Precision Digital PD865 User Manual

Page 1

SNOOPER MODEL PD865

MODBUS

SERIAL INPUT

Instruction Manual

 Modbus® RTU Master, Slave, or Snooper Mode  6-Digit Display, 0.56" (14 mm) High, Red LEDs, Sunlight Readable  Linear, Square Root, or Programmable Exponent  16-Point Linearization  Maximum/Minimum Display  Type 4X, NEMA 4X, IP65 Front  Universal Power Supply 85-265 VAC  12-36 VDC/12-24 VAC Power Option  2 or 4 Relays + 4-20 mA Output Options  24 VDC Transmitter Power Supply Option  RS-485 Serial Communications  Proxy Polling for up to 8 Process Variables

PRECISION DIGITAL CORPORATION

89 October Hill Road • Holliston, MA 01746 USA Tel (800) 343-1001 • Fax (508) 655-8990

www.predig.com

Page 2

PD865 Snooper Modbus Serial Input Meter Instruction Manual

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 disclaim any implied warranties of merchantability or fitness for a particular purpose.

CAUTION: Read complete

instructions prior to installation and operation of the meter.

Warning

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.

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.

Registered Trademarks

All trademarks mentioned in this document are the property of their respective owners.

WARNING: Risk of electric shock or personal injury.

www.predig.com

Page 3

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Table of Contents

INTRODUCTION ------------------------------------------------------------------------------------ 6 ORDERING INFORMATION -------------------------------------------------------------------- 6 SPECIFICATIONS --------------------------------------------------------------------------------- 7

General ------------------------------------------------------------------------------- 7 Operating Modes ----------------------------------------------------------------- 8 Programmable Features for Master Mode -------------------------------- 9 Serial Communications --------------------------------------------------------- 9 Display Functions -------------------------------------------------------------- 10 Relays ------------------------------------------------------------------------------ 11 Isolated 4-20 mA Transmitter Output ------------------------------------ 12

COMPLIANCE INFORMATION -------------------------------------------------------------- 13 

Safety ------------------------------------------------------------------------------- 13

SAFETY INFORMATION ----------------------------------------------------------------------- 13 INSTALLATION ----------------------------------------------------------------------------------- 14

Unpacking ------------------------------------------------------------------------- 14 Panel Mounting ------------------------------------------------------------------ 14

MOUNTING DIMENSIONS -------------------------------------------------------------------- 15

Connections ---------------------------------------------------------------------- 16

Connector Labeling ---------------------------------------------------------- 16 Power Connections ---------------------------------------------------------- 17 Serial Connections ----------------------------------------------------------- 18 Relay Connections ----------------------------------------------------------- 19 Switching Inductive Loads -------------------------------------------------- 19 4-20 mA Output Connections ---------------------------------------------- 21

SETUP AND PROGRAMMING --------------------------------------------------------------- 22

Front Panel Buttons and Status LED Indicators --------------------- 23 Display Functions and Messages ----------------------------------------- 24 Main Menu ------------------------------------------------------------------------ 29 Setting Numeric Values ------------------------------------------------------ 29 Meter Setup ----------------------------------------------------------------------- 30 Operating Modes (nmode) ---------------------------------------------------- 30

Master Mode (nmastr) ------------------------------------------------------ 31 Proxy Polling Mode ---------------------------------------------------------- 32 Slave Mode (Slave) --------------------------------------------------------- 34 Snooper Mode (Snoopr) ---------------------------------------------------- 35 Serial Communications (SEriAL) ----------------------------------------- 36 Program Menu (Prog) ------------------------------------------------------- 36 Setting the Display Decimal Point (disp..dp) --------------------------- 37



Page 4

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Setting the Float Decimal Point (Flot..dp) ------------------------------ 37 Scaling the Display Value (scale) --------------------------------------- 38 Setting the Relay Operation (relay) ------------------------------------ 39 Relay and Alarm Operation ------------------------------------------------ 42 Scaling the 4-20 mA Analog Output (Aout) ---------------------------- 49

Setting Up the Password (pass) ------------------------------------------- 50

Locking the Meter ------------------------------------------------------------ 50 Unlocking the Meter ---------------------------------------------------------- 51

Advanced Features Menu ---------------------------------------------------- 52

Advanced Features Menu & Display Messages ---------------------- 53 Display Math Function (func) --------------------------------------------- 54 Noise Filter (filter) -------------------------------------------------------- 55 Noise Filter Bypass (bypass) ---------------------------------------------- 55 Low-Flow Cutoff (CutofF) -------------------------------------------------- 55 Analog Output Programming (aoutpr) ---------------------------------- 56 4-20 mA Output Calibration ------------------------------------------------ 57 Display Intensity (d-inty) -------------------------------------------------- 58 Information (info) ------------------------------------------------------------ 58

OPERATION --------------------------------------------------------------------------------------- 59

Master and Slave Connections -------------------------------------------- 59 Maximum/Minimum Readings ---------------------------------------------- 62

TROUBLESHOOTING -------------------------------------------------------------------------- 63

Determining Software Version --------------------------------------------- 63 Reset Meter to Factory Defaults ------------------------------------------- 63

Factory Defaults & User Settings ----------------------------------------- 64

Troubleshooting Tips --------------------------------------------------------- 68

SLAVE MODE REGISTER TABLE ---------------------------------------------------------- 69

Register Table Notes ---------------------------------------------------------- 79 Register Bit Assignment Tables ------------------------------------------- 81

Page 5

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Table of Figures

Figure 1: Panel Cutout and Mounting ............................................... 14

Figure 2: Meter Dimensions – Side View .......................................... 15

Figure 3: Case Dimensions – Top View ............................................ 15

Figure 4: Connector Label: 4 Relays, 4-20 mA Out & 24 V Supply 16

Figure 5: Power Connections ............................................................ 17

Figure 6: RS-485 Connection ............................................................ 18

Figure 7: Standard and Optional Relay Connectors........................ 19

Figure 8: AC and DC Loads Protection ............................................ 19

Figure 9: Low Voltage DC Loads Protection .................................... 20

Figure 10: 4-20 mA Output Powered by Meter ................................. 21

Figure 11: 4-20 mA Output Powered Externally ............................... 21

Figure 12: PD865 Slave & Snooper Connected to a Master ............ 59

Figure 13: PD865 Master Connected to a Smart Sensor & Chart

Recorder .............................................................................................. 59

Figure 14: PD865 Master Connected to a PD765 Meter ................... 60

Figure 15: PD865 Master & Snoopers Connected to Multivariable

Level Transmitters ............................................................................. 60

Figure 16: PD865 Master & Snoopers Connected to Level and

Temperature Sensors......................................................................... 61



Page 6

PD865 Snooper Modbus Serial Input Meter Instruction Manual

INTRODUCTION

The PD865 Snooper Modbus Serial Input Meter can be programmed as a Modbus RTU Master, Slave, or Snooper. As a Master, the PD865 reads a slave device, scales the data from it, displays the result, and operates the internal relays and 4-20 mA output. The PD865 Master mode is capable of polling up to 8 process variables (Proxy polling feature); it displays PV1 and allows other PD865s in Snooper mode to read any of the variables being polled by the Master. As a Slave, it is controlled by a master device. The data sent to it by the master is scaled, displayed, and used to operate the relays and 4-20 mA output. As a Snooper the PD865 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 PD865 Snooper is housed in a shallow-depth 1/8 DIN panel meter enclosure that features a NEMA 4X front panel. Data is displayed on an adjustable intensity, six-digit seven-segment LED display. The Snooper can be powered from 85-265 VAC or 12-36 VDC. It comes standard with 2 relays and is available with 2 additional relays and 4-20 mA output as options.

ORDERING INFORMATION

85-265 VAC* Model

PD865-6R2-06 2 relays PD865-6R5-16

PD865-6R7-16 PD865-7R5-06 2 relays, 4-20 mA output

PD865-7R7-06 4 relays, 4-20 mA output

*All models may be powered from AC or DC. See Specifications for details.

Accessories

Model Description

PDA7485-I RS-232 to RS-422/485 Isolated Converter PDA7485-N RS-232 to RS-422/485 Non-Isolated Converter PDA8485-I USB to RS-422/485 Isolated Converter PDA8485-N USB to RS-422/485 Non-Isolated Converter PDX6901 Suppressor (snubber): 0.01 µF/470Ω, 250 VAC

Enclosures **Enclosures available for 1-10 meters. Visit our website for details.

12-36 VDC* Model

NEMA 4 & explosion-proof enclosures** Plastic, steel, stainless steel & cast aluminum

Installed

2 relays, 4-20 mA output/24 V transmitter supply

4 relays, 4-20 mA output/24 V transmitter supply

Page 7

PD865 Snooper Modbus Serial Input Meter Instruction Manual

SPECIFICATIONS

Except where noted all specifications apply to operation at +25°C.

General

Input/Output Modbus RTU over RS-485 DISPLAY Six digits, 0.56" (14 mm) high, red LED. Displays from

DISPLAY UPDATE RATE

OVERRANGE Values greater than the highest Input value programmed

UNDERRANGE Values less than the Input 1 value cause the display to

PROGRAMMING METHODS

RECALIBRATION Only required for the 4-20 mA output. Calibrated at the

MAX/MIN DISPLAY

PASSWORD Programmable password restricts modification of

NON-VOLATILE MEMORY

POWER AC: 85-265 VAC, 50/60 Hz

REQUIRED FUSE

ISOLATED TRANSMITTER POWER SUPPLY

ISOLATION 4 kV input/output-to- powe r line

-199999 to 999999, automatic leading zero blanking. Master: 10/second to once every 25.5 seconds

Slave/Snooper: Dependent on master device (e.g. PLC)

cause the display to flash

-199999

flash Four front panel buttons, or via Modbus registers.

factory. Recalibration is recommended at least every 12 months.

Max/min readings are stored until reset by the user or when power to the meter is turned off. User can reset by front panel pushbuttons or via Modbus registers.

programmed settings. All programmed settings are stored in non-volatile memory

for a minimum of ten years, with or without power.

DC: 90-265 VDC Optional: 12-36 VDC, 12-24 VAC

999999

Model Watts PD865-6R2-06 6 PD865-6R5-16 8 PD865-6R7-16 15 PD865-7R5-06 10 PD865-7R7-06 10

UL Recognized, 5 A max, slow-blow; up to 6 meters may share one fuse.

