Vishay DXP10, DXP15 Operator's Manual

WEIGH SYSTEM TECHNOLOGY

BLH

DXP10/15 Weigh Transmitters

Operator’s Manual

TM002

RevG

6/1/11

Doc 35102

NOTICE

BLH makes no representation or warranties of any kind whatsoever with respect to the
contents hereof and specifically disclaims any implied warranties or merchantability or
fitness for any particular purpose. BLH shall not be held liable for errors contained herein
or for incidental or consequential damages in connection with the furnishing,
performance, or use of this publication or its contents.

BLH reserves the right to revise this manual at any time and to make changes in the
contents hereof without obligation to notify any person of such revision or changes.

Call [phone] for BLH Field Service

Table of Contents

SECTION 1. General Information ...................................................................................................................... 1-1

1.1 INTRODUCTION ...................................................................................................................................... 1-1

1.1.1 General Description. ............................................................................................................................. 1-1

1.1.2 Standard Instrument. ............................................................................................................................ 1-1

1.2 OPTIONS ................................................................................................................................................. 1-1

1.2.1 Mounting Options. ................................................................................................................................ 1-1

1.2.2 Optional Terminal Computer Interface. ................................................................................................ 1-1

1.2.3 Optional Modbus RTU Interface. .......................................................................................................... 1-2

1.2.4

Optional Fisher ProVox Protocol .......................................................................................................... 1-2

1.2.5 Optional Allen-Bradley Remote I/O ...................................................................................................... 1-2

1.2.6 Analog Option. ...................................................................................................................................... 1-2

1.2.7 Software Filter Option. .......................................................................................................................... 1-2

1.3 DXp-10/15 SPECIFICATIONS ................................................................................................................. 1-2

1.4 ORDERING SPECIFICATIONS ............................................................................................................... 1-4

1.5 WARRANTY POLICY ............................................................................................................................... 1-4

1.6 FIELD ENGINEERING ............................................................................................................................. 1-4

SECTION 2. Installation..................................................................................................................................... 2-1

2.1 INTRODUCTION ...................................................................................................................................... 2-1

2.1.1 General. ................................................................................................................................................ 2-1

2.2 MOUNTING .............................................................................................................................................. 2-1

2.2.1 Standard Units. ..................................................................................................................................... 2-1

2.2.2 Explosion-Proof and Division 2 Options. .............................................................................................. 2-1

2.3 ELECTRICAL ........................................................................................................................................... 2-2

2.3.1 Transducer Inputs. ................................................................................................................................ 2-2

2.3.2 Serial Communication. ......................................................................................................................... 2-2

2.3.3 Analog Output. ...................................................................................................................................... 2-3

2.3.4 Mains (AC) Power (Figure 2-4)............................................................................................................. 2-3

2.3.5 Auxiliary I/O Port. .................................................................................................................................. 2-3

SECTION 3. Configuration ................................................................................................................................ 3-1

3.1 GENERAL ................................................................................................................................................ 3-1

3.2 SET-UP .................................................................................................................................................... 3-1

3.2.1 Power Selection .................................................................................................................................... 3-1

3.2.2 Excitation Voltage. ................................................................................................................................ 3-1

3.2.3 Serial Format, Address, and Baud Rate. .............................................................................................. 3-1

3.2.4 Input Range Selection. ......................................................................................................................... 3-1

3.3 CALIBRATION .......................................................................................................................................... 3-1

iii

3.3.1 Digital Calibration. ................................................................................................................................ 3-1

3.3.2 Analog Calibration. ............................................................................................................................... 3-2

3.3.3 Monitor Mode Calibration. .................................................................................................................... 3-2

3.3.4 LCp-40 Calibration. ............................................................................................................................... 3-2

3.4 CHECK CAL ............................................................................................................................................. 3-5

3.5 FILTER SELECTION ................................................................................................................................ 3-6

3.5.1 Standard Filter. ..................................................................................................................................... 3-6

3.5.2 Optional Digital Filtering. ...................................................................................................................... 3-6

3.6 Factory Default Calibration ....................................................................................................................... 3-7

SECTION 4. Serial Communication .................................................................................................................. 4-1

4.1 GENERAL ................................................................................................................................................ 4-1

4.1.1 LCp-40 Digi System Network. .............................................................................................................. 4-1

4.1.2 Standard Simplex Output (Continuous Output). ................................................................................... 4-1

4.1.3 Computer/Terminal Interface (Optional). .............................................................................................. 4-2

4.1.4 MODBUS BTU Protocol (Optional). ..................................................................................................... 4-4

4.1.5 Fisher ProVox Protocol (Optional) ........................................................................................................ 4-7

