Hardy Instruments A Series Specification sheet

HI 1756-WS & HI 1756-2WS
WEIGH SCALE MODULE
Series A
OPERATION AND INSTALLATION
MANUAL
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9440 Carroll Park Drive, Suite 150
San Diego, CA 92121
Phone: [phone]
FAX: [phone]
Web-Site: http://www.hardyinst.com
Hardy Instruments Document Number: 0596-0247-01 Rev K
Copyright November 2000 Hardy Instruments, Inc. All Rights Reserved. Printed in the U.S.A. (941028)

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tions. We're ready to support you with:
•Installation and start-up
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•Emergency troubleshooting and repair
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Table of Contents
i
Table of Contents
OVERVIEW - - - - - - - - - - - - - - - - - - - - - - - - - - - -1-1
A Brief Description of Chapter 1- - - - - - - - - - - - - - - - - - -1-1
About This Manual - - - - - - - - - - - - - - - - - - - - - - - - -1-1
Description - - - - - - - - - - - - - - - - - - - - - - - - - - - - -1-2
WAVERSAVER®- - - - - - - - - - - - - - - - - - - - - - - - - -1-3
C2® Calibration - - - - - - - - - - - - - - - - - - - - - - - - - -1-3
IT®- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -1-3
Excitation Monitor - - - - - - - - - - - - - - - - - - - - - - -1-3
Digital Volt Meter (DVM) - Optional - - - - - - - - - - - - - - -1-4
Return to Zero Test - Optional - - - - - - - - - - - - - - - - -1-4
Weighing System Tests - Optional - - - - - - - - - - - - - - -1-4
Auto Zero Tracking - - - - - - - - - - - - - - - - - - - - - - - - -1-5
CHAPTER 2 - SPECIFICATIONS- - - - - - - - - - - - - - - - - -2-1
A Brief Description of Chapter 2- - - - - - - - - - - - - - - - - - -2-1
Specifications for a Standard HI 1756-WS (-2WS) Weigh
Scale Module- - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
Channels- - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
Conversion Rate - - - - - - - - - - - - - - - - - - - - - - - -2-1
Averages- - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
Resolution - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
Input - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
Non-Linearity - - - - - - - - - - - - - - - - - - - - - - - - - -2-1
WAVERSAVER®- - - - - - - - - - - - - - - - - - - - - - - -2-1
Excitation Monitor - - - - - - - - - - - - - - - - - - - - - - -2-1
Common-Mode Rejection- - - - - - - - - - - - - - - - - - - -2-1
Common-Mode Voltage Range - - - - - - - - - - - - - - - - -2-2
Backplane Input Voltage - - - - - - - - - - - - - - - - - - - -2-2
Backplane Current Load - - - - - - - - - - - - - - - - - - - -2-2
Backplane Power Load - - - - - - - - - - - - - - - - - - - - -2-2
C2 Calibration Input - - - - - - - - - - - - - - - - - - - - - -2-2
Cable lengths- - - - - - - - - - - - - - - - - - - - - - - - - -2-2
Load Cell Excitation - - - - - - - - - - - - - - - - - - - - - -2-2
C2 Calibration Output- - - - - - - - - - - - - - - - - - - - - -2-2
Environmental Requirements - - - - - - - - - - - - - - - - - - - -2-2
Temperature Coefficient - - - - - - - - - - - - - - - - - - - -2-2
Operating Temperature Range - - - - - - - - - - - - - - - - -2-2
Storage Temperature Range - - - - - - - - - - - - - - - - - -2-2
Humidity Range - - - - - - - - - - - - - - - - - - - - - - - -2-2
Approvals - - - - - - - - - - - - - - - - - - - - - - - - - - -2-2
Digital Voltmeter - - - - - - - - - - - - - - - - - - - - - - - -2-2