One transmitter power supply (Optional) 24 VDC  10% @ 200 mA max. (-1 option)

500 V input-to-output or output-to-24 VDC supply

Page 8

PD865 Snooper Modbus Serial Input Meter Instruction Manual

ENVIRONMENTAL Operating temperature range: -40 to 65°C

CONNECTIONS Removable screw terminal blocks accept 12 to 22 AWG

ENCLOSURE 1/8 DIN, high impact plastic,

MOUNTING 1/8 DIN panel cutout required. Two panel mounting

TIGHTENING TORQUE

OVERALL DIMENSIONS

WEIGHT 8.0 oz (227 g) (2 relays)

WARRANTY 3 years parts and labor

Storage temperature range: -40 to 85°C Relative humidity: 0 to 90% non-condensing

wire.

UL 94V-0, color: gray

bracket assemblies provided Screw terminal connectors: 4.5 lb-in (0.5 Nm)

2.45" x 4.68" x 4.19" (62 mm x 119 mm x 106 mm) (H x W x D)

9.7 oz (275 g) (4 relays, 4-20mA Output & 24 V supply)

Operating Modes

MASTER Processes data read from a Modbus RTU slave device

SLAVE Processes data sent to it from a Modbus RTU master

SNOOPER Listens to the Modbus traffic and picks up a specific register

(only one process variable at a time can be displayed on the master).

Proxy polling feature: Polls up to 8 process variables from up to 8 slave devices. The Master processes and displays PV1 and allows other PD865s in Snooper mode to read any of the variables being polled.

device.

or registers being polled by a Master device from a specific slave device and processes the data being read.

Note: The relays and the 4-20 mA output are functional in all modes.

Page 9

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Programmable Features for Master Mode

FUNCTION CODE Select which Modbus function code (03 or 04) to use in

NUMBER OF PVs

SLAVE ID Assign the slave ID or address (1-247) containing the

DATA TYPE Select the data format that the slave device uses. Select

POLL TIME 0.1 to 25.5 sec. Time between read-commands (Master

SLAVE RESPONSE TIMEOUT

reading the slave device. Select the number of process variables to be polled by the

Master (PV1-PV8).

process variables to be displayed (Slave ID for PV1-8). 5 digit: 30001-39999 or 40001-49999

6 digit: 300001-365536 or 400001-465536 Specifies which register(s) to read in the slave device. Range is dependent on Function Code selection (04 or 03) and digits selection (5 or 6). PV2-PV8: Select 1 register for Short integer or 2 registers for Long integer and Floating point data types.

between Short integer (2 byte) and Long integer (4 byte) or floating point (4 byte), Signed or Unsigned (integer only) and byte order (big-endian vs. little-endian).

mode) or listening-time window (Snooper mode). 0 to 25.4 seconds X3 (76.2 sec). Time allowed for the slave

to respond to a command. Programming 0 disables the timeout. This setting is used by Master and Slave modes.

Serial Communications

SLAVE ID OR ADDRESS

BAUD RATE 300 – 19,200 bps DATA 8 bit (1 start bit, 1 or 2 stop bits) PARITY None, even, or odd. 1 or 2 stop bits selectable for None. BYTE-TO-BYTE

TIMEOUT TURN AROUND

DELAY

1 – 247. Specifies the ID or address of the slave device (Master or Snooper mode) or the address of the PD865 (Slave mode).

0.01 – 2.54 seconds

Less than 2 ms (fixed)

Page 10

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Functions

INTENSITY 1 to 8. To optimize viewing based on ambient lighting

DISPLAY DECIMAL POINT

FLOAT DECIMAL POINT

MATH FUNCTIONS

MULTIPOINT SCALING

NOISE FILTER Programmable from 2 to 199 (0 will disable filter) BYPASS 0.2 to 99.9% of full-scale. CUTOFF

conditions. Up to five decimal places:

ddd . ddd,

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).

Linear, square root, or programmable exponent (0.50000 to 2.99999).

2 to 16 points.

0 to 999999. 0 disables cutoff.

dddd . dd, ddddd .d, or dddddd

d . ddddd, dd .dddd,

Page 11

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Relays

RATING Standard: 2 relays, SPST (Form A)

ELECTRICAL NOISE SUPPRESSION

DEADBAND 0-100% of full scale, user selectable HIGH OR LOW

ALARM RELAY

OPERATION

RELAY RESET User selectable via front panel buttons or Modbus control Automatic reset only (non-latching)

TIME DELAY 0 to 199 seconds, on and off delays

FAIL-SAFE OPERATION

COMMUNICATIONS BREAK

AUTO INITIALIZATION

Fail-safe operation: relay coil is energized in non-alarm condition. In case of

power failure, relay will go to alarm state.

Optional: 2 relays, SPDT (Form C) All relays are rated 3 A @ 30 VDC or 3 A @ 250 VAC, resistive loads.

A suppressor (snubber) should be connected to each relay contact switching inductive loads to prevent disruption to the microprocessor’s operation. Recommended suppressor value: 0.01 µF/470 , 250 VAC (PDX6901).

User may program any alarm for high or low trip point.

Automatic (non-latching) Latching Pump alternation control (up to 4 relays)

Automatic + manual reset at any time (non-lat ching) Manual reset only, at any time (latching) Manual reset only after alarm condition has cleared (latching) Automatic reset: Relays will automatically reset when the

input passes the reset point. Manual reset: Front panel ACK button. Pressing ACK

resets all manually resettable relays.

Programmable and independent for each relay Programmable

Independent for each relay No change, Relay on, or Relay off.

Controls the condition the relay goes to when a slave device does not reply (Available also in Slave mode v1.1 & up).

When power is applied to the meter, relays will reflect the state of the input to the meter.

Page 12

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Isolated 4-20 mA Transmitter Output

CALIBRATION Factory calibrated for 4-20 mA SCALING RANGE 1.000 to 23.000 mA for any display range.

ACCURACY ± 0.1% F.S. ± 0.004 mA TEMPERATURE

DRIFT EXTERNAL LOOP

POWER SUPPLY OUTPUT LOOP

RESISTANCE 24 VDC 35 VDC (external) DATA

SOURCE OVERRANGE Programmable mA output for overrange condition. UNDERRANGE Programmable mA output for underrange condition. COMMUNICA-

TIONS BREAK

MAXIMUM OUTPUT

MINIMUM OUTPUT

Reverse scaling allowed.

50 PPM/C from 0 to 65C ambient

35 VDC maximum

Power supply Minimum Maximum

10  700 

100  1200 

Display Value, Maximum Display Value, Minimum Display Value, or Modbus Register.

Programmable mA output when a slave device does not reply within the Slave Response Timeout (Available also in Slave mode v1.1 & up).

Programmable absolute maximum mA output desired.

Programmable absolute minimum mA output desired.

Page 13

PD865 Snooper Modbus Serial Input Meter Instruction Manual

COMPLIANCE INFORMATION

Safety

UL LISTED USA and Canada

UL FILE NUMBER E160849 FRONT PANEL UL Type 4X, NEMA 4X, IP65; panel gasket provided

UL 508 Industrial Control Equipment

SAFETY INFORMATION

Warning!

CAUTION: Read complete

instructions prior to

installation and operation

of the meter.

Hazardous voltages exist within enclosure. Installation and service should be performed only by trained service personnel.

WARNING: Risk of

electric shock or

personal injury.

Page 14

PD865 Snooper Modbus Serial Input Meter Instruction Manual

INSTALLATION

There is no need to remove the meter from its case to complete the installation, wiring, and setup of the meter.

Unpacking

Remove the meter from box. Inspect the packaging and contents for damage. Report damages, if any, to the carrier.

If any part is missing or the meter malfunctions, please contact your supplier or the factory for assistance.

Panel Mounting

 Prepare a standard 1/8 DIN panel cutout – 3.622" x 1.772" (92 mm

x 45 mm). Refer to Figure 1 for more details.

 Clearance: allow at least 4" (102 mm) behind the panel for wiring.  Panel thickness: 0.04" - 0.25" (1.0 mm - 6.4 mm).

Recommended minimum panel thickness to maintain Type 4X rating: 0.06" (1.5 mm) steel panel, 0.16" (4.1 mm) plastic panel.

 Remove the two mounting brackets provided with the meter (back-off

the two screws so that there is ¼" (6.4 mm) or less through the bracket. Slide the bracket toward the front of the case and remove).

 Insert meter into the panel cutout.  Install mounting brackets and tighten the screws against the panel.

To achieve a proper seal, tighten the mounting bracket screws evenly until meter is snug to the panel along its short side. DO NOT OVER TIGHTEN, as the rear of the panel may be damaged.

Figure 1: Panel Cutout and Mounting

Page 15

PD865 Snooper Modbus Serial Input Meter Instruction Manual

MOUNTING DIMENSIONS

Figure 2: Meter Dimensions – Side View

865SideViewDim

Figure 3: Case Dimensions – Top View

Page 16

PD865 Snooper Modbus Serial Input Meter Instruction Manual

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

Caution!

Connector Labeling

The connectors’ label, affixed to the meter, shows the location of all connectors available with requested configuration.

performed in accordance with all applicable national, state, and local codes to prevent damage to the meter and ensure personnel safety.

Figure 4: Connector Label: 4 Relays,

4-20 mA Out & 24 V Supply

Page 17

PD865 Snooper Modbus Serial Input Meter Instruction Manual Power Connections

Power connections are made to a two-te rminal co nnecto r labeled POWER in Figure 2. The meter will operate reg ardless of DC pola rity connection. The + and - symbols are only a suggested wiring con ven tion.

POWER CONNECTOR

Recommended External

Fuse: 1 A, 250 V Slow Blow

Figure 5: Power Connections

AC or DC

POWER

Page 18

PD865 Snooper Modbus Serial Input Meter Instruction Manual Serial Connections

The PD865 is connected to an RS-485 bus with up to 32 nodes. For systems consisting of more than 32 nodes, RS-485 repeaters are necessary. Wiring connections to the PD865 are made via the three position screw terminal connector labeled RS-485. Please refer to the EIA-485 standard for complete specifications for balanced digital multipoint communications. The use of shielded twisted pair cable is recommended to protect the data signals from electrical interference. For long wire runs it is good practice to terminate the bus at both ends with a resistor connected between D+ and D- that matches the characteristic impedance of the cable. A typical termination resistor value is 120 Ω.