4.1.6 Allen-Bradley Remote I/O (Optional). ................................................................................................... 4-8

SECTION 5. Operation ...................................................................................................................................... 5-1

5.1 GENERAL ................................................................................................................................................ 5-1

5.2 GROSS WEIGHT WEIGHING ................................................................................................................. 5-1

5.3 ZERO OPERATION ................................................................................................................................. 5-1

5.4 NET WEIGHT WEIGHING ....................................................................................................................... 5-1

5.5 TARE OPERATION .................................................................................................................................. 5-1

5.6 ERROR DETECTION ............................................................................................................................... 5-1

5.7 CHECK CAL OPERATION ....................................................................................................................... 5-1

iv

SECTION 1. General Information

1.1 INTRODUCTION

1.1.1 General Description

The DXp-10 and DXp-15 (Figure 1-1) are
microprocessor based weight transmitters. DXp­10/15 transmitters sum and convert the millivolt
signal from up to four strain gage type load cells
into a digital and/or analog voltage or current
signal (up to eight cells can be summed using
an external 308A summing unit). Bridge
excitation voltage is factory selectable for 10 or
15 volts. Units are available in NEMA 4, NEMA
4X or explosion proof enclosures for field
mounting. The unit operates from either 110 or
220 VAC at 50/60 Hz, and is equipped with
screw terminal connections for power input, and
serial/analog outputs. Set-up and calibration is
per-formed using three internal switches (see
SECTION III). Communication baud rate and
instrument address values are selected via a
bank of internal DIP switches (see SECTION
III).

Class I, II, Division 2, Group A-G hazardous
location requirements and are optionally
available with FM and CSA approvals and
certifications.

1.2 OPTIONS

1.2.1 Mounting Options

For corrosive, hose down, or sanitary
environments, a NEMA 4X stainless steel
enclosure is available. An explosion proof
enclosure is available for Class I, II, Division 1,
Group B-G locations. Note: BLH 404 or 405
Intrinsic Safety Barriers must be specified for
weigh systems located in a Division I area.

The DXp-10 Transmitter performance
specifications are designed for inventory and
other static weighing applications where
moderate resolution and speed is required. The
DXp-15 Process Transmitter is equipped with
high performance circuitry that provides the
greater resolution and speed for dynamic
process applications. Externally and in regard to
set-up and operation, each model is identical

Using RS 485 serial communication protocol, up
to sixteen DXp transmitters can be networked to
an LCp-40, 41, or 42 Network Controller. The
serial format can also be configured to provide
point to point or network communication to a
customer supplied computer.

1.1.2 Standard Instrument

The standard instrument includes an RS 485
serial port with BLH Digi-System network or a
simplex output protocols, a four cell summing
circuit, 10 or 15 volt excitation, averaging filter,
and a NEMA 4 mild steel, painted enclosure.
Standard instruments are designed to meet

Figure 1-1. DXp-10 Weight Transmitter

1.2.2 Optional Terminal Computer
Interface.

The terminal/computer interface option provides
a simple mnemonic half-duplex ASCII
communications protocol via a built-in macro
language consisting of 1 to 3 character command
strings (reference Table 4-3).

This powerful feature allows direct keyboard
control (using easily remembered commands) of

1-1

DXp-10/15 calibration, and programming or
recall of weight variables (gross, net, tare, zero,
etc.) An on-line help function is available by
transmitting an ASCII Ir.

Easily learned macro language syntax greatly
simplifies the writing of a host computer
communication interface (customer supplied).

1.2.3 Optional Modbus RTU
Interface.

The Modbus interface option provides a simple
seamless communication link to any PC, PLC or
DCS with a mod-bus RTU Driver Option. Use of
this industry standard protocol (see paragraph

4.1.4) eliminates the requirement for custom

software driver development.

1.2.4

DXp-15 transmitters may be ordered with the
Fisher ProVox protocol. ProVox protocol allows
the DXp-15 to interface directly with a Fisher
ProVox distributed control system (DCS).

Optional Fisher ProVox
Protocol

1.2.5 Optional Allen-Bradley Remote
I/O

Optional Allen-Bradley Remote I10 (RIO) allows
13Xp¬15 transmitters direct access to a PLC
master processor. In essence, DXp-15
transmitters become direct coprocessors with
the PLC. DXp-15 data is read directly into the

main ladder logic program without using BCD or
serial interface cards. A simple three wire RIO
network connection ties all units together, even if
multiple DXp15s are used. Within the RIO
network link, each DXp-15 is addressed as 1/4
'logical rack'. Since a PLC logical rack consists
of 128 input and 128 output bits (or points), DXp
units communicate 32 input and 32 output bits;
1/4 logical rack format. For a full description of
logical rack addressing and data
communications formatting, reference the Allen
Bradley Remote I/O technical manual, BLH part
number TM010.