HI 1756-WS WEIGH SCALE MODULE
ii
Optional Equipment- - - - - - - - - - - - - - - - - - - - - - - - -2-3
1756 RTA (Remote Termination Assembly - - - - - - - - - - -2-3
RTA Cable Assemblies - - - - - - - - - - - - - - - - - - - - -2-3
HI 215IT Series Junction Box - - - - - - - - - - - - - - - - - -2-3
Default Parameters - - - - - - - - - - - - - - - - - - - - - - - - -2-3
CHAPTER 3 - INSTALLATION - - - - - - - - - - - - - - - - - - -3-1
A Brief Description of Chapter 3- - - - - - - - - - - - - - - - - - -3-1
Unpacking - - - - - - - - - - - - - - - - - - - - - - - - - - - - -3-1
Installing the HI 1756-WS (-2WS) into an Allen-Bradley
ControlLogix Processor or Allen-Bradley Remote Rack - - - - - - -3-1
Installing the HI 1756-WS (-2WS) into the ControlLogix Chassis -3-2
Removing the Module from the Chassis - - - - - - - - - - - - - - -3-3
Installing the Module I/O Connector - - - - - - - - - - - - - - - - -3-4
About the Module I/O Connector3-4
Load Cell Wiring Diagrams - - - - - - - - - - - - - - - - - - - - -3-6
Industry Standard Load Cells - - - - - - - - - - - - - - - - - -3-6
Hardy Load Sensor with C2- - - - - - - - - - - - - - - - - - -3-6
HI 1756 Remote Terminal Assembly (HI 1756-XX-RT)- - - - - -3-7
RTA Cable Assembly- - - - - - - - - - - - - - - - - - - -3-8
Hardy HI 215IT Junction Box - - - - - - - - - - - - - - - - - -3-9
CHAPTER 4 - SETUP4-1
A Brief Description of Chapter 4- - - - - - - - - - - - - - - - - - -4-1
Power Check - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-1
LEDS- - - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-2
Scale Data LEDs - - - - - - - - - - - - - - - - - - - - - -4-2
OK Module Status LED - - - - - - - - - - - - - - - - - - -4-2
Reset Module Message- - - - - - - - - - - - - - - - - - -4-2
Setting Up Communications Between the PLC and the
HI 1756-WS (-2WS) Weigh Scale Module - - - - - - - - - - - - - -4-2
Configuration Parameters for the HI 1765-WS Module- - - - - - - -4-4
Input Data - - - - - - - - - - - - - - - - - - - - - - - - -4-6
STATUSWORD - - - - - - - - - - - - - - - - - - - - - - - -4-6
Parameters for the HI 1756-WS (-2WS) Module - - - - - - - - - - -4-8
Commands- - - - - - - - - - - - - - - - - - - - - - - - - - - - -4-11
Zero Command (ZEROCMD) - - - - - - - - - - - - - - - - - -4-12
Tare Command (TARECMD) - - - - - - - - - - - - - - - - - -4-12
Write Non-Volatile Command (WRITENONVOLATILE) - - - - -4-12
Reload Non-Volatile (RELOADNONVOLATILE) - - - - - - - - -4-13
Enable Calibration Button Command (ENABLEBUTTONCMD)- -4-13
Disable Calibration Button Command (DISABLEBUTTONCMD) -4-13
Set Default Parameters (SETDEFAULTPARAMS)- - - - - - - -4-13

