ mA+
7869
+5 I1 I2 I3 I4 O1 O2 O3 O4 G
DO 1-4
GND
ACK
PDA1044 Digital I/O Module
1 2 3 4 5 6 7 8 9 10
DI 1-4
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Setting Up the Interlock Relay (Force On) Feature
Relays 1-4 can be set up as interlock relays. To set
up the relays for the interlock feature:
1. Access the Setup – Relay – Action menu and set
the action to off.
2. In the Advanced features – User menu, program
any of the digital inputs to Force On any of the
internal relays (1-4).
3. Connect a switch or dry contact between the +5 V
terminal and the corresponding digital input
(dI-1 to dI-4) terminal.
Interlock Relay Operation Example
Relays 1 & 2 are configured to energize (their front
panel LEDs are steady on) when SW1 & SW2
switches (above) are closed. If the contacts to these
digital inputs are opened, the corresponding front
panel LEDs flash, indicating this condition. The
processes being controlled by the interlock relay will
stop, and will re-start only after the interlock relay is
re-activated by the digital inputs (switches).
Note: If multiple digital inputs are assigned to the same
relay, then the corresponding logic is (AND) – i.e. both
switches must be closed to trip the relay.
• If the digital inputs are assigned to the Interlock
Function, then they cannot be used to program
the meter remotely.
Scaling the 4-20 mA Analog Output (Aout)
The 4-20 mA analog output can be scaled to provide
a 4-20 mA signal for any display range selected. The
Analog Output can be mapped to PVs or Math
Channels. To select the channel and source
assignments the analog output are assigned to, see
Analog Output Source Programming (aoutpr) on
page 77.
No equipment is needed to scale the analog outputs;
simply program the display values to the
corresponding mA output signal.
The Analog Output menu is used to program the
4-20 mA output based on display values.
For further details, see Setting Numeric Values on
page 40, Analog Output Value for Loss of
4-20 mA Input (Loop Break) on page 77
Notes: Changes to the settings are saved to memory only
after pressing ENTER. Changes made to settings prior to
pressing ENTER are not saved. Once ENTER is pressed,
the display moves to the next menu.
O1 O2 O3 O4 G
I1 I2 I3 I4+55 VDC
SW1
SW2
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Setting Up the Password (pass)
The Password menu is used for programming three
levels of security to prevent unauthorized changes to
the programmed parameter settings.
Pass 1: Allows use of function keys and digital
inputs
Pass 2: Allows use of function keys, digital inputs
and editing set/reset points
Pass 3: Restricts all programming, function keys,
and digital inputs
Protecting or Locking the Scanner
Enter the Password menu and program a six-digit
password.
Making Changes to a Password Protected Scanner
If the scanner is password protected, the scanner will
display the message Locd (Locked) when the Menu
button is pressed. Press the Enter button while the
message is being displayed and enter the correct
password to gain access to the menu. After exiting
the programming mode, the scanner returns to its
password protected condition.
Disabling Password Protection
To disable the password protection, access the
Password menu and enter the correct password
twice, as shown below. The scanner is now
unprotected until a new password is entered.
If the correct six-digit password is entered, the
scanner displays the message unLoc (Unlocked) and
the protection is disabled until a new password is
programmed.
If the password entered is incorrect, the scanner
displays the message Locd (Locked) for about two
seconds, and then it returns to Run Mode. To try
again, press Enter while the Locked message is
displayed.
Did you forget the password?
The password may be disabled by entering a
master password once. If you are authorized to
make changes, enter the master password 508655
to unlock the scanner.
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Advanced Features Menu
To simplify the setup process, functions not needed
for most applications are located in the Advanced
Features menu:
1. Scan Mode: Auto or manual; Go on alarm or
stop on alarm
2. Control relays and analog output
3. Noise Filter
4. Noise Filter Bypass
5. Rounding Feature
6. Select Math, Linearization function, Cutoff
7. User Programming for function keys and
digital I/O
8. Analog Channels Input Calibration
9. System Information
Advanced Menu Navigation Tips
• Press and hold the Menu button for three
seconds to access the Advanced Features Menu.
• Press the Up arrow button to scroll through the
Advanced Features Menu.
• Press Menu at any time, to exit and return to Run
mode.
• Changes made to settings prior to pressing
Enter/Scan are not saved.
• Changes to the settings are saved to memory
only after pressing Enter/Scan.
• The display automatically moves to the next
menu every time a setting is accepted by
pressing Enter/Scan.