1.2.6 Analog Option.

An optional analog output provides both a 4-20 mA
and a 0-10 VDC output representing the gross
weight value. The circuit uses a 12 bit D-A
converter providing up to 4096 counts of resolution.
The current output drives up to a 1000 ohm load
and the voltage output will operate with a 25,000
ohm minimum load resistance.

1.2.7 Software Filter Option.

The digital filtering option offers eight software
filtering selections. The filter algorithms dampen
noise by averaging successive A-D conversions.
Digital filtering allows East response to true
weight changes by setting limits on averaging
based upon the magnitude of signal change.
Filter selections are presented in SECTION III.
Note: BLH tech note TD-071 provides a full
discussion of filter operation.

1.3 DXp-10/15 SPECIFICATIONS

PERFORMANCE

Resolution:
DXp-10 20,000 counts
DXp-15 50,000 counts
Sensitivity
DXp-10 1.0 μV/count

DXp-15 0.5 μV/count
Full Scale Range 25 of 35 mV (selectable)
Dead Load Range 100%
Input Impedance 10 M-ohms, max.
Load Cell Excitation 10 V for up to eight 350 ohm load cells (250 mA)
(Factory Selectable) 15 V for up to six 350 ohm load cells (250 mA)
Linearity ± 0.01% of full scale

1-2

Temperature Coefficient

Span 2ppm/°C
Zero ± 2ppm/°C
Common Mode Rel. 100 db or better at or below 35Hz
Normal Mode Rej. 100 db or better at or below 35Hz
Conversion Speed DXp-10 400 msec

DXp-15 50 msec

Environment

Operating Temperature -10 to 55°C (12 to 131°F)
Storage Temperature -20 to 85°C (-4 to 185°F)
Humidity 5 to 90% rh, non-condensing
Voltage 117/230 1: 15% 50/60 Hz
Power 10 watts max
Parameter Storage EEPROM
EMVRFI Shielded from typical industrial interference

ENCLOSURE

Dimensions (NEMA 414X) 11.5 x 8.0 x 4.3 HWD
Explosion Proof 12.875 x 10.875 x 8.188 HWD

OPTIONS

Isolated Analog Output

Type 12 bit Digital to Analog Conversion
Voltage 0 to 10 volt (25K ohm min load)
Current 4 to 20 mA (1000 ohm max load)

SERIAL COMMUNICATION

LCp-40 Network (Standard)

Type RS 485 Half Duplex (Multi-Drop)
Baud 56.7k

Simplex Data Output (Standard)

Interface Type RS 485 (Simplex)
Data Format Simplex ASCII Data

7 Data Bit
Even Parity
1 Stop Bit

Terminal/Computer Interface (Optional)

Interface Type RS 485 Half Duplex (Standard)
Baud 1200 or 9600
Protocol Duplex Command/Response Format

MODBUS RTU Protocol (Optional)
Fisher ProVox Protocol (Optional)
Allen-Bradley Remote I/O (Optional)
Consult factory for details

1-3

1.4 ORDERING SPECIFICATIONS

DXp-10 or DXp-15 [M]-[C]-[P]-[S] Includes: RS 485 Serial Output

[M] Mounting

(1) NEMA 4 Painted — standard
(2) NEMA 4X Stainless Steel
(3) NEMA 7 & 9 Explosion-Proof Class I, H, Div. 1,2 Grp. B—G
(8) #1 & FM/CSA Approved [Class l, Div 2, Group ABCD FG]
(9) #2 & FM/CSA Approved [Class l, Div 2, Group ABCD FG]

[C] Communication

(1) RS 485 LCp-40 Network — standard
(2) RS 485 LCp-40 Network and Terminal/Computer Interface
(4) Allen Bradley Remote I/O (DXp-15 only)
(5) MODBUS RTU Protocol (D4-15 only)