RS-485 Connector

D+ D- G

1 2 3

Data + Data Common

Shield

Twisted-Pair

Figure 6: RS-485 Connection

For point-to-point (non-multipoint) serial communications with RS-232 data communications equipment (e.g. a personal computer), an RS-232 to RS-485 converter (e.g. the Precision Digital PDA7485) is required. When using the PDA7485, connect the PD865 according to the PDA7485 wiring diagram for a two wire RS-485 application.

Page 19

PD865 Snooper Modbus Serial Input Meter Instruction Manual Relay Connections

Connections to the two, standard Form A relays, are made to the connector labeled RLY1 and RLY2. See Figure 5. Connections to the two optional Form C relays are made to the six-terminal connector labeled RELAY3 and RELAY4.

Figure 7: Standard and Optional Relay Connectors

Switching Inductive Loads

The use of suppressors (snubbers) is strongly recommended when switching inductive loads to prevent disrupting the microprocessor’s operation. The suppressors 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:

L O A

Figure 8: AC and DC Loads Protection

Choose R and C as follows: R: 0.5 to 1  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 meter's relay screw terminals. An RC network may also be installed across the load. Experiment for best results.

4. For low voltage DC loads, place a diode across the load with a reverse breakdown voltage two to three times the circuit voltage and a forward

current at least as large as the load current. Shown in

Figure 9

Page 20

PD865 Snooper Modbus Serial Input Meter Instruction Manual

L O A D

Figure 9: Low Voltage DC Loads Protection

RC Networks 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 1/14th HP (50 watts) with an inductive load.

Page 21

PD865 Snooper Modbus Serial Input Meter Instruction Manual

4-20 mA Output Connections

Connections for the 4-20 mA transmitter output are made to the connector terminals labeled “mA OUT, I-, I+”. The 4-20 mA output may be powered from an internal power supply (optional) or from an external power supply.

24V OUT

P+

P-

mA OUT RLY2 RLY1

I- I+ NO COM NO COM

3 4 5 6

Remote Display,

Chart Recorder,

etc.

Figure 10: 4-20 mA Output Powered by Meter

mA OUT RLY2 RLY1

I- I+ NO COM NO COM

Remote Display,

Chart Recorder,

etc.

External

Power

Supply

Figure 11: 4-20 mA Output Powered Externally

3 4 5 6

Page 22

PD865 Snooper Modbus Serial Input Meter Instruction Manual

SETUP AND PROGRAMMING

 There is no need to recalibrate the 4-20 mA

output (when installed) as received from the factory.

 T he 4-20 mA output is factory calibrated

prior to shipment. The calibration equipment is certified to NIST standards.

Overview

There are no jumpers involved in the meter setup procedure. Setup and programming is done through the front panel buttons. After power and signal connections have been completed and verified,

apply power to the meter.

Page 23

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Front Panel Buttons and Status LED Indicators

Button Symbol

Description LED Status

Menu Right arrow/Reset Up arrow/Max Enter/Ack

1 Alarm 1 2 Alarm 2 3 Alarm 3 4 Alarm 4 S Set point indicator R Reset point indicator

 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

programming.

 Press the Up arrow button to scroll through the menus, decimal

point, or to increment the value of a digit.

 Press the Enter/Ack button to access a menu, to accept a setting, or

to acknowledge a relay.

 Press and hold the Right arrow and the Menu buttons, for three

seconds, to access the Advanced features of the meter (Tip: press and hold Right arrow first then Menu).

 See page 62 to display maximum and minimum readings.

Page 24

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Functions and Messages

The meter displays various functions and messages during setup/programming and operation. The following table shows the displayed functions and messages with their action/setting description.

Display Parameter Action/Setting

nmodE

nmAStr

FunCod

Fun 03

Fun 04

Pv.nbr

SLAv.Id

Id-Pv1

Id-Pv2

Id-Pv3

Id-Pv4

Id-Pv5

Id-Pv6

Id-Pv7

Id-Pv8

rEG.nbr

Reg.Pv1

Reg.Pv2

Reg.Pv3

Mode Master Function

Code Function

Code 03 Function

Code 04 Number of

PVs Slave ID

PV1 ID PV2 ID PV3 ID PV4 ID PV5 ID PV6 ID PV7 ID PV8 ID Register

Number PV1

Enter the Mode menu. Select Master Mode. Enter the Function Code menu for Master or

Snooper mode. Use Function Code 03 to read slave device.

Use Function Code 04 to read slave device.

Enter the Number of PVs to be read from the slave device(s).

Enter the Slave ID menu for Master and Snooper modes. Enter the Slave ID or address for Slave mode.

Enter the Slave ID or address for PV1. Enter the Slave ID or address for PV2. Enter the Slave ID or address for PV3. Enter the Slave ID or address for PV4. Enter the Slave ID or address for PV5. Enter the Slave ID or address for PV6. Enter the Slave ID or address for PV7. Enter the Slave ID or address for PV8. Enter the Register Number menu.

Enter the Register Number for PV1.

Enter the Register Number for PV2.

Enter the Register Number for PV3.

Page 25

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Parameter Action/Setting

Reg.Pv4

Reg.Pv5

Reg.Pv6

Reg.Pv7

Reg.Pv8

1-reg

2-reg

5 dig 6 dig

Data.1

Short

Long

Float

bcd

binary

unSigd

SignEd

1234

4321

PV4 Register

PV5 Register

PV6 Register

PV7 Register

PV8 Register

1 Register

2 Registers

Reg. Numb. digits

Data Type Short

Integer Long

Integer Floating

Point BCD Binary

Unsigned

Signed

Byte Order Byte Order

Enter the Register Number for PV4.

Enter the Register Number for PV5.

Enter the Register Number for PV6.

Enter the Register Number for PV7.

Enter the Register Number for PV8.

Select 1 register for the assigned PV (short integer).

Select 2 registers for the assigned PV (long, float).

Select either 5 (x0001-x9999) or 6 (x00001x65536) digits for the Register Number by pressing the Right arrow in Register Number menu.

Enter the Data type menu for PV1. Select Short Integer as the data type to be read

from the slave device (PV1). Select Long Integer as the data type to be read

from the slave device (PV1). Select Floating Point as the data type to be read

from the slave device (PV1). Select BCD format for Short or Long integers. Select Binary format for Short or Long

integers. Select Unsigned Binary format for Short or Long

integers. Select Signed Binary format for Short or Long

integers. Select big-endian byte order. Select little-endian byte order.

Page 26

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Parameter Action/Setting

2143

3412

T-PoLL

t-rESP

Slave

Snoopr

Serial

Baud

300

600

1200

2400

4800

9600

19200

PArity

1 Stop

2 Stop

Even

odd

t-byte

Prog

Byte Order

Poll Time

Slave Response Timeout

Slave Snooper Serial Baud 300 baud 600 baud 1200 baud 2400 baud 4800 baud 9600 baud 19200 baud Parity No parity 1 Stop bit 2 Stop bits Even parity Odd parity Byte-to-byte

timeout Program

Select byte-swapped big-endian byte order. Not available for Short integer.

Select byte-swapped little-endian byte order. Not available for Short integer.

Enter the time between read commands. In other words, how often the display is updated in Master mode or how long to wait for data in Snooper mode.

Enter the time allowed for a slave device to respond to a command.

This setting is applicable to Master and Slave modes.

Select Slave mode. Select Snooper mode. Enter Serial menu. Enter the Baud rate menu. Select 300 baud for all serial communications. Select 600 baud for all serial communications. Select 1200 baud for all serial communications. Select 2400 baud for all serial communications. Select 4800 baud for all serial communications. Select 9600 baud for all serial communications. Select 19200 baud for all serial communications. Enter the Parity menu. Select No parity. Select 1 stop bit with no parity Select 2 stop bits with no parity Select Even parity. Select Odd parity. Enter the timeout value allowed between

received bytes. Enter the Programming menu.

Page 27

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Parameter Action/Setting

Disp.dp

FLot.dP

Scale

inP 1

dis 1

save ?

RELaY

RLY1

Act1

Auto

A-nman

LatCH

Lt-CLr

Altern

oFF

Set1

rSt1

FaiLSF

FLS 1

off

DeLAY

Display Decimal Point

Float Decimal Point

Scale Input

Point 1 Display

Point 1 Save?

Relay Relay1

Action1 Automatic Auto-

manual Latching Latching-

cleared Alternate Off

Set1 Reset1 Fail-safe Fail-safe1

On Off Delay

Set the decimal point position for the display. This is independent from float decimal point.

Select the decimal point for the expected floating point data.

Enter the Scaling menu. Enter the Input value for point 1. Up to 16 points

can be entered in Linear mode. Enter the Display value for point 1. Up to 16

points can be entered in Linear mode. Press Enter to save scaling data. Press Menu to

exit without saving. Enter the Relay menu. Relay 1 setup. Similar menus for Relays 2 to 4

are not shown here. Set relay 1 action (automatic, latching, etc.). Set relay for automatic reset. Set relay for automatic + manual reset any time.

Set relay for latching operation. Set relay for latching operation with manual reset

only after alarm condition has cleared. Set relays for pump alternation control. Disable relay and front panel status LEDs.

Disable relay fail-safe operation. Program set point for Relay 1. Program reset point for Relay 1. Enter Fail-safe menu. Set relay 1 fail-safe operation. Similar menus for

Relays 2 to 4 are not shown here. Enable fail-safe operation. Disable fail-safe operation. Enter Time Delay menu.

Page 28

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Parameter Action/Setting

DLY 1

on 1

oFF 1

break

break1

no act

oFF

Aout

diS 1

out 1

diS 2

out 2

pass

unloC

loCd

999999

-199999

Relay 1 Delays

Relay 1 On Delay

Relay 1 Off Delay

Communica tions Break Action

Relay 1 Break Action

No Action

Off Action

On Action

Analog Output Scaling

Display 1

Output 1

Display 2

Output 2

Password Unlocked

Locked

Flashing display

Enter relay 1 time delay setup. Similar menus for Relays 2 to 4 are not shown here.

Set relay 1 On time-delay.

Set relay 1 Off time-delay.

Enter Communications Break menu.

Enter Relay 1 Break Action. Similar menus for Relays 2 to 4 are not shown here.

No change in Relay state when Communications Break detected.

Relay turns off when Communications Break detected.

Relay turns on when Communications Break detected.

Enter the Analog Output Scaling menu.