Advanced Features Menu & Display Messages
Advanced Features Menu & Display Messages
Display
Parameter
Action/Setting
sCan
Scan
Enter Scan menu
nmode
Scan Mode
Select Auto or Manual
Scan Mode
Auto
Automatic
Select Automatic Scan
Mode
time
Scan Time
Select Scanning Time
nman
Manual
Select Manual Scan
Mode
Alarnm
Alarm
Select Go or Stop
Alarm
go
Go
Select Alarm Go
Stop
Stop
Select Alarm Stop
Contrl
Manual
Control
Enter Manual Control
menu for relays and
analog output 1
Auto
Automatic
Select Automatic
Control of Outputs and
Relays
nman
Manual
Select Manual Control
of Outputs and Relays
Aout 1
Analog
Output 1
Select Analog Output 1
for manual control
rly 1
Relay 1
Select Relay 1-4 for
manual control
on
On
Select On for
Relay 1-4
off
Off
Select Off for
Relay 1-4
filter
Filter
Enter Filter menu
PV 1
PV 1 Filter
Program Filter Value
for PV 1
PV 2
PV 2 Filter
Program Filter Value
for PV 2
bypass
Filter Bypass
Enter Filter Bypass
menu
PV 1
PV 1 Filter
Bypass
Program Filter Bypass
Value for PV 1
PV 2
PV 2 Filter
Bypass
Program Filter Bypass
Value for PV 2
round
Rounding
Feature
Enter Rounding
Feature menu
1*
1 Rounding
Value
Program Rounding
Value for PV
*(User-selectable &
rounds to the nearest
1, 2, 5, 10, 20, 50, 100)
select
Select
Enter Select menu
functn
Function
Enter data
Linearization Function
menu
PV 1*
PV 1 Function
*Enter Linearization
Function menu for all
enabled PVs
Ch C1*
Ch C1
Function
*Enter Linearization
Function menu for all
enabled math channels
Linear
Linear
Enter Linear menu
No pts
Number of
Points
Enter Number of
Linearization Points
Page 66
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Advanced Features Menu & Display Messages
Display
Parameter
Action/Setting
sCale
Scale
Scale Number of
Linearization Points
Inp 1
Input 1
Scale input 1 signal or
program input 1 value
Dis 1
Display 1
Program display 1 value
Inp 2
Input 2
Scale input 2 signal or
program input 2 value
(up to 32 points for PV1
& PV2)
Dis 2
Display 2
Program display 2 value
(up to 32 points for PV1
& PV2)
square
Square Root
Enter Square Root
menu
Prog e
Programmable
Exponent
Enter Programmable
Exponent menu
1.5000
Programmable
Exponent
Value
Enter the
Programmable
Exponent Value
rht
Round
Horizontal
Tank
Enter Round
Horizontal Tank menu
Inch
Inch
Enter to calculate tank
values in Inches
cnm
Centimeters
Enter to calculate tank
values in Centimeters
dianmr
Diameter
Enter tank diameter
Length
Length
Enter tank length
nmath
Math
Enter Math menu
Ch C1*
Channel C1
*Enter Math Channel
C1-C4 menu
Opertn
Operation
Enter Math Operation
menu
Const
Constant
Enter Math Constant
menu
Adder
Adder
Enter Adder Value
FACtr
Factor
Enter Factor Value
sunm
Sum
Math Function Sum
dif
Difference
Math Function
Difference
difabs
Absolute
Difference
Math Function
Absolute Difference
aVg
Average
Math Function Average
nmulti
Multiply
Math Function Multiply
diVide
Divide
Math Function Divide
Hi-pV
Max
Math Function
Maximum of all
selected PVs
Lo-pV
Min
Math Function
Minimum of all
selected PVs
drauw
Draw
Math Function Draw
uwaVg
Weighted
Average
Math Function
Weighted Average
ratio
Ratio
Math Function Ratio
Concen
Concentration
Math Function
Concentration
nmath2
Math2
Resultant Math
Channel
Math operation applied
to other math channels
(e.g. C3 = C1/C2)
Advanced Features Menu & Display Messages
Display
Parameter
Action/Setting
sunm
Sum
Math2 Function Sum
dif
Difference
Math2 Function
Difference
difabs
Absolute
Difference
Math2 Function
Absolute Difference
aVg
Average
Math2 Function
Average
nmulti
Multiply
Math2 Function
Multiply
diVide
Divide
Math2 Function Divide
Cutoff
Cutoff
Enter Low Flow Cutoff
menu
PV 1
PV 1 Cutoff
Program Cutoff Value
for PV 1
PV 2
PV 2 Cutoff
Program Cutoff Value
for PV 2
aoutPr
Analog Output
Program
Enter Analog Output
Programmable
parameters menu
Aout 1
Analog
Output 1
Analog Output 1
(If Installed)
SourCE
Analog Output
Data Source
Enter Analog Output
Data Source menu
PV 1*
Source PV
*Select PV for Analog
Output Data Source
Ch C1*
Source Math
Channel
*Select C1-4 for
Analog Output Data
Source
Set 1*
Set Point 1-4
*Select Set Points 1-4
break
Communications Break
Enter the Analog
Output value when
Communications Break
is detected
ignore
Ignore Break
Ignore Break
force
Force Break
Force Break
CALib
Calibration
Enter the Analog
Output Calibration
menu
nmAx
Maximum
Select Maximum value
for all Analog Outputs
nmin
Minimum
Select Minimum value
for all Analog Outputs
O-rang
Overrange
Enter the Analog
Output value for an
Overrange condition
u-rang
Underrange
Enter the Analog
Output value for an
Underrange condition
user
User
Enter the User menu
for assigning function
keys and digital I/O
F1*
F1-4
*F1-F4 Function Keys
preV
Previous
Previous PV
next
Next
Next PV
SCAn
Scan
Scan or pause scan
Ack
Acknowledge
Acknowledge relays
reset
Reset
Enter Reset menu
Rst Hi
Reset Max
Reset Maximum
Rst Lo
Reset Min
Reset Minimum
Rst HL
Reset
Max-Min
Reset Maximum &
Minimum
relay
Relay
Relay menu
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Advanced Features Menu & Display Messages
Display
Parameter
Action/Setting
Set 1*
Set Points 1-4
Set Points 1-4
Rly d
Relay Disable
Relay Disable
(all relays)
Rly e
Relay Enable
Relay Enable
(all relays)
O Hold
Output Hold
Output Hold (all relays)
d Hold
Display Hold
Display Hold
(while held low)
disabl
Disable
Disable
Contrl
Manual
Control
Manual Control menu
dI 1**
DI 1-4
*Digital Inputs 1-4
nmenu
Menu
Menu
right
Right
Right
up
Up
Up
enter
Enter
Enter
F on 1*
Force On
Relay 1
*Force On Relay 1-4
dO 1*
DO 1-4
*Digital Outputs 1-4
Alnm 1*
Alarm 1-4
*Alarm 1-4
Ack
Acknowledge
Acknowledge
reset
Reset
Enter Reset menu
Rst Hi
Reset Max
Reset Maximum
Rst Lo
Reset Min
Reset Minimum
Rst HL
Reset MaxMin
Reset Maximum &
Minimum
disabl
Disable
Disable
ICAL
Input
Calibration
Enter analog channels
Input Calibration menu
Ch-A
Channel A