[P]Process Output

(1) No Process Output — standard
(2) 0-10 V & 4-20 mA analog

[S]Software

(1) Standard
(2) Dynamic Digital Filtering (DXp-15 only)

apply beyond their normal span of life to any

1.5 WARRANTY POLICY

BLH warrants the products covered hereby to be
free from defects in material and workmanship.
BLH's liability under this guarantee shall be
limited to repairing or furnishing parts to replace,
f.o.b. point of manufacture, any parts which,
within three (3) years from date of shipment of
said product(s) from BLH's plant, fail because of
defective workmanship or material performed or
furnished by BLH. As a condition hereof, such
defects must be brought to BLH's attention for
verification when first discovered, and the
material or parts alleged to be defective shall be
returned to BLH if requested. BLH shall not be
liable for transportation or installation charges,
for expenses of Buyer for repairs or
replacements or for any damages from delay or
loss of use for other indirect or consequential
damages of any kind. BLH may use improved
designs of the parts to be replaced. This
guarantee shall not apply to any material which
shall have been repaired or altered outside of
BLWs plant in any way so as, in BLH's
judgment, to affect its strength, performance or
reliability, or to any defect due in any part to
misuse, negligence, accident or any cause other
than normal and reasonable use, nor shall it

materials whose normal span of life is shorter
than the applicable period stated herein. In
consideration of the forgoing guarantees, all
implied warranties are waived by the Buyer, BLH
does not guarantee quality of material or parts
specified or furnished by Buyer, or by other
parties designated by buyer, if not manufactured
by BLH. If any modifications or repairs are made
to this equipment without prior factory approval,
the above warranty can become null and void.

1.6 FIELD ENGINEERING

The field service department at BLH is the most
important tool to assure the best performance
from your application. The expertise and
understanding of BLH's Field Engineers can
solve even the most perplexing installation
problem. Precise calibration and start-up
procedures, performed by a qualified,
experienced field engineer, assure not only the
reliability of BLH components, but the integrity of
the entire weigh system.

Call (Factory Number) [phone]

Ask for Field Service

Canada [phone]

1-4

SECTION 2. Installation

2.1 INTRODUCTION

2.1.1 General.

The DXp-10/15 is designed to 'installed within the
length of the load cell(s) cable which is normally
35 ft or less. The standard NEMA 4 or optional
NEMA 4X enclosures are suitable for an outdoor
or wash down type environment. Both enclosures
are provided with pre-punched holes for
installation of conduit or cable fittings and holes for
mounting to a bracket or wall.

2.2 MOUNTING

2.2.1 Standard Units.

The NEMA 4 and NEMA 4X enclosures are
equipped with four pre-punched holes for
mounting to a wall or bracket. A U-bolt can be
used for mounting to a pipe support. The

instrument should be installed in a vibration-free
location within the normal length of the load cell
cables. If conduit is used, drains should be
provided to reduce the possibility of condensate
entering the enclosure. Outline dimensions for the
standard DXp¬10/15 transmitter are presented in
Figure 2-1.

2.2.2 Explosion-Proof and Division 2
Options.

DXp units may be ordered with an optional
explosion-proof enclosure for use in Division I
hazardous locations. Dimensions for the optional
explosion-proof enclosure are provided in
Appendix C.

For Division 2 applications, FM approved units are
available as non-incendive devices in NEMA 4/4X
enclosures with dimensions identical to those
presented in Figure 2-1.

Figure 2-1. DXp-10 Outline Dimensions

2-1

Figure 2-2. Load Cell Connections.

2.3 ELECTRICAL

2.3.1 Transducer Inputs.

Up to four load cells can be connected to the
summing circuit within the DXp. Connect individual
load cells directly to the circuit board connectors
as shown in Figure 2-2. Excitation and signal
connection locations are dearly marked according
to function and standard color code.

If more than four cells are required, an external
308A summing junction box must be used. Make
all load cell connections in the 3084 unit, not the
DXp-10/15. Connect the output leads of the 3084
summing box to the load cell #1 terminal blocks in
the DXp. Sense leads from the 3084 must be
connected to the sense terminal blocks in the
DXp-10/15 (Figure 2-2). Jumpers JF1 and JP2
must be removed.

2.3.2 Serial Communication.

If a deadweight or substitution method of
calibration is being used, the load cal cable can be
shortened as required. The leads should be re­tinned before the final connection is made.

NOTE: If tension or universal load cells are used,
red (-signal) and white (+ signal) leads may need
to be reversed.

A terminal connector is provided for RS 485 wire
connections (Figure 2-3). Multiple DXp
transmitters, networked together, are wired in a
parallel configuration with a termination jumper
installed on the last instrument. A pair of twisted
wires (14-20 gauge) is all that is required for
interconnection. Communication lines should not
be run near ac voltage power lines.

Figure 2-4. Ac Power Connections and Fuse

2-2

2.3.3 Analog Output.

When the analog option is installed (shown,
Figure 2-3), a three position terminal connector
is provided for 4-20 mA, 0-10 V, and common
connections. As with serial communication, the
wiring should be routed away from ac power
lines and other sources of EMI. The current
output is essentially immune to noise and can be
transmitted long distances. The voltage output is
susceptible to EMI/RFI and should be used only
for short distances.