Program the first Display value for the Analog Output.

Program the first Output value that corresponds to the Display 1 value for the Analog Output.

Program the second Display value for the Analog Output.

Program the second Output value that corresponds to the Display 2 value for the Analog Output.

Enter the Password menu. Meter is unlocked.

Program password to lock meter. Meter is locked.

Enter password to unlock meter.

Overrange condition and Underrange conditions.

Page 29

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Main Menu

The main menu consists of the most commonly used functions: Mode, Serial, Program, and Password.

 Press Menu button to enter Meter Programming then press Up

arrow button to scroll through the main menu.

Run Program

9865 nmode serial prog pass

 Press Menu at any time, to exit and return to Meter Run. Changes

made to settings prior to pressing Enter/Ack are not saved.

 Changes to the settings are saved to memory only after pressing

Enter/Ack.

 The display automatically moves to the next menu every time a

setting is accepted by pressing Enter/Ack.

Setting Numeric Values

The numeric values are set using the Right and Up arrow buttons. Press Right arrow to select next digit and Up arrow to increment digit value.

The digit being changed is displayed brighter than the rest. Press the Enter/Ack button, at any time, to accept a setting or Menu

button to exit without saving changes. Pressing Menu to exit while entering Scaling data does not save any of the Scaling data.

Select

Next Digit

04.00 04.00 05.00

If a digit cannot be changed because it will cause an out of range value, the next digit will be selected automatically.

Go to the Program-Decimal Point menu to select the decimal point.

Increment

Digit Value

Accept Setting

Next Menu

Item

Page 30

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Meter Setup

Operating Modes (nmode)

The Mode menu is used to select how the meter 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. Proxy polling feature: The Master polls from 1 to 8 process variables from 1 to 8 slave devices. The Master processes and displays PV1 and allows other PD865s in Snooper mode to read any of the variables being polled.

2. 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. All parameters are accessible via the Slave Mode Register Table on page 69.

3. 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 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 Meter Programming. Press the Enter/Ack 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 Meter Run.

nmode nmastr slave SnooPr

Page 31

PD865 Snooper Modbus Serial Input Meter Instruction Manual Master Mode (nmastr)

The Master mode contains the following submenus: select which Function Code to use, the number of PVs to poll, the slave IDs and register numbers, the type and format of data for PV1, the slave Polling time and Response timeout.

nmastr

funCod

PU.nbr

Enter Number

of Process

Variables

fun 03 fun 04

SLAv.1d

1 d-pv1

Enter Slave ID

for PV1

reg.nbr

data.1

reg.Pv1

Enter Register Number Value

5 dig 6 dig

short long float

binary bcd

t-poll

Enter Polling

Time Value

Press Right Arrow to display and change the setting for the number of digits used for the Register Number.

t-resp

Enter Response

Timeout Value

Press Enter/Ack to

Make Selections

Press Up Arrow to

Scroll Through Choices

Press Menu to Exit at

any Time

unsigd signed

1234 4321 2143 3412

The last two Byte-Order settings are not

available for Short Integer data types.

The Master ignores the decimal point setting for most 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

Page 32

PD865 Snooper Modbus Serial Input Meter Instruction Manual Proxy Polling Mode

Proxy Polling mode is enabled when a number greater than 1 is entered in the PUnbr (number of PV's) menu. In this mode, the PD865 acts as a Master and polls up to an additional 7 slave devices, enabling other PD865s, operating in Snooper mode, to read and display that polled data. In Proxy Polling mode, the PD865 Master always displays PV1, the first value polled.

The baud rate for polling more than 2 variables should be set to be greater than 4800 bps. A faster baud rate will produce fewer communication errors and breaks.

Application Using Proxy Polling

In this application we have a system consisting of an MTS M-Series multivariable level gauge connected to three PD865s displaying Pro duct Level, Interface Level, and Average Temperature.

30001 (40001) - Product Level 30003 (40003) - Interface Level 30017 (40017) - Average Temperature

Page 33

PD865 Snooper Modbus Serial Input Meter Instruction Manual

The following table shows the system setup for the MTS M-Series gauge, the PD865 Master, and the two PD865 Snoopers:

Parameter

PD865 Master

PD865 Snooper 1

PD865 Snooper 2

Mode Master Snooper Snooper Function Code 04 04 04 Number of PVs 3 N/A N/A Slave ID 247 247

PV1 247 PV2 247 PV3 247

Reg.PV1 30001 Reg.PV2 30003 (2 Reg.) Reg.PV3 30017 (2 Reg.)

Data Type

Long integer

Long Long

Binary, Signed Byte Order 1234 1234 1234 Polling Time 2.0 sec 10.0 sec 10.0 sec Slave Response

5.0 sec N/A N/A

Timeout Baud 4800 4800 4800 Parity No No No Byte-to-Byte

0.01 sec 0.01 sec 0.01 sec

Timeout Decimal point 2 places 2 places 2 places Input 1 -199999 -199999 -199999 Display 1 -1999.99 -1999.99 -1999.99 Input 2 999999 999999 999999 Display 2 9999.99 9999.99 9999.99

Page 34

PD865 Snooper Modbus Serial Input Meter Instruction Manual Slave Mode (Slave)

The Slave mode is capable of accepting Long and Float data types. Refer to the Slave Mode Register Table for details of all the predefined parameters.

slave

SLAv.1d

Enter Slave ID

or Address

data.1

long float

serial prog pass nmode

baud parity t-byte

1 stop 2 stop

300 600 19200

unloC

Press Right Arrow to display and change the setting for the number of digits used for the Register Number.

Enter byte-to-byte

Timeout Value

no even odd

Press Enter/Ack to

Make Selections

Press Up Arrow to

Scroll Through Choices

Press Menu to Exit at

any Time

Page 35

PD865 Snooper Modbus Serial Input Meter Instruction Manual 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.

Snoopr

funCod

SLAv.1d

Enter Process Variable Value

fun 03 fun 04

reg.nbr

Enter Register Number Value

data.1

5 dig 6 dig

short long float

binary bcd

Enter Polling

Time Value

Press Right Arrow to display and change the setting for the number of digits used for the Register Number.

t-respt-poll

Press Enter/Ack to

Make Selections

Press Up Arrow to

Scroll Through Choices

Press Menu to Exit at

any Time

unsigd signed

1234 4321 2143 3412

The last two Byte-Order settings are not

available for Short Integer data types.

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 poll time for meters 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 Poll Time setting, the Snooper goes into communications break condition.

3. The Slave Response Timeout (t-resp) setting is not applicable to the Snooper mode.

Page 36

PD865 Snooper Modbus Serial Input Meter Instruction Manual Serial Communications (SEriAL)

The meter has an RS-485 interface. The baud rate, parity, and byte-tobyte timeout can be programmed.

Serial

Press Enter/Ack to

Make Selections

baud

parity

t-byte

Enter byte-to-byte

Timeout Value

Press Up Arrow to

Scroll Through

Choices

Press Menu t o Ex it

at any Time

no even odd

300 600

19200

Program Menu (Prog)

The Programming menu contains the menus for Display Decimal Point (diSP.dp), Scale, Relays, and Analog Output (4-20 mA).

Note: If Float data type has been selected, the program menu also

contains a Float Decimal Point (

FLot.dp

) selection.

prog

diSP.dP scALE relay aout

Page 37

PD865 Snooper Modbus Serial Input Meter Instruction Manual 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.

diSP.dp

dddddd ddddd.dd.ddddd

Setting the Float Decimal Point (Flot..dp)

If floating point data type is selected, the Float Decimal Point menu is available. 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 meter.

FLot.dP

dddddd ddddd.dd.ddddd

Example: If you have a number such as 12.3456, you have to tell the meter 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.

Page 38

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Scaling the Display Value (scale)

The data that the meter 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 Menu after all changes have been made. The display will flash Save ?. Press Enter to save the changes or Menu to exit without saving. When the Linear function is selected, up to 16 points may be programmed to handle non-linear data. Only two points are available for either the Square Root or Programmable Exponent functions. See the Advanced Features/Display Math Function menu on page 54 for more information.

Scale

inp 1 dis 1 dis 16inp 16

Only the programmed number of points will be shown in the menu. The range is from 2 to 16 points.

The display will alternate between Error and aa--bb if two inputs have the same value or are not monotonic, where AA and bb represent the two erroneous input points. 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.

Note: Data that is outside the working Input range will cause an out

of range condition. For example, if 4 points are programmed, data less than Input 1 will cause an underrange and data greater than Input 4 will cause an overrange.

Page 39

PD865 Snooper Modbus Serial Input Meter Instruction Manual Setting the Relay Operation (relay)

This menu allows you to set up the operation of the relays:

1. Relay action: Automatic reset only, Automatic + manual reset,

Latching, Latching with Clear, Pump alternation control, Off.

2. Set point

3. Reset point

4. Fail-safe operation: On, Off.

5. Time delay: On delay, Off delay (both 0-199 seconds).

6. Communications Break Action: No Action, Off, On.

relay

DelayRely 1 failsfRely 4 break

Same Menus for Relays

2 to 4 as Relay 1

Fls 1 Fls 4

Dlay 1 Dlay 4

Act 1 Set 1 Rset 1

Refer to page 24 for a description of Display Functions and Messages

break1 break4

Page 40

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Setting the Relay Action

The relays Action menu allows the user to set up the operation of the relays. 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. Off (relay and status LED disabled)

The following graphic shows the action menu for relay 1. Relays 2 to 4 are set up in a similar fashion.

From Relay 1

Act 1

Press Enter/Ack to

Make Selections

Press Up Arrow to

Scroll Through

Choices

Press Menu to

Exit at any Time

auto A-nman latCh Lt-Clr

altern off

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 determined by the difference between set and reset points. Minimum deadband is one display count. If set and reset points are programmed the same, relay will reset one count below set point. The following graphic shows the Set/Reset point menu for relay 1. The menu is similar for relays 2 to 4.

Quick Points

Set 1 Rset 1

Press Up arrow and Menu at the same time to access

Enter Set Point

Value

Enter Reset Point Value

set/reset points quickly.