Enter Input Channel A
Ch-b
Channel B
Enter Input Channel B
nmA
Milliamps
Enter Milliamps
C CAL
Milliamp
Calibration
Enter Milliamp
Calibration
C Lo
Milliamp Low
Signal
Enter Milliamp Low
Signal
C Hi
Milliamp High
Signal
Enter Milliamp High
Signal
Volt
Volts
Enter Volts
V CAL
Voltage
Calibration
Enter Voltage
Calibration
V Lo
Voltage Low
Signal
Enter Voltage Low
Signal
V Hi
Voltage High
Signal
Enter Voltage High
Signal
error
Error
Error Message for
Unsuccessful Calibration
diag
Diagnostic
Enter Diagnostics menu
reset
Reset
Reset to Factory
Defaults
Led t
LED Test
LEDs cycle through all
digits, decimal points,
and indicators
info
Info
Displays Scanner
information
sft
Software
Displays Software
information
Ver
Software
Version
Displays Software
Version information
Scan Function (SCan)
The Scan menu is used to program the PV scan
mode and the scanner’s behavior on alarm condition.
The operator is able to scan automatically based on a
time parameter, or scan manually with front panel
keys or digital inputs. The operator is also able to set
the scanner to stop on alarm or continue scanning on
alarm. To resume scanning the operator must press
the Next or Previous button. Please follow the menu
below for details. In the Stop on Alarm mode, the
scanner will go to the alarmed PV and remain there
until the operator manually advances to the next PV
or returns to the previous PV. If a new alarm is
detected the process is repeated. The scanner
ignores old alarms.
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Manual Control Menu (Contrl)
The Manual Control menu is used to control the 4-20 mA analog output and the relays manually, ignoring the input.
Each relay and analog output can be programmed independently for manual control. Selecting automatic control sets
all relays and analog output for automatic operation.
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Noise Filter (filter)
Most applications do not require changing this
parameter. It is intended to help attain a steady
display with unsteady (noisy) input data. The field
selectable noise filter averages any minor or quick
changes in the input data and displays the reading
with greater stability. Increasing the filter value will
help stabilize the display. However, this will reduce
the display response to changes on the input data.
The filter level may be set anywhere from 2 to 199.
Setting the filter value to zero disables the filter
function, and the bypass setting becomes irrelevant.
This parameter is associated with the analog input
channels, PV1, and PV2.
Noise Filter Bypass (bypass)
The scanner can be programmed to filter small input
changes, but allow larger input changes to be
displayed immediately, by setting the bypass value
accordingly. If the input signal goes beyond the
bypass value, it will be displayed immediately with no
averaging done on it. The noise filter bypass value
may be set anywhere from 0.2 to 99.9. Increasing the
bypass value may slow down the display response to
changes on the input signal.
Rounding Feature (round)
The rounding feature is used to give the user a
steadier display with fluctuating signals. Rounding is
used in addition to the filter function.
Rounding causes the display to round to the nearest
value according to the rounding criteria selected.
Select Menu (SELect)
The Select menu is used to select the input data
linearization function (linear, square root,
programmable exponent, or round horizontal tank),
math functions, constants, low-value cutoff, and
analog output programming. Multi-point linearization
is part of the linear function selection.
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Input Data Conditioning Function Menu (Functn)
The Function menu is used to select the input-to-output transfer function applied to the input data: linear, square root,
programmable exponent, or round horizontal tank volume calculation. Multi-point linearization (for PV1 and PV2) is
part of the linear function selection. Scanners are set up at the factory for linear function with 2-point linearization.
The linear function provides a display that is linear with respect to the input data (e.g 0.000 = 0.000, 10.000 = 10.000,
and then 5.000 = 5.000).
Linear Function Menu (Linear)
Scanners are set up at the factory for linear function with 2-point linearization. Up to 32 linearization points can be
selected for PV1 and PV2 under the Linear function in the Advanced Features menu. The multi-point linearization can
be used to linearize the display for non-linear signals such as those from level transmitters used to measure volume
in odd-shaped tanks or to convert level to flow using weirs and flumes with complex exponents.
Note: Multi-point Linearization applies to PV1 and PV2 only. All other PVs use two linearization points.
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Square Root Function Menu (Square)
The square root function is used to calculate flow measured with a differential pressure transmitter. The flow rate is
proportional to the square root of the differential pressure. Scale the scanner so that the low input signal (e.g. 4 mA)
is equal to zero flow and the high input signal (e.g. 20 mA) is equal to the maximum flow.
Programmable Exponent Function Menu (prog e)
The programmable exponent function is used to calculate open-channel flow measured with a level transmitter in
weirs and flumes. The flow rate is proportional to the head height. Scale the scanner so that the low input signal
(e.g. 4 mA) is equal to zero flow and the high input signal (e.g. 20 mA) is equal to the maximum flow. This method
works well for all weirs and flumes that have a simple exponent in the flow calculation formula. For weirs and flumes
with complex exponents it is necessary to use a strapping table and the 32-point linearization of the scanner.