2.3.4 Mains (AC) Power (Figure 2-4).

A screw terminal is provided for permanent
transmitter power connection. DXp transmitters

can be switch selected to operate at 115 or 220
VAC (see SW1, Figure 2-4). Before connecting
power to the unit, verify that the proper power
selection has been made. The two position
terminal block is equipped with a clear plastic
cover to prevent operator injury. Cable can be
either solid or stranded 12 or 14 gage with a
ground conductor.

The transmitter is protected with a 114 amp slow
blow fuse, located adjacent to the mains
terminal block. If the fuse opens, replace it with
the same type and current rating.

2.3.5 Auxiliary I/O Port.

The auxiliary I/0 port connection is a factory test
port and is not useful to an operator.

2-3

SECTION 3. Configuration

3.1 GENERAL

Set-up and calibration of the DXp-10/15 is
accomplished by an operator without
programming using the DIP switches, push­buttons, and toggle switches within the unit.
Units connected to an LCp-40 or computer ter­minal can be set-up and calibrated remotely via
the serial port (see Appendix E).

3.2 SET-UP

3.2.2 Excitation Voltage.

All units are shipped from the factory set for 10
volt excitation.

3.2.3 Serial Format, Address, and
Baud Rate.

DIP switch selections for transmitter address,
baud rate and serial interface format are
presented and defined in SECTION IV, Serial
Communication.

3.2.1 Power Selection

All units are shipped from the factory configured
for 115 VAC operation. To change the voltage
selection to 230 VAC, change SW1 (see Figure
2-4) to the 230V setting. The unit will operate
within specification at 50 or 60 Hz.

3.2.4 Input Range Selection.

Units are shipped configured for a 25 mV input
range. To increase this range to 35 my, remove
the jumper shunt from JP2 on the A-D converter
board as shown in Figure 3-1 (see Appendix A
photo for A-D board location).

Figure 3-1. 35 mV Input Conversion Instructions

3.3 CALIBRATION

Note: All switches mentioned in paragraphs

3.3.1 – 3.3.4 are depicted in Figure 3-1.

3.3.1 Digital Calibration.

The transmit only serial output can be digitally
calibrated using the DIGITAL selector, 1NC/DEC

and ENTER switches mounted on the DXp­10/L5 control panel. For those systems where
applying a full capacity dead weight or input
signal is not practical, the DXp-10/15 will
automatically calculate a linear full span
calibration based on a single span point. See
Table 3-1 for instructions.

3-1

3.3.2 Analog Calibration.

The analog output is calibrated independently of
the digital calibration and can be set using span
points anywhere between zero and full scale
capacity. The 0-10 V and 4-20 mA outputs CAN
NOT be calibrated independently. See Table 3-2
for complete analog calibration instructions.

3.3.3 Monitor Mode Calibration.

The terminal/computer interface option enables
the DXp-101L5 to be calibrated remotely from a
host computer or terminal. The monitor mode
functionally accesses the software routines used
to provide remote access via the keypad of an
LCp-40 Network Controller. In response, the
DXp-10/15 transmits two lines of information
similar to the two line display on an LCp-40. In
this mode the capacity, graduations, decimal

point, 5 point linearization and other values can
be established from the host device. Help
messages also can be accessed at any time to
aid in the set-up process. The procedure
recorded in Table 3-3 shows the command
sequence required to perform remote
calibration. Consult SECTION IV for serial
communication details.

3.3.4 LCp-40 Calibration.

When networked to an LCp-40, 41, or 42
controller, the DXp-10/15 can be remotely
calibrated using the controller display and
keypad. In this configuration, up to five
linearized span points can be entered. Appendix
E presents step by step flow diagrams for
remote LCp-40 calibration and parameter set­up.

Figure 3-2. Set-up and Calibration Switch Locations (Shade)

Table 3-1. DXp-10 Digital Calibration

Instructions

[1]. Connect Load Cells and Remote
Terminal.

Install the load cells and wire them to the
DXp-10/15. Connect the RS 485 serial
output to a compatible terminal/readout
device. Select a compatible serial output
format and establish that the
communication link is operating (paragraph

3.2.3).

[2]. Establish Zero.

Make sure that all dead weight (vessel,
mixer, pipes, etc) is applied as it will be
during normal operation. Move the five
position slide switch (Figure 3-2) to the
digital zero position. Press the enter
button to acquire zero and wait
approximately 5 seconds for the zero
reference value to be stored. The red
OPTION STATUS LED will resume
flashing when the storage procedure is
complete.

3-2