Page 41

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Setting Fail-Safe Operation

The fail-safe operation is set independently for each relay. Select on to enable or select off to disable fail-safe operation.

failsf

Fls 1 Fls 4

Same Menus for Relays

2 to 4 as Relay 1

on off

Programming the On and Off Time Delays

Each relay has an On and Off time delay that may be programmed between 0 and 199 seconds. The relays will transfer only after the condition has been maintained for the corresponding time delay.

delay

Dlay 1 Dlay 4

Same Menus for Relays

2 to 4 as Relay 1

on 1 off 1

Enter On-Delay

Value

Enter Off-Delay

Value

Page 42

PD865 Snooper Modbus Serial Input Meter Instruction Manual Relay and Alarm Operation

The following graphs illustrate the operation of the relays, status LEDs, and Acknowledge (ACK) button.

High Alarm Operation (Set > Reset)

Input

Set

Reset

Relay

LED

de-energized

off

energized

Automatic (non-latching)

Relay

LED

ACK

pressed

Automatic or Manual (non-latching)

Relay

LED

ACK

pressed

Manual (latching)

Relay

LED

ACK

pressed

Manual only after passing below Reset (latching)

In Manual mode, ACK can be pressed anytime to turn the relay "off". For the relay to turn back "on", the signal must go below the set point, and then go above it.

Page 43

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Low Alarm Operation (Set < Reset)

Input

Reset

Set

Relay

LED

energized

de-energized

off

Automatic (non-latching)

Relay

LED

ACK

pressed

Automatic or Manual (non-latching)

Relay

LED

ACK

pressed

Manual (latching)

Relay

LED

ACK

pressed

Manual only after passing above Reset (latching)

In Manual mode, ACK can be pressed anytime to turn the relay "off". For the relay to turn back "on", the signal must go above set point, and then go below it.

Page 44

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Time Delay Operation

The following graphs show the operation of the time delay function.

Input

Set

Reset

<Tdelay <Tdelay >=Tdelay

Relay

LED

On Time Delay

Input

Set

Reset

<Tdelay <Tdelay >=Tdelay

Relay

LED

Off Time Delay

If 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: The LED is not affected by Time Delay when “Automatic or

Manual” reset mode is selected. Rather the LED follows the set and reset points.

Page 45

PD865 Snooper Modbus Serial Input Meter Instruction Manual

High Alarm with Fail-Safe Operation (Set > Reset)

Input

Set

Reset

Relay

LED

energized

off

de-energized

Automatic (non-latching)

Relay

LED

ACK

pressed

Automatic or Manual (non-latc h in g)

Relay

LED

ACK

pressed

Manual (latching)

Relay

LED

ACK

pressed

Manual only after passing below Reset (latching)

Fail-safe operation: relay coil is energized in non-alarm condition. In case of

power failure, relay will go to alarm state.

Page 46

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Low Alarm with Fail-Safe Operation (Set < Reset)

Input

Reset

Set

Relay

LED

de-energized

energized

off

Automatic (non-latching)

Relay

LED

ACK

pressed

Automatic or Manual (non-latching)

Relay

LED

ACK

pressed

Manual (latching)

Relay

LED

ACK

pressed

Manual only after passing above Reset (latching)

Fail-safe operation: relay coil is energized in non-alarm condition. In case of

power failure, relay will go to alarm state.

Page 47

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Pump Alternation Example for 3 Relays

Input

1. LEDs indicate the relay status.

Relay 1

Relay 2

Relay 3

Relay1 Set

Relay2 Set

Relay3 Set

Relay3 Reset

Relay2 Reset

Relay1 Reset

2. Any combination of 2 to 4 relays are available for alternating pump control.

Notes:

Page 48

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Relay Operation After Communications Break

When a Master meter 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 communications 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 meter set up to operate in Snooper mode.

Relay 3 Set Relay 2 Set Relay 1 Set

Relay 1 to 3

Reset

Input

Communications

Break

No Serial

Communications

Communications Restored

Relay 1

Manual mode

Relay 2

Manual mode

Relay 3

Auto mode

de-energized

energized

Communications Break: No Actio n

Communications

Break: Relay "on "

Communications

Break: Relay "on "

Page 49

PD865 Snooper Modbus Serial Input Meter Instruction Manual

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. No equipment is needed to scale the analog output; simply program the display values to the corresponding mA output signal.

aout

Dis 1

out 1

Dis 2

out 2

For instructions on how to program

numeric values see Setting

Numeric Values, page 29.

Page 50

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Setting Up the Password (pass)

The Password menu is used to program a four-digit password to prevent unauthorized changes to the programmed parameter settings.

Locking the Meter

Enter the Password menu and program a four-digit password.

For instructions on how to program numeric values see Setting Numeric Values, page 29.

3 seconds

pass unloC loCd0000

Program

Password

Record the password for future reference. If appropriate, it may be recorded in the space provided.

Model: Serial Number: Password: __ __ __ __

Return to Run

Page 51

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Unlocking the Meter

If the meter is password protected, the correct password must be entered in order to make changes to the parameter settings.

3 seconds

pass loCd unloC0000

Enter

Password

Return to Run

Entering the correct four-digit number sets the password to 0000, disabling the protection.

Changes to the programmed parameter settings are allowed only with the password set to 0000.

If the password entered is incorrect, the meter displays (Locked) for about two seconds, then it returns to Meter Run. To try again, press

Enter/Ack while the Locked message is displayed.

Forgot the Password?

The password may be disabled by the following procedure:

1. Note display reading prior to pressing the Menu button. Ignore decimal point and sign.

2. Access the Password menu, add 2 to the noted reading and enter that number as the password (e.g. display reading = -1.23, password = 0125).

Page 52

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Advanced Features Menu

To simplify the setup process, functions not needed for most applications are located in the Advanced Features menu: Display

Function, Noise Filter, Noise Filter Bypass, Cutoff, Analog Output Programming, Display Intensity, and Information.

 Press and hold the Right arrow and Menu buttons for three

seconds to access the Advanced Features. (Tip: press and hold the Right arrow button first, then the Menu button). Press the Up arrow button to scroll through the advanced features menu.

Press and hold

for 3 seconds

Press Enter/Ack to

Make Selections

Press Up A rrow t o

Scroll Through

Choices

Press Menu to Ex it

at any Time

funC

filter bypass Cutoff aoutpr D-inty info

 Press Menu at any time, to exit and return to Meter Run. Changes

made to settings prior to pressing Enter/Ack are not saved.

 Changes to the settings are saved to memory only after pressing

Enter/Ack.

 The display automatically moves to the next menu every time a

setting is accepted by pressing Enter/Ack.

Page 53

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Advanced Features Menu & Display Messages

Display Parameter Action/Setting

funC

Linear

no Pts

SQuare

Prog E

FiLtEr

bYPASS

CutofF

aoutPr

SourCE

diSP

nmAX

nmin

reg

O-rang

U-rang

break

nmaX

Function Linear Number of Points

Square Root Programmable

Exponent

Filter Bypass Cutoff Analog Output

Program Analog Output

Data Source Display Source

Maximum Display Source

Minimum Display Source

Overrange

Underrange

Communications Break

Max Analog Output

Enter Display Function menu. Select Linear Display Function. Enter the number of points for Linear Display

Function (2 to 16). Select Square Root Display Function. Select Programmable Exponent Display

Function. Programmable from 0.50000 to

2.99999. Set noise filter value. Set filter bypass value. Set low-flow cutoff value. Enter Analog Output Programmable

parameters menu. Enter Analog Output Data Source menu.

Select Display for Analog Output Data Source.

Select Maximum Display value for Analog Output Data Source.

Select Minimum Display value for Analog Output Data Source.

Select Modbus Register for Analog Output Data Source.

Enter the Analog Output value for an Overrange condition.

Enter the Analog Output value for an Underrange condition.

Enter the Analog Output value when Communications Break is detected. (Available also in Slave Mode v1.1 & up).

Enter the maximum value allowed for the Analog Output.

Page 54

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Display Parameter Action/Setting

nmin

CALib

nman

Auto

d-inty

info

Min Analog Output

Calibration Manual

Automatic

Display Intensity Information

Enter the minimum value allowed for the Analog Output.

Enter the Analog Output Calibration menu. Perform a manual calibration on the Analog

Output. Perform an automated calibration on the

Analog Output. Set the display intensity. Display software version and S/N

information.

Display Math Function (func)

The input data can be scaled using one of three selectable functions: Linear, Square Root, or Programmable Exponent.

funC

linear square Prog e

No pts

Enter Number

of Points

Enter Exponent

 Linear: The Linear function can be programmed to have from 2 to

16 points.

 The Square Root and Programmable Exponent functions have 2

points.

 The Programmable Exponent can be programmed from 0.50000 to

2.99999. Setting it to 0.50000 is the same as selecting the Square Root function.

Page 55

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Noise Filter (filter)

Most applications do not require changing this parameter. It is intended to help attain a steady display with an unsteady (noisy) input data.

The field selectable noise filter averages any minor or quick chan ges 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.

Noise Filter Bypass (bypass)

The meter 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.

Low-Flow Cutoff (CutofF)

The low-flow cutoff feature allows the meter to be programmed so that the often unsteady output from a differential pressure transmitter, at low flow rates, always displays zero on the meter.

The cutoff value may be programmed from 0 to 999999. When the input data is below the cutoff value, the meter will display zero. Programming the cutoff value to zero disables the cutoff.

Page 56

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Analog Output Programming (aoutpr)

The 4-20 mA analog output can be programmed for its source of data, overrange and underrange, absolute max and min output, and communications break values. It can also be calibrated manually or automatically.

Aoutpr

sourCe O-rang U-rang break nmax

Enter Over-range

disp nmax

Press En te r/ Ack to

Make Selections

Press Up Arro w to

Scroll Through Choices

Press Menu to Exit at

Val ue

Enter Under-range

any Time

Value

Enter

Communication-

Break Value

nmin reg

Comm unication-Break menu

available only in Master Mode.

Enter Ma xim u m

Output Val ue

nmin

Enter Mi ni m um

Output V alue

nman auto

4 nma

Enter Actual 4 mA Value

20 nma

Enter Actual

20 mA Val ue

Calib

Factory Use

Only!

 The overrange and underrange values are the values that will be

output when the display shows an overrange or underrange condition.

 The max and min values are the absolute limits for the 4-20 mA

output.

 The communications break value determines the mA output when a

slave fails to reply to a command within the Response time.

 For calibration instructions, see 4-20 mA Output Calibration,on

page 57.

Page 57

PD865 Snooper Modbus Serial Input Meter Instruction Manual 4-20 mA Output Calibration

 There is no need to recalibrate the 4-20 mA output when

first received from the factory.