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Round Horizontal Tank Function Menu (rht)
This function is used to calculate volume in a round
horizontal tank with flat ends. The volume is
calculated based on the diameter and length of the
tank. The tank’s dimensions can be entered in inches
or centimeters; the scanner automatically calculates
the volume in gallons or liters. After entering the
dimensions, complete the scaling process with the
display values calculated by the scanner. The
scanner can be re-scaled to display the volume in any
engineering unit without the need to re-enter the
dimensions again.
Changing the Volume from Gallons to Liters
In the graphic, entering the 48" for the diameter and
120" for the length of the round horizontal tank, the
scanner automatically calculates that the volume of
the tank is 940.02 gallons.
1. Convert gallons to liters
1 US gallon = 3.7854 L
940.02 gal = 3558.4 L
2. Go to the Setup - PV - Decimal Point menu and
change the decimal point to 1 decimal.
3. Go to the Setup - PV - Scale menu and press
Enter until dis 2 is shown on display line 1.
4. Press Enter and change the display 2 value to
3558.4.
5. The scanner is now displaying the volume in liters.
Note: The display can be scaled to display the volume in
any engineering units.
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Math Functions (nmath)
The Math menu is used to select the math function
that will determine the channels’ C1-C4 value. These
math functions are applied to PVs and other math
channels. The results are displayed by selecting
Display Channel C (d Ch C) in the Display menu.
Most math functions may be applied to all PVs: For
example, it is possible to add up to 16 PVs and
calculate the total volume of all the tanks in a field.
The Math2 function allows for further calculations on
the results of other math channels (e.g. C4 = C2/C1).
The following math functions are available:
Name
Math Operation
(Examples)
(P = Adder, F = Factor)
Setting
Addition
(PV1+PV2+P)*F
Sunm
Difference
(PV1-PV2+P)*F
diF
Absolute
difference
((Abs(PV1- PV2)+P)*F
diFAbS
Average
(((PV1+PV2)/2)+P)*F
AVG
Multiplication
((PV1*PV2)+P)*F
Nmulti
Division
((PV1/PV2)+P)*F
diVide
Max PV
Max value of all
selected PVs
Hi-pV
Min PV
Min value of all
selected PVs
Lo-pV
Draw
((PV1/PV2)-1)*F
drAuw
Weighted
average
((PV2-PV1)*F)+PV1
uwavg
Ratio
(PV1/PV2)*F
Ratio
Concentration
(PV1/(PV1+PV2))*F
Concen
Math 2
Math on other math
channels
Nmath2
Addition
C3 = (C1+C2+P)*F
Sunm
Difference
C4 = (C1-C2+P)*F
diF
Absolute
difference
C3 =
((Abs(C1- C2)+P)*F
diFAbS
Average
C4 =
(((C1+C2)/2)+P)*F
AVG
Multiplication
C3 = ((C1*C2)+P)*F
Nmulti
Division
C4 = ((C1/C2)+P)*F
diVide
Math Constants (Const)
The Math Constants menu is used to set the
constants used in the math channel. The math
functions include the selected PVs, as well as the
constants P (Adder) and the Factor F (Multiplier) as
indicated in the above examples.
The Adder constant (P) may be set from -99.999 to
999.999.
The Factor constant (F) may be set from 0.001 to
999.999.
The above chart details the math functions that may
be selected in the Math Function menu.
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Math Function Menu (nmath)
Notes:
1. In the above menu, “A” & “B” in equations can represent any PVs (PV1-PV16). See table above.
2. Each digit represents one PV in hexadecimal format, except PV16 (G).
3. PV1 – PV9 = 1 - 9, PV10 – PV16 = A – G
4. No PV selected = “underscore symbol”
5. Digit range: 1-G, then “_”
6. If there is an empty digit, the scanner will end the equation at that point.
7. For Math2 Channel, “C” is fixed, indicating which Math Channels are being processed.
8. Please refer to the following graphics for details on various Math Functions:
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Sum Menu (sunm)
Difference Menu (dif)
Difference Absolute Menu (difAbS)
Average Menu (aVg)
Multiplication Menu (nmulti)
Divide Menu (diVide)
Only two PVs at a time will be used for this function.
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Maximum PV Menu (Hi-pV)
Minimum PV Menu (Lo-pV)
Draw Menu (drauw)
Only two PVs at a time will be used for this function.
Weighted Average Menu (uwAvg)
Only two PVs at a time will be used for this function
Ratio Menu (ratio)
Only two PVs at a time will be used for this function
Concentration Menu (Concen)
Only two PVs at a time will be used for this function
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Low-Value Cutoff (CutofF)
The low-value cutoff feature allows the scanner to be
programmed so that the often unsteady output from a
differential pressure transmitter, at low flow rates,
always displays zero on the scanner. The cutoff value
may be programmed from 0.1 to 999999. When the
input data is below the cutoff value, the scanner will
display zero. Programming the cutoff value to zero
disables the cutoff feature. The cutoff can be disabled
to display negative values.
Analog Output Source Programming (aoutpr)
The 4-20 mA analog outputs can be programmed for
source of data, overrange and underrange, absolute
maximum and minimum output, and communications
break values. They can also be recalibrated.
• To calibrate the analog outputs, follow the
graphic above.