 T he 4-20 mA output is factory calibrated prior to shipment.

The calibration equipment is certified to NIST standards.

The 4-20 mA output can be calibrated 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.

4-20 mA Output Calibration Procedure

1. Wire the PD865 4-20 mA output to a current loop that includes a power supply (internal or external 12 to 24 VDC), and the current input on the digital meter.

2. Turn on all devices. Allow for a 15 to 30 minute warm-up.

3. Go to the Advanced Features menu, and navigate to the Analog Output (Aout)/Calibration (Calib) menu and press Enter. Select Manual calibration (nmAn) and press Enter.

4. The display will show 4 nmA. The PD865 mA output should now be close to 4 mA. Press Enter and the display will show 04.0000. Enter the actual value read by the digital meter and press Enter.

5. The display will show 20 nmA. The PD865 mA output should now be close to 20 mA. Press Enter and the display will show

20.0000. Enter the actual value read by the digital meter and press Enter.

6. The PD865 will now calculate the calibration factors and store them.

Page 58

PD865 Snooper Modbus Serial Input Meter Instruction Manual Display Intensity (d-inty)

The Display Intensity function allows the selection of eight levels of intensity for various lighting conditions.

D-inty

int1 int8int2

Information (info)

The Information menu shows the firmware, version, and serial numbers.

info

sft055

0803

ver

1234

01.000

5678

Th ese num bers ar e f or il l ustrat ion only . Act ual

values may vary from t hose sh own. The serial nu m ber c an be up to 16 characters long.

The serial number only displays numbers. If non-numeric characters are present, they will be displayed as underlines.

Page 59

PD865 Snooper Modbus Serial Input Meter Instruction Manual

OPERATION

The PD865 meter is capable of operating as a Modbus Master, Slave or Snooper. As a Slave, the PD865 requires connection to a Master device: PLC, DCS, etc. As a Master, the PD865 interfaces up to eight slave devices. As a Snooper it can be connected anywhere in the RS-485 bus to read any of the variables being requested by the Master device.

Master and Slave Connections

The following figures show a few possible connection schemes.

Figure 12: PD865 Slave & Snooper Connected to a Master

Figure 13: PD865 Master Connected to a Smart Sensor & Chart

Recorder

Page 60

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Figure 14: PD865 Master Connected to a PD765 Meter

Figure 15: PD865 Master & Snoopers Connected to Multivariable

Level Transmitters

Page 61

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Figure 16: PD865 Master & Snoopers Connected to Level and

Temperature Sensors

Page 62

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Maximum/Minimum Readings

The primary function of the front panel buttons during operation is to display the maximum and minimum readings reached by the process or temperature inputs.

Present

Reading

2468 Hi lo

9865 201

10 Sec Time Out

1. Press Up arrow/Max button to display maximum reading since the last reset/power-up. The display will switch between Hi and the reading.

2. Press Up arrow/Max again to display the minimum reading since the last reset/power-up. The display will switch between Lo and the reading.

3. Press Enter/Ack to hold Max/Min display reading, the meter will continue to track new Max/Min readings.

4. If Enter/Ack is not pressed, the Max/Min display reading will time out after ten seconds and the meter will return to display the actual reading.

5. To reset the Max/Min value, press the Right arrow/Reset button while the Max/Min is being displayed. This will reset it to the present reading.

Page 63

PD865 Snooper Modbus Serial Input Meter Instruction Manual

TROUBLESHOOTING

If the meter is not working as expected, refer to the troubleshooting tips on page 68.

Determining Software Version

To determine the software version of the meter:

1. Go to the Information menu (info) in the Advanced Features menu and press the Enter/Ack button.

2. Press Enter/Ack to access the software number (SFT), version (UER), and serial number (Sn) information. Write down the information as it is displayed. Continue pressing Enter/Ack until all the information is displayed.

Reset Meter to Factory Defaults

When the parameters have been changed in a way that is difficult to determine what is 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, page 52.

2. Press Up arrow several times to go to the Information menu.

3. Press and hold Right arrow/Reset for five seconds, then press Enter/Ack when display flashes reset. Note: If Enter/Ack is not pressed within three seconds, display returns to meter Run.

4. The meter loads the factory default settings, and goes through an initialization sequence (same as on power-up).

Press and hold for 3 seconds

info

Press and hold for 5 seconds

Flashing

Display

reset

Meter

Reinitializes

Page 64

PD865 Snooper Modbus Serial Input Meter Instruction Manual Factory Defaults & User Settings

The following table shows the factory setting for most of the programmable parameters on the meter. Next to the factory setting, the user may record the new setting for the particular application. Note that all settings are loaded with a default value, even though some settings may not be used. For example, the Slave mode is the default setting, but all of the Master mode settings have their default values loaded.

Model: ______________ S/N: _______________ Date: _________

Parameter Display Default Setting User Setting

Mode Function Code Number of PVs Slave ID PV1 Register

Number PV1 Data Type

Byte Order Polling Time Slave Response

Timeout Baud Parity Byte-to-byte

timeout* Display decimal

point Input 1 Display 1 Input 2 Display 2

nmode

FunCode

Pv.nbr

Id-Pv1

Reg.Pv1

Data.1

1234

t-poll

t-resp

baud

parity

t-byte

dddd.dd

inp 1

dis 1

inp 2

dis 2

Master 03 1 247 40001

(5 digit) Short integer

(Binary & Signed) Big-endian

2.0 second

5.0 second 2400

Even

0.01 second 2 places

-199999

-1999.99 999999

9999.99

Page 65

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Parameter Display Default Setting User Setting

Input 3 Display 3 Input 4 Display 4 Input 5 Display 5 Input 6 Display 6 Input 7 Display 7 Input 8 Display 8 Input 9 Display 9 Input 10 Display 10 Input 11 Display 11 Input 12 Display 12 Input 13 Display 13 Input 14 Display 14 Input 15 Display 15 Input 16

inp 3

dis 3

inp 4

dis 4

inp 5

dis 5

inp 6

dis 6

inp 7

dis 7

inp 8

dis 8

inp 9

dis 9

inp 10

dis 10

inp 11

dis 11

inp 12

dis 12

inp 13

dis 13

inp 14

dis 14

inp 15

dis 15

inp 16

300.00

400.00

500.00

600.00

700.00

800.00

900.00

1000.00

1100.00

1200.00

1300.00

1400.00

1500.00

1600.00

Page 66

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Parameter Display Default Setting User Setting

Display 16 Relay 1 Action** Relay 1

Failsafe** Relay 1

On-Delay** Relay 1

Off-Delay** Relay 1 Break

Action** Relay 1 Set Relay 1 Reset Relay 2 Set Relay 2 Reset Relay 3 Set Relay 3 Reset Relay 4 Set Relay 4 Reset 4-20 mA Scale:

Display 1 4-20 mA Scale:

Output 1 4-20 mA Scale:

Display 2 4-20 mA Scale:

Output 2 Password

dis 16

act 1

fls 1

on 1

off 1

break1

Set 1

RSt 1

Set 2

RSt 2

Set 3

RSt 3

Set 4

RSt 4

dis 1

out 1

dis 2

out 2

pass

1600.00 Automatic

Off

0 seconds

Relay goes on

70.00

60.00

100.00

90.00

130.00

120.00

160.00

150.00

0.00

4.000 mA

200.00

20.000 mA 0000 (unlocked)

Page 67

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Advanced Features Display

Function Number of

Points Filter Bypass Cutoff 4-20 mA:

Data Source 4-20 mA:

Overrange 4-20 mA:

Underrange 4-20 mA:

Comm. Break 4-20 mA:

Maximum 4-20 mA:

Minimum*** Display intensity

Notes:

* The byte-to-byte timeout setting might be updated automatically depending on the baud rate selected and the previous timeout setting. The minimum timeout allowed is saved to memory if a lower value is entered (e.g. If user enters 0.00 with a baud rate of 300, 0.06 is saved).

** These defaults are the same for all four relays.

*** The guaranteed minimum output for the 4-20 mA is 1.000 mA. Lower values may be possible, but are not guaranteed.

funC

no pts

filter

bypass

CutofF

sourCe

O-rang

U-rang

break

nmax

nmin

inty

Linear

2 0

0.2%

0.00 (disabled) Display value

21.000 mA

3.000 mA

21.000 mA

23.000 mA

0.000 mA Level 6

Page 68

PD865 Snooper Modbus Serial Input Meter Instruction Manual

Troubleshooting Tips

Symptom Check/Action

No display at all. Not able to change setup or

programming, LoCd is displayed. Meter displays error message

during scaling (error). Master displays a different value

than PD865 display. PD865 Master displays a different

value than slave device. PD865 Snooper mode going into

communication break Display alternates between:

1. Hi and a number

2. Lo and a number

Display flashes -199999. Display flashes 999999.

Display response is too slow. Relay operation is reversed.

Relay and status LED do not respond to signal.

Meter is not communicating.

Meter display occasionally jumps to another value.

The display locks up or the meter does not respond at all.

Other symptoms not described above

Check power at power connector. Check fuses (not supplied). Meter is locked, enter correct four-digit password to unlock.

Check input points for similar values.

Check master data type setting. Make sure it matches the PD865 data type found in the Register Table. Check PD865 data type setting. Make sure it matches the slave data type.

Increase baud rate and/or poll time.

Press Menu to exit Max/Min display readings.

The data is less than the Input 1 value. Use a lower value for Input 1. The data is greater than the last Input point value. Use a higher value for the last Input point. Check filter and bypass values.

Check:

1. Fail-safe in Setup menu.

2. Wiring of relay contacts. Check:

1. Relay action in Setup menu.

2. Set and reset points. Check:

1. Serial cabling (swapped lines).

2. Slave ID, parity, and baud rate. Check that the polling time is not too fast for the chosen baud rate. For example, a polling time of 0.1 seconds is too fast for 2400 baud. Cycle the power to reboot the microprocessor.

Call Technical Support for assistance.

Page 69

Comments

Represents the display value without the decimal point. Decimal

point setting in 40013.

Represents the Maximum display value, excluding the decimal

point, since last power up or Max. Value reset. Decimal point

setting in 40013. Writing any value will reset the max to the

present display value.

Serial Input Meter Instruction Manual: Register Table

PD865 Snooper Modbus

Code(s)

Function

Data

Limits

Name Access

Relay acknowledge.

value, Serial settings, Unit address, byte-to-byte timeout, Number of scaling points, Slave Response

timeout, Poll Time, Brightness, Bypass, Cutoff, Filter, Float decimal point.

Communications Break value, Display Value 1, Display Value 2, Output 1, Output 2, Data (mA/bits), and

gain & offset calibration factors.

SLAVE MODE REGISTER TABLE

 40001 – 40008: Process Value (PV), Max PV, Min PV, relay status, reset max & min Display value, Alarm & Relay status,

 40009 – 40027: Initialize meter, Lock, Mode, Data Type, Display Decimal point, Linear/Square Root/Exponent, Exponent

 40101 – 40128: Relays; Set & Reset points, Operating Mode, Turn-on & Turn-off delays.

 40301 – 40317: 4-20mA output; Mode, Over-range value, Under-range value, Maximum allowed, Minimum allowed,

 49201 – 49215: Reserved for user data.

 40401 – 40464: Input and Display values for 2 – 16 point scaling.

 49101 – 49116: Product ID, Firmware Version, and Manufacturing Serial Number.

Long 03, 04, 16

Type

+999999

-199999 to

Read

Display

(0000–

40001 –

Write

value

40002

0001)

-199999 to

Read

Maximum

2 – 3

40003 –

Range

0 – 1

(hex)

Address

Number

Long 03, 04, 16

+999999

Write

value

Display

0003)

(0002–

40004

Page 70

Rly

0000

Comments

Represents the Minimum display value, excluding the decimal

point, since last power up or Min. Value reset. Decimal point

setting in 40013. Can be written to any value between –199999 to

+999999. Writing any value will reset the max to the present

display value.

Read alarm status and energized/non-energized status of relays.

Alarms are read only; the upper byte is ignored for writes. Writing

to a relay is only possible when the relay is in the Disabled mode.

Alm = Alarm. Rly = Relay.

Code(s)

Function

Data

Type

Limits

Range

Serial Input Meter Instruction Manual: Register Table

Name Access

Long 03, 04, 16

+999999

-199999 to

Read

Write

value

Display

Minimum

03, 04,

Bits

1 = In

Alarm

Write

Read both,

Relay

Alarm and

15 - 12 11 10 9 8 7 - 4 3 2 1 0

0000

Clear Relay n alarm condition. Set bit equal to 1 to acknowledge.

Only has effect on relays programmed to allow manual

acknowledging.

1 = relay

energized

Relays

Status

Alm = Alarm.

Bits 06

0x0000

to 0x0F00

Write

Only

Alarm

acknowled

0000 0000

15 - 12 11 10 9 8 7 - 4 3 - 0

0000

Write 0xFF00 to reinitialize the meter. Writing any other data has

no effect.

Integer 06

initialize.

0xFF00 to

Write

Only

meter

Initialize

Address

PD865 Snooper Modbus

Number

4 – 5

0005)

(hex)

(0004–

40005 –

40006

(0006)

40007

(0007)

40008

(0008)

40009

Page 71

Comments

See note 4.

This register can be read or written in Slave mode only. The mode

can be changed from Slave to Master or Snooper. See Table 6.

This Register is reserved for future use. Reading returns 0xffff and

writing to it has no effect.

See Bit Assignment Table 1.

See Bit Assignment Table 2. Selecting Square Root or Exponent

forces Register 40015 (number of points) to be 2.

Number of scaling points. This cannot be changed if the Transfer

Function is set to Square Root or Exponent.

03, 04, 06,

(Packed

0x0000 to

Read

03, 04, 06,

BCD)

Word;

bit flags

Not

0x9999

applicable

Read

Write

Code(s)

Function

Data

Limits

Serial Input Meter Instruction Manual: Register Table

Integer

Type

Range

03, 04, 06,

Word;

Not

Read

bit flags

applicable

Write

03, 04, 06,

0 to 5 Integer

Read

03, 04, 06,

0 to 2 Integer

2 to 16 Integer

Read

Write

Read

Write

Long 03, 04, 16 If Square Root is selected, this value is ignored.

0.5 to

Read

This is the timeout between bytes of a Modbus frame. It is

automatically changed to 1.5 * character time when the baud rate

is changed.

03, 04, 06,

2.99999

0 to 2.54 Integer

Read

Write

Name Access

PD865 Snooper Modbus

Lock

Mode

selection

Data Type

(0009)

(hex)

Address

40010

Number

(000A)

40011

(000B)

40012

Point

Display

Decimal

(000C)

40013

Transfer

Function

(000D)

40014

Number of

Points

(000E)

15 – 16

40015

40016 –

Byte-to-

Exponent

0010)

(000F –

40017

byte

40018

timeout

(0011)

Page 72

Comments

Corresponds to 0.0 to 25.5 seconds X3. Used in Slave mode as the

waiting time for new PV data.

Corresponds to 0.1 to 25.5 seconds. 0 is not allowed. Polling time

has to be greater than or equal to slave response time. Master

mode only.

8 is the brightest level.

Corresponds to 0.2 to 99.9%. If the input steps greater than the

bypass value, it will be displayed immediately, with no filtering

occurring. The number represents percent of full-scale. No effect if

filter = 0.

Display filtering. 0 = no filtering.

New = old + ((new - old)/Filter)

Represents the display value without the decimal point. A value of

000000 disables the cutoff.

See Bit Assignment Table 3.

Master mode: the address of the slave being read.

Slave mode: the PD865 address.

03, 04, 06,

2 to 999 Integer

Read

03, 04, 06,

0, 2 to 199 Integer

0 to 999999 Long 03, 04, 16

Read

Write

Read

Write

Code(s)

Function

Data

Type

Limits

Serial Input Meter Instruction Manual: Register Table

0 to 255 Integer

Range

Read

Write

1 to 255 Integer

Read

1 to 8 Integer

Read

Write

03, 04, 06,

bits

Integer:

Not

applicable

Read

Write

03, 04, 06,

1 to 247 Integer

Read

Write

Name Access

PD865 Snooper Modbus

40026

Settings

(0019)

Unit

40027

Address

(001A)

Slave

Timeout

Response

(0012)

(hex)

Address

40019

Number

LED

Poll Time

brightness

(0013)

40020

(0014)

40021

Bypass

(0015)

40022

Filter

(0016)

23 – 24

40023

Cutoff

(0017 –

40025

40024 –

Serial

0018)

Page 73

Function

Data

Limits

Comments

Code(s)

Type

Range

See Bit Assignment Table 1 for operating modes and bit

assignments.

03, 04, 06,

0 to 5 Integer

Relay 1 parameters. Set and reset points represent the display value without the

03, 04, 16

Long

(Set &

Reset)

999999

-199999 to

decimal point. See Bit Assignment Table 4 for operating modes and bit

assignments.

06,16

03, 04,

Long

bits

Word:

Integer

0 to 199

Bits 4, 2, 1,

Relay 2 parameters. Set and reset points represent the display value without the

decimal point. See Bit Assignment Table 4 for operating modes and bit

assignments.

06,16

03, 04,

03, 04, 16

Long

(Set &

Reset)

999999

Bits 6, 5

-199999 to

bits

Word:

Integer

0 to 199

Bits 4, 2, 1,

Bits 6, 5

Serial Input Meter Instruction Manual: Register Table

PD865 Snooper Modbus

Name Access

Address

Read

Write

Float

Point

Decimal

(hex)

40028

Number

Set-point

(001B)

100 – 101

Reset-point

0065)

(0064 –

Read

Write

delay

Turn-on

Turn-off

0067)

(0066 –

102 – 103

40101

40107

delay

Mode

104 (0068)

105 (0069)

Break

Comm.

106 (006A)

Set-point

Reset-point

006C)

(006B –

107 – 108

Turn-on

109 – 110

40108

Read

delay

Write

(006D –

delay

Mode

Turn-off

006E)

111 (006F)

40114

Break

Comm.

112 (0070)

113 (0071)

Page 74

Function

Data

Limits

Comments

Relay 3 parameters. Set and reset points represent the display value without the

decimal point. See Bit Assignment Table 4 for operating modes and bit

assignments.

06,16

03, 04,

Code(s)

Type

Range

03, 04, 16

Long

(Set &

Reset)

999999

-199999 to

bits

Word:

Integer

0 to 199

Bits 6, 5

Bits 4, 2, 1,

-199999 to

999999

Relay 4 parameters. Set and reset points represent the display value without the

decimal point. See Bit Assignment Table 4 for operating modes and bit

03, 04,

03, 04, 16

Long

Integer

(Set &

Reset)

0 to 199

assignments.

06,16

bits

Word:

Bits 4, 2, 1,

Selects output option and where the data source for the 4-20mA

output. See Bit Assignment Table 5.

03, 04, 06,

bits

Integer:

Not

Bits 6, 5

applicable

Serial Input Meter Instruction Manual: Register Table

PD865 Snooper Modbus

Name Access

Address

Number

(hex)

Set-point

Reset-point

0073)

(0072 –

114 – 115

Turn-on

116 – 117

40115

Read

Write

delay

(0074 –

delay

Mode

Turn-off

0075) 118 (0076)

40121

Break

Comm.

119 (0077)

120 (0078)

Set-point

Reset-point

007A)

(0079 –

121 – 122

Turn-on

123 – 124

40122

Read

delay

(007B –

Write

delay

Mode

Turn-off

007C)

125 (007D)

40128

Break

Comm.

127 (007F)

126 (007E)

Read

4-20mA out

300

40301

Write

– Mode

(012C)

Page 75

Comments

Corresponds to 0.000 to 23.999 mA. Because of hardware

variations, the actual output range is designed to be at least 1.000

to 23.000 mA.

Corresponds to 0.000 to 23.999 mA. Because of hardware

variations, the actual output range is designed to be at least 1.000

to 23.000 mA.

Corresponds to 0.000 to 23.999 mA. Because of hardware

variations, the actual output range is designed to be at least 1.000

to 23.000 mA.

Corresponds to 0.000 to 23.999 mA. Because of hardware

variations, the actual output range is designed to be at least 1.000

to 23.000 mA.

Corresponds to 0.000 to 23.999 mA. Because of hardware

variations, the actual output range is designed to be at least 1.000

to 23.000 mA.

4-20mA output scaling. Represents the display value without the

decimal point.