• The overrange and underrange values are the
values that will be output when the display shows
an overrange or underrange condition. This
setting is common to all analog outputs.
• The maximum and minimum values are the
absolute limits for the 4-20 mA output. This
setting is common to all analog outputs.
• The communications break value determines the
mA output when a Slave fails to reply to a
command within the Response time.
Analog Output Value for Loss of 4-20 mA Input (Loop Break)
The AoutPr - Break menu is used to force the analog
output to go to a user-specified mA value if a break
condition is detected in the 4-20 mA input loop.
Selecting Ignore causes the mA output to go to the
minimum value.
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Analog Output Calibration
• There is no need to recalibrate the 4-20 mA
output when first received from the factory.
• The 4-20 mA outputs is factory calibrated prior
to shipment. The calibration equipment is
certified to NIST standards.
The 4-20 mA output can be recalibrated in the field. A
calibrated digital meter with an input range of at least
25 mA and a resolution of 1 μA is recommended.
• If an uncalibrated meter or a meter with less
resolution is used, the calibration of the 4-20 mA
output could be adversely affected.
Analog Output Calibration Procedure
1. Wire the scanner 4-20 mA output to a current
loop that includes a power supply (internal or
external 12 to 24 VDC), and the mA input on the
digital meter. See Figure 16. 4-20 mA Output
Connections on page 32 for details.
2. Turn on all devices. Allow for a 15 to 30 minute
warm-up.
3. Go to the Advanced Features menu and navigate
to Select (Select) and choose Analog Output
Programming (AoutPr) → Calibration (Calib)
menu and press Enter.
4. The display will show 4 nmA. The scanner mA
output should now be close to 4 mA. Press Enter
and the display will show 04 .000. Enter the actual
value read by the digital mA meter and press
Enter.
5. The display will show 20 nmA. The scanner mA
output should now be close to 20 mA. Press
Enter and the display will show 20 .0 00. Enter the
actual value read by the digital mA meter and
press Enter.
6. The scanner will now calculate the calibration
factors and store them.
7. Press Menu to exit and return to Run mode.
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Programmable Function Keys User Menu (user)
The User menu allows the user to assign the front panel function keys F1, F2, and F3, the digital input F4 (located on
the input signal connector), and four digital inputs (located on the digital I/O connector) to access most of the menus
or to activate certain functions immediately (e.g. reset max & min, hold relay states, etc.). This allows the scanner to
be greatly customized for use in specialized applications.
The four digital outputs can be assigned to a number of actions and functions executed by the scanner (i.e. alarms,
relay acknowledgement, reset max, min, or max & min, tare, and reset tare). The digital outputs can be used to
trigger external alarms or lights to indicate these specific events.
Function Keys & Digital I/O Available Settings
Display
Description
sCan
Scan through all PVs
next
Skip to the next PV
preV
Return to the previous PV
Ack
Acknowledge all active relays that are
in a manual operation mode such as
auto-manual or latching
reset
Directly access the reset menu
Rst Hi
Reset the stored maximum display
values for all channels
Rst Lo
Reset the stored minimum display
values for all channels
Rst HL
Reset the stored maximum & minimum
display values for all channels
relay
Directly access the relay menu
Set 1*
Directly access the set point menu for
relay 1 (*through 4)
Rly d
Disable all relays until a button
assigned to enable relays (Rly E) is
pressed
Rly E
Enable all relays to function as they
have been programmed
O Hold
Hold current relay states and analog
output as they are until a button
assigned to enable relays (Rly E) is
pressed
Display
Description
D Hold
Hold the current display value, relay
states, and analog output momentarily
while the function key or digital input is
active. The process value will continue
to be calculated in the background.
disabl
Disable the selected function key or
digital I/O
Contrl
Directly access the manual control
menu
nmenu
Mimic the menu button functionality
(digital inputs only)
Right
Mimic the right arrow/F1 button
functionality (digital inputs only)
up
Mimic the up arrow/F2 button
functionality (digital inputs only)
Enter
Mimic the enter/F3 button functionality
(digital inputs only)
F on 1*
Force relay 1 (*through 4) into the on
state. This function is used in
conjunction with a digital input to
achieve interlock functionality. See
page 62 for details about interlock
relays.
Alrnm 1*
Provide indication when alarm 1
(*through 4) has been triggered (digital
outputs only)
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Digital Input Menu (dI 1)
Digital Output Menu (dO 1)
Reset Menu (reset)
The Reset menu is used to reset the maximum or minimum reading (peak or valley) reached by the process; both
may be reset at the same time by selecting “reset high & low” (rst HL). This is applied to all PVs and math channels.
Resetting is possible by going into the USER menu, selecting a function key or digital input, pressing ENTER to take
you to the next level, then pressing the Up arrow until you arrive at the RESET menu. Press ENTER to assign the
RESET menu to the selected function key or digital input. Now, when the scanner is in Run Mode, pressing the
selected function key will take you to the RESET menu, where you can scroll through Reset Hi (Max), Reset Lo (Min),
and Reset HiLo (Reset Max and Min), choosing what value to reset. You can also select the specific reset function
(e.g. Reset HiLo) to the selected digital input or function key.
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Input Calibration (ICAL)
Recalibrating the Analog Input Channels (Ch-A & Ch-B)
The analog input channels are calibrated at the
factory. If recalibration is needed, follow the flowchart
menu above and the instructions below.
1. Enter the ICAL menu to calibrate channel A
and channel B.
2. Select mA or Volt
3. Apply the low (4 mA or 0 V) and high (20 mA
or 10 V) signals as requested.
4. Press Enter to accept the values entered or
press Menu to exit calibration without saving
the changes.
Error Message (Error)
An error message indicates that the calibration or
scaling process was not successful. After the error
message is displayed, the scanner reverts to input 2
during calibration or scaling and to input 1 during
internal calibration, allowing the appropriate input
signal to be applied or programmed.
The error message might be caused by any of the
following:
1. Input signal is not connected to the proper
terminals, or it is connected backwards.
2. Minimum input span requirements not
maintained.
Input Range
Input 1 & Input 2 Span
4-20 mA
0.15 mA
10 VDC
0.10 VDC
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Scanner Operation
When installed, the primary way to operate the
scanner is with the SafeTouch through-glass buttons
that allow the user to perform various operations
without removing the cover and exposing the
electronics to the hazardous environment. The user
can also operate the scanner by connecting a suitable
control station or switch to one of the digital inputs
that can be used to perform various operations on the
scanner based on the Programmable Function Keys.
Finally, certain operations can be performed on the
scanner with ScanView software or through Modbus
commands.
The default operations that can be performed with the
scanner’s SafeTouch buttons are:
1. Display the maximum and minimum readings
2. Acknowledge the relays
3. Move to the next or previous PV or math
channel
4. Pause / resume scanning
In addition, the user can program the SafeTouch
Buttons to perform a variety of useful operations by
reassigning them to other functions per Function Keys
& Digital I/O Available Settings on page 79.
Button Operation
The following table shows the default operations for
the F1, F2, and F3 SafeTouch Buttons, Displaying
and resetting the maximum and minimum values and
resetting the relays:
Button Symbol
Description
Press to enter, exit
Programming Mode, or exit
max/min readings
Press to move to the
previous PV or math
channel
Press to move to the next
PV or math channel
Press once to pause
scanning, press again to
resume scanning
To learn more about SafeTouch buttons,
see this video:
predig.com/videos/Safetouch_Buttons
SafeTouch Buttons
The ProtEX-MAX is equipped with four sensors that
operate as through-glass buttons so that it can be
programmed and operated without removing the cover
(and exposing the electronics) in a hazardous area.
These buttons can be disabled for security by
selecting DISABLE on the switch labeled
NO-CONTACT BUTTONS located on the
connector board.
To actuate a button, press one finger to the glass
directly over the marked button area. Then retract
finger more than three inches from the glass before
pressing the next button. When the cover is removed,
the four mechanical buttons located next to the
sensors are used. The sensors are disabled when a
mechanical button is pressed and will automatically
be re-enabled after 60 seconds of inactivity.
The SafeTouch Buttons are designed to filter normal
levels of ambient interference and to protect against
false triggering, however, it is recommended that the
SafeTouch Buttons be disabled (slide switch to
DISABLE) if there is an infrared interference source in
line-of-sight to the display.
The SafeTouch Buttons are configured by default to
duplicate the function of the front panel mechanical
pushbuttons associated with the integrated meter.
The symbols by each SafeTouch button correspond
to a mechanical button as shown in the above table.
SafeTouch Button Tips:
• To the extent possible, install the display facing
away from sunlight, windows, reflective objects
and any sources of infrared interference.
• Keep the glass window clean.
• Tighten the cover securely.
• Use a password to prevent tampering.
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Function Keys Operation
During operation, the programmable function keys
operate according to the way they have been
programmed in the Advanced Features – User menu.
See Programmable Function Keys User Menu (user)
on page 79 for details.
The table in the Button Operation section shows the
factory default settings for F1, F2, and F3.
Digital Inputs Operation
Five (5) digital inputs, F4, DI-1 to DI-4, come standard
on the scanner. These digital inputs are programmed
identically to function keys F1, F2, and F3. The inputs
are triggered with a contact closure to +5 V in the
case of digital inputs 1-4 or with an active high signal,
see Digital I/O Connections on page 30 for details.
The F4 is triggered with a contact closure to COM or
with an active low signal. During operation, digital
inputs operate according to the way they are
programmed in the Advanced Features – User menu.
See Programmable Function Keys User Menu (user)
on page 79 for details.
Maximum/Minimum Readings
The max & min readings (peak & valley) reached by
the PVs or math channels can be displayed by
assigning the display to max/min through the Display
Setup menu.
A digital input should be programmed to reset the
max & min readings.
Troubleshooting
The rugged design and the user-friendly interface of
the scanner should make it unusual for the installer or
operator to refer to this section of the manual.
However, due to the many features and functions of
the scanner, it’s possible that the setup of the scanner
does not agree with what an operator expects to see.
If the scanner is not working as expected, refer to the
Diagnostics menu and recommendations below.
Diagnostics Menu (diag)
The Diagnostics menu is located in the Advanced
Features menu, to access Diagnostics menu see
Advanced Features Menu on page 65. This menu
allows the user to test the functionality of all the
scanner LEDs, check the scanner’s software and
version information, and erase the ScanView software
installation files from the scanner. Press the Enter
button to view the settings and the Menu button to exit
at any time.
Testing the Display LEDs
To test all LEDs on the display:
1. Go to the Diagnostics menu (diAG) and
press Enter button.
2. Press Up arrow button and scroll to
LED Test menu (led t)
3. Press the Enter button to activate the LED
Test. The scanner will cycle through all
digits, decimal points, and relay indicators to
enable the operator to check that all LEDs
are functioning properly.
4. Press the Enter button again to access the
Information menu (info) or press the Menu
button to return to Run Mode.