Limits

Serial Input Meter Instruction Manual: Register Table

PD865 Snooper Modbus

Function

Data

Name Access

Address

03, 04, 06,

Code(s)

Type

0 to 23999 Integer

Range

Read

Write

–

Overrange

4-20mA out

301

(012D)

(hex)

40302

Number

03, 04, 06,

0 to 23999 Integer

Read

Write

–

value

Underrang

4-20mA out

302

(012E)

40303

e value

03, 04, 06,

0 to 23999 Integer

Read

Write

value

4-20mA out

– Maximum

303

(012F)

40304

allowed

03, 04, 06,

0 to 23999 Integer

Read

Write

value

– Minimum

4-20mA out

304

(0130)

40305

03, 04, 06,

Long 03, 04, 16

0 to 23999 Integer

Read

Write

Break

allowed

– Comm.

4-20mA out

305

(0131)

40306

+999999

-199999 to

Read

Write

value

Value 1

– Display

4-20mA out

0133)

(0132 –

306 – 307

40308

40307 –

Page 76

Comments

4-20mA output scaling. Represents the display value without the

decimal point.

4-20mA output scaling. mA output at Display Value 1.

Corresponds to 0.000 to 23.999 mA.

4-20mA output scaling. mA output at Display Value 2.

Corresponds to 0.000 to 23.999 mA.

If 4-20mA output mode is set to “Serial Comm., mA” (0x83) this

range is at least 1.000 to 23.000 mA. If 4-20mA output mode is set to “Serial Comm., bits” (0x84), this

03, 04, 06,

0 to 23999 Integer

Read

4-20mA out

310

03, 04, 06,

0 to 23999 Integer

Read

Write

– Output 1

– Output 2

4-20mA out

311

(0136)

(0137)

Code(s)

Function

Data

Limits

Serial Input Meter Instruction Manual: Register Table

Name Access

Address

Long 03, 04, 16

Type

+999999

-199999 to

Range

Read

Write

Value 2

– Display

4-20mA out

0135)

(hex)

(0134 –

308 – 309

03, 04, 06,

Integer

0 to 23999

0 to 65535

Read

Write

– Data in

Data in bits

4-20mA out

312

(0138)

4-20mA output gain calibration factor to convert mA to DAC

counts.

Float 03, 04, 16

Ideal =

hardware.

Dependent

Read

Write

–

DAC

calibration:

4-20mA out

013A)

(0139 –

313 – 314

2.85.

Gain

PD865 Snooper Modbus

40310

40311

40309 –

Number

40312

40313

40314 –

40315

Page 77

Comments

–

4-20mA output offset calibration factor to convert mA to DAC

counts.

Input values for the scaling of 2 to 16 data points.

Number of points set in Register 40015.

Display values for the scaling of 2 to 16 data points.

Number of points set in Register 40015.

Code(s)

Function

Data

Type

Limits

Range

Serial Input Meter Instruction Manual: Register Table

Name Access

(hex)

Address

PD865 Snooper Modbus

Number

Float 03, 04, 16

hardware.

Dependent

Read

Write

–

DAC

calibration:

4-20mA out

013C)

(013B –

315 – 316

40317

40316 –

Ideal = 0.

Offset

Long 03, 04, 16

999999

-199999

Read

Write

Input 1

Input 16

401

0191)

(0190 –

400

40402

40401 –

433

01AF)

(01B0 –

(01AE –

430 – 431

432

40432

40431 –

40433 –

-199999

Display 1

01B1)

40434

Long 03, 04, 16

Read

Write

999999

Display 16

462 – 463

40463 –

(01CE –

40464

03, 04 8 characters indicating the product firmware number

ers

ASCII

charact

Not

applicable

Only

Read

Product

Identifier

9103

01CF)

9100 –

(238C –

49101

49104

238F)

Page 78

Comments

16 (max) characters indicating the manufacturing serial number

information.

This block of registers is reserved for user data.

Limits

Serial Input Meter Instruction Manual: Register Table

PD865 Snooper Modbus

Function

Data

Name Access

Address

Code(s)

Type

Number

Range

(hex)

03, 04 8 characters indicating the firmware version number

ers

ASCII

charact

Not

applicable

Only

Read

Version

Firmware

9107

2393)

9104 –

(2390 –

49105

49108

03, 04

ers

ASCII

charact

Not

applicable

Only

Read

Number

Mfg. Serial

9115

239B)

9108 –

(2394 –

49109

49116

Integer,

9200 –

Long

User

9215

49201

03, 04, 06, 16

Defined

User Data Read Write

(23F0 –

49216

bits

Word:

23FF)

Page 79

PD865 Modbus Snooper Serial Input Meter Instruction Manual

Note 1. Although there are no specific 3x registers listed, all 4x Registers are

Note 2. Limits or Range: Writing a value that is outside the parameters

Note 3. Data Types:

mirrored into 3x register space, and are therefore capable of being read by Modbus function 04 (Read Input Registers). Register addresses in Modbus messages are referenced to zero (0), while Register numbers are referenced to one (1). For example, Register number 40100 is sent in the Modbus message as 0x0063 (100-1 = 99 ≡ 63 hex). If two addresses are shown separated by a “ – ”, they form a register pair to make the parameter into a 4-byte (32 bit) value.

range will force it to be limited to the closest value within the range. For example; if the range is -1.99 to +1.99 and the value sent is 3.21, the value used is 1.99, or if -4.00 is sent, the value used will be -1.99. Exceptions are noted in the comments.

Data format is highest byte first. Word = 16 bit Integer = -32768 to 32767 Long = -2,147,483,648 to 2,147,483,647 Float = IEEE floating point format, 4 bytes ”Display decimal point setting in 40013.” These values represent the number without regard to the decimal point. The decimal point setting can be found in Holding Register 40013. For example, if the number

12.34 is displayed, a read of 40001-40002 will return 1234 (0x000004D2). Register 40013 will contain 2 (0x0002) to indicate a decimal point setting of two places to the right of the decimal point.

Examples using integer and long (register values are shown in hexadecimal):

Displayed

Process Value

1.234 0000 04D2 0003

12.34 0000 04D2 0002

123.4 0000 04D2 0001

-123.4 FFFF FB2E 0001

40001 - 40002

40013

Page 80

PD865 Modbus Snooper Serial Input Meter Instruction Manual

Float decimal point setting is found in Holding Register 40028.

Examples using Float (register values are shown in hexadecimal):

Displayed

Process Value

1.234 3F9D F3B6 0003

12.34 4145 70A4 0002

123.4 42F6 CCCD 0001

-123.4 C2F6 CCCD 0001

Note 4. A read of the Lock register will return 0x0000 if the meter is unlocked,

otherwise it will return 0xFFFF to indicate a locked meter. To unlock, the correct lock number must be written, which will then clear the lock number to 0x0000. If the wrong lock number is written, the reply will return 0xFFFF. If the correct lock number is written, the reply will be 0x0000. An unlocked meter can be locked by writing any non-zero value (from 1 to 9999).

Note 5. For the complete floating point standard, see IEEE 754-

1985 Standard for Binary Floating-Point Arithmetic.

40001 - 40002

40013

Page 81

PD865 Modbus Snooper Serial Input Meter Instruction Manual

Bit(s) 15 – 3 2 – 0

Description 0 – 0 Decimal

0 = dddddd 1 = ddddd.d 2 = dddd.dd 3 = ddd.ddd



4 = dd.dddd 5 = d.ddddd 6 = dddddd 7 = dddddd

Table 2. Transfer Function

The exponent is programmable from 0.5 to 2.99999.

Bit(s) 15 – 2 1 – 0

Description 0 – 0 Transfer Function

00 = Linear



01 = Square Root 10 = Exponent

Page 82

PD865 Modbus Snooper Serial Input Meter Instruction Manual

Table 3. Serial Settings

Note that the Bus Type is not implemented in either hardware or firmware in this version.

Bit(s) 15 – 8 7 6 5 – 4 3 2 – 0

Description 0 – 0 Bus Type 0 Parity 0 Baud

0 = 300

0 = RS232



or RS422

1 = RS485

0 = None 1 = Odd 2 = Even 3 = Even

1 = 600 2 = 1200 3 = 2400 4 = 4800 5 = 9600 6 = 19200 7 = 9600

Table 4. Relay Configuration (40107, 114, 121, 128)

When a relay has been disabled, it can be directly controlled using Register 40007.

Bit(s) 15 – 7 6 – 5 4 3 2 – 0

Description 0 – 0 Comm. Break Fail-safe 0 Mode

0 = Auto 1 = Auto/Manual 2 = Manual

0 = No Action



1 = On 2 = Off

0 = Normal 1 = Fail-safe

3 = Manual with Reset 4 = Alternating Pump 5 = Unused 6 = Unused 7 = Disabled (off)

Page 83

PD865 Modbus Snooper Serial Input Meter Instruction Manual Table 5. 4-20mA Output Modes

For the Serial Communications sources: Register 40313 holds the data, either as μA (0 to 23999 Ξ 0.000 to 23.999 mA) or DAC bits (0 to 65535). The DAC (Digital to Analog Converter) used for the 4-20 mA generation is updated whenever data is written to Register

40313. For any of the Display value sources: The DAC is updated when the

Display value is updated. The actual 4-20 mA range is limited due to component tolerances,

but is guaranteed by design to be at least from 1.000 to 23.000 mA.

Bit(s) 15 – 3 2 – 0

Description 0 – 0 4-20 mA Data Source

0 = Display value 1 = Max Display value



2 = Min Display value 3 = Serial Communications: mA. 4 = Serial Communications: bits. 5 to 7 = Unused.

Table 6. Mode Selection (40011)

Bit(s)

Description

7 6 – 4 3 2 1 – 0

5 or 6

Digit

0 = 5 digit (x0001 x9999)

1 = 6 digit (x00001 x65536)

0 – 0

Function

Code

0 = 03 1 = 04 (Master/

Snooper)

0 Mode

0 = Master 1 = Slave 2 = Snooper 3 = Defaults to

Master

Page 84

PD865 Modbus Snooper Serial Input Meter Instruction Manual

How to Contact Precision Digital

 For Technical Support:

Call: (800) 610-5239 or (508) 655-7300 Fax: (508) 655-8990 Email: [email protected]

 For Sales Support or to place an order:

Call: (800) 343-1001 or (508) 655-7300 Fax: (508) 655-8990 Email: [email protected]

 For the latest version of this manual please visit:

www.predig.com

LIM865_E

SFT055 Ver 1.1 & up

01/12