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Determining Software Version
To determine the software version of a scanner:
1. Go to the Diagnostics menu (diAG) and
press Enter button.
2. Press Up arrow button and scroll to
Information menu (Info).
3. Press Enter to access the software number
(SFT) and version (UER) information. Write
down the information as it is displayed.
Continue pressing Enter until all the
information is displayed.
4. The scanner returns to Run Mode after
displaying all the settings.
Reset Scanner to Factory Defaults
When the parameters have been changed in a way
that is difficult to determine what’s happening, it might
be better to start the setup process from the factory
defaults.
Instructions to load factory defaults:
1. Enter the Advanced Features menu, see
Advanced Features Menu on page 65.
2. Press Up arrow to go to Diagnostics menu
3. Press and hold Right arrow for three seconds,
press Enter when display flashes reset.
Note: If Enter is not pressed within three seconds, the
display returns to Run Mode.
4. The scanner goes through an initialization
sequence (similar as on power-up) and loads the
factory default settings.
Factory Defaults & User Settings
The following table shows the factory setting for most
of the programmable parameters on the scanner.
Factory Defaults & User Settings
Parameter
Display
Default Setting
Mode
nmode
Master
Function Code
FunCod
03
PV Number
PV.nbr
PV1-PV4
Enabled
Slave ID PV1-16
SlaV.Id
001 - 016
Register Number
PV1-16
Reg.nbr
40001
Data Type PV1-16
Data
Float
Byte Order
1234
Big-endian
Polling Time
t-poll
5.0 second
Slave Response
Timeout
t-resp
10.0 second
Serial
Serial
Scanner ID
SCAn.Id
246
Baud
baud
9600
Parity
parity
Even
Byte-to-byte
timeout
t-byte
0.01 second
Setup
Setup
Tag
PV1-16
Tag
PV1
PV 1 – PV 16
Units
PV1-16
Units
PV1
FEET
Units C1-4
Units
Ch C1
UnitC1 – UnitC4
Display
Format PV1-16
Fornmt
PV1
Dec (PD8-6080)
Ft-In-16 (PD8-6081)
Display
Format C1-4
Fornmt
Ch C1
Decimal
Display decimal
point
Disp.dp
ddd.ddd
Float decimal point
Flot.dp
ddd.ddd
Number of points
No pts
2 (all PVs and C
channels)
Scaling
SCalE
pV 1
All
Input 1
InP 1
0.000
Display 1
Dis 1
0.000
Input 2
InP 2
10.000
Display 2
Dis 2
10.000
Math,
channel C1-4
Sunm
Sum
Adder (constant P)
Adder
0.000
Factor (constant F)
Factor
1.000
Filter
Filter
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Factory Defaults & User Settings
Parameter
Display
Default Setting
Filter, PV 1
Ch-A
70
Filter, PV 2
Ch-B
70
Bypass, PV 1
bypass
0.2
Bypass, PV 2
bypass
0.2
Round
Round
1
Cutoff
Cutoff
Cutoff value, PV 1
Ch-a
0.0 (disabled)
Cutoff value, PV 2
Ch-b
0.0 (disabled)
Display
assignment
Dsplay
Line 1
D pV
Display PV
Line 2
d tag
Display tag
Display intensity
d-Inty
6
Relay 1
assignment
PV 1
PV 1
Relay 1 action
Act 1
Automatic
Relay 1 set point
Set 1
1.000
Relay 1 reset point
RSt 1
0.500
Relay 2
assignment
PV 2
PV 2
Relay 2 action
Act 2
Automatic
Relay 2 set point
Set 2
2.000
Relay 2 reset point
RSt 2
1.500
Relay 3
assignment
PV 3
PV 3
Relay 3 action
Act 3
Automatic
Relay 3 set point
Set 3
3.000
Relay 3 reset point
RSt 3
2.500
Relay 4
assignment
PV 4
PV 4
Relay 4 action
Act 4
Automatic
Relay 4 set point
Set 4
4.000
Relay 4 reset point
RSt 4
3.500
Fail-safe relay 1
Fls 1
Off
Fail-safe relay 2
Fls 2
Off
Fail-safe relay 3
Fls 3
Off
Fail-safe relay 4
Fls 4
Off
On delay relay 1
On 1
0.0 sec
Off delay relay 1
Off 1
0.0 sec
On delay relay 2
On 2
0.0 sec
Off delay relay 2
Off 2
0.0 sec
Factory Defaults & User Settings
Parameter
Display
Default Setting
On delay relay 3
On 3
0.0 sec
Off delay relay 3
Off 3
0.0 sec
On delay relay 4
On 4
0.0 sec
Off delay relay 4
Off 4
0.0 sec
Communications
break relay 1
On
On
Communications
break relay 2
On
On
Communications
break relay 3
On
On
Communications
break relay 4
On
On
Display 1
analog output
Dis 1
00.00.00
Output 1 value
Out 1
4.000 mA
Display 2
analog output
Dis 2
20.00.00
Output 2 value
Out 2
20.000 mA
Source analog
output
Source
PV 1
Overrange output
O-rang
21.000 mA
Underrange output
u-rang
3.000 mA
Communications
break output
break
1.000 mA
Maximum output
nmAx
23.000 mA
Minimum output
nmin
1.000 mA
F1 function key
F1
Previous PV
F2 function key
F2
Next PV
F3 function key
F3
Scan/Pause
F4 function
(digital input)
F4
Acknowledge
relays
Digital input 1
DI 1
Menu
Digital input 2
DI 2
Right arrow
Digital input 3
DI 3
Up arrow
Digital input 4
DI 4
Enter
Digital output 1
DO 1
Alarm 1
Digital output 2
DO 2
Alarm 2
Digital output 3
DO 3
Alarm 3
Digital output 4
DO 4
Alarm 4
Password 1
Pass 1
000000 (unlocked)
Password 2
Pass 2
000000 (unlocked)
Password 3
Pass 3
000000 (unlocked)
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Troubleshooting Tips
This scanner is a highly sophisticated instrument with an extensive list of features and capabilities. If the
programming buttons are used to program the scanner, it may be a difficult task to keep everything straight. That is
why we strongly recommend the use of the free ScanView software for all programming activities. A USB cable is
provided with the scanner for programming with ScanView software.
If you have programmed the scanner with the programming buttons and it is not working as intended, try
re-programming the scanner using ScanView software.
Symptom
Check/Action
No display at all
Check power at power connector
Not able to change setup or programming,
Locd is displayed
Scanner is password-protected, enter correct six-digit password to unlock or Master
Password of 508655.
Scanner does not respond to input change
If a Low-Value Cutoff value has been programmed, the scanner will display zero below
that point, regardless of the input – which can appear like the scanner is not responding
to an input change. Check to make sure the problem is not being caused by an
undesired low-value cutoff value. To prevent the display from showing a negative value,
set the low-value cutoff to a value greater than zero.
Scanner displays error message during
scaling (Error)
Check inputs: Input 2 must greater than Input 1, Input 3 must be greater than
Input 2, etc.
Scanner displays
1. 999999
2. -99999
Indicating overrange or underrange condition
Check the input data value and scaling in Setup menu
Display stop scanning, ■ LED indicator
flashing
Check:
1. Stop on alarm feature has been enabled
2. Press PREV or NEXT to resume scanning
Displays break message
Check:
1. RS-485 connection to slave devices
2. Slave Id, register number of slave devices
3. Baud rate and parity of all devices on the bus
4. Scanner Id must be different from other devices
Snooper mode not reading the PVs on the
RS-485 bus
Check:
1. Increase Master’s Transmit Delay
(e.g. Snooper delay = 100ms, Master delay = 110ms)
2. Increase Snooper’s byte-to-byte timeout
3. Decrease the slave device’s transmit delay to <10ms
4. Snooper cannot read the same PV twice, check setup
Scanner experiencing faults and
communication breaks
Check:
1. Increase response time (t-resp) and/or transmit delay (tr dly). This may
require some trial and error, as these are dependent upon the number of
devices on the bus.
2. Internal Scan ID Modbus address. Addresses 256 (mA) or 257 (V) are used for
Channel A, while Addresses 258 (mA) or 259 (V) are used for Channel B.
Scanner not communicating with ScanView
software
Check:
1. Serial adapter and cable
2. Serial settings
3. Scanner address, baud rate, and transmit delay
Display does not respond to input data,
reading a fixed number
Check display assignment, it might be displaying max/ min
Display reading is not accurate
Check:
1. PV Scaling
2. Check format selected: Dec or Ft&In
Relay operation is reversed
Check:
1. Fail-safe in Setup menu
2. Wiring of relay contacts
Relay and status LED do not
respond to signal
Check:
1. Relay action in Setup menu
2. Set and reset points
Flashing relay status LEDs
Relays in manual control mode or relay interlock switches opened.
If the display locks up or the scanner does
not respond at all
Cycle the power to reboot the microprocessor.
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Troubleshooting Tips
Symptom
Check/Action
SafeTouch buttons do not respond
1. If mechanical button was pushed, the SafeTouch buttons will be re-enabled
automatically 60 seconds after the last button push.
2. If slide switch on connector board is in DISABLE position,
switch to ENABLE.
3. Strong direct sunlight may interfere with SafeTouch button operation. It is
recommended to operate the buttons by standing so as to block direct sunlight.
Serial Communications METER LINK LED
Indicator is off
Check:
1. Modular cable connection
2. Power to the device
If only the TX (or DATA IN) data status LED
is flashing when serial communications
attempted
Check:
1. Serial cable
2. Instrument address & baud rate
3. Program address & baud rate
If both data status LEDs (TX and RX) are
off when trying to communicate
Remove all unnecessary cables and instruments from the bus.
Try getting the system to work with only one device (to ease troubleshooting) and then
expand the system one device at a time.
Communications slow
Increase the baud rate
Random communication errors
1. Increase the TX delay time
2. Decrease the baud rate
Other symptoms not described above
Call Technical Support for assistance
Note: Certain sequences of events can cause unexpected results. To solve these issues, it is best to start fresh from factory
defaults and use the manual as a step by step programming guide, rather than a random approach to programming. To reset the
scanner to factory defaults, see Reset Scanner to Factory Defaults on page 84. In addition, for best results, we recommend using
the free ScanView software for all programming needs.
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NOTES
Page 89
Page 90
ProtEX-MAX PD8-6080/PD8-6081 Modbus® Scanners
Instruction Manual
PRECISION DIGITAL CORPORATION
233 South Street • Hopkinton MA 01748 USA
Tel (800) 343-1001 • Fax (508) 655-8990
www.predig.com
LIM8-6080_F
SFT088 Ver 2.020 & up
05/22
Contact Precision Digital
Technical Support
Call: (800) 610-5239 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
Sales Support
Call: (800) 343-1001 or (508) 655-7300
Fax: (508) 655-8990
Email: [email protected]
Place Orders
Email: [email protected]
For the latest version of this manual please visit
www.predig.com
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