Table of Contents
iii
Cal Low Command (CALLOWCMD) - - - - - - - - - - - - - -4-13
Cal High Command (CALHIGHCMD) - - - - - - - - - - - - - -4-14
C2 Cal Command (C2CALCMD) - - - - - - - - - - - - - - - -4-14
Read Weight Cal Command (READWEIGHTCAL) - - - - - - -4-15
Perform Integrated Technician Tests (WEIGHSYSTEST) - - - -4-15
Structure (ITECHTEST)- - - - - - - - - - - - - - - - - - -4-15
Search for C2 Load Sensors (C2SEARCH) - - - - - - - - - - -4-16
Read C2 Sensor Serial Number (READC2SERIALNUM) - - - -4-17
Read Status of Module (GETSTATUS) - - - - - - - - - - - - -4-18
Write Parameters (WRITEPARAM) - - - - - - - - - - - - - - -4-18
Read Parameters (READPARAM) - - - - - - - - - - - - - - -4-18
Read Live Weight (READLIVEWEIGHT) - - - - - - - - - - - -4-19
Command Table - - - - - - - - - - - - - - - - - - - - - - - -4-19
Output Table - - - - - - - - - - - - - - - - - - - - - - - - - -4-20
Error Code List - - - - - - - - - - - - - - - - - - - - - - - - -4-21
Timed Out Commands - - - - - - - - - - - - - - - - - - - - -4-21
Return Codes - - - - - - - - - - - - - - - - - - - - - - - - -4-21
Calibration Setup Procedures - - - - - - - - - - - - - - - - - - - -4-21
Setting the Unit of Measure - - - - - - - - - - - - - - - - - - -4-21
Setting the Motion Tolerance Value - - - - - - - - - - - - - - -4-22
Setting the Zero Tolerance Value - - - - - - - - - - - - - - - -4-22
Setting the Auto Zero Tolerance Value - - - - - - - - - - - - -4-22
Setting the Number of Readings Averages - - - - - - - - - - -4-22
Setting the Span Weight Value - - - - - - - - - - - - - - - - -4-22
Setting the WAVERSAVER® Value - - - - - - - - - - - - - - -4-22
CHAPTER 5 - CALIBRATION - - - - - - - - - - - - - - - - - - -5-1
A Brief Description of Chapter 5- - - - - - - - - - - - - - - - - - -5-1
Pre-Calibration Procedures - - - - - - - - - - - - - - - - - - - - -5-1
Electrical Check Procedures - - - - - - - - - - - - - - - - - - - -5-2
Load Cell/Point Input/Output Measurements- - - - - - - - - - -5-2
Load Check - - - - - - - - - - - - - - - - - - - - - - - - - - - -5-3
C2 Calibration - - - - - - - - - - - - - - - - - - - - - - - - - - -5-4
About C2 Calibration - - - - - - - - - - - - - - - - - - - - - -5-4
“THE BUTTON” C2 Calibration - - - - - - - - - - - - - - - - -5-4
C2 Calibration Using Ladder Logic - - - - - - - - - - - - - - -5-6
Hard Calibration - - - - - - - - - - - - - - - - - - - - - - - - - -5-6
Hard Calibration Procedures - - - - - - - - - - - - - - - - - -5-6
Hard Calibration Ladder Logic Example - - - - - - - - - - - - -5-7
CHAPTER 6 - OPERATING PROCEDURES - - - - - - - - - - - -6-1
A Brief Description of Chapter 6- - - - - - - - - - - - - - - - - - -6-1
Input Data - - - - - - - - - - - - - - - - - - - - - - - - - - -6-1

HI 1756-WS WEIGH SCALE MODULE
iv
CHAPTER 7 - TROUBLESHOOTING- - - - - - - - - - - - - - - -7-1
A Brief Description of Chapter 7- - - - - - - - - - - - - - - - - - -7-1
Scale LED stays off when Performing a C2 Calibration with
The Button - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7-1
Scale LED is Flashing Red - - - - - - - - - - - - - - - - - - - - -7-1
Return Codes- - - - - - - - - - - - - - - - - - - - - - - - - -7-1
Mechanical Inspection - - - - - - - - - - - - - - - - - - - - - - -7-5
Load Sharing and Load Sensor Checkout - - - - - - - - - - - - - -7-6
Guidelines for Instabilities on Formerly Operating Systems - - - - -7-7
Electrical - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -7-8
Mechanical Stability and Configuration Settings - - - - - - - - - - -7-9
INDEX
GLOSSARY OF TERMS

Table of Illustrations
I
Table of Illustrations
CHAPTER 3 - INSTALLATION - - - - - - - - - - - - - - - - - - -3-1
POSITIONING THE MODULE FOR INSTALLATION - - - - - - - -3-2
MODULE RELEASE(S)- - - - - - - - - - - - - - - - - - - - - - -3-3
MODULE INSTALLED IN CHASSIS- - - - - - - - - - - - - - - - -3-3
HI 1756-WS WITH DOOR OPEN - - - - - - - - - - - - - - - - - -3-5
HI 1756-2WS WITH DOOR OPEN - - - - - - - - - - - - - - - - -3-5
INDUSTRY STANDARD LOAD CELLS WIRING DIAGRAM - - - - -3-6
HARDY LOAD SENSOR/C2 WIRING DIAGRAM - - - - - - - - - -3-6
REMOTE TERMINAL ASSEMBLY - - - - - - - - - - - - - - - - -3-7
RTA WITH JUMPERS FOR LOAD CELLS WITHOUT
SENSE LINES - - - - - - - - - - - - - - - - - - - - - - - - - - -3-7
RTA CABLE ASSEMBLY - HI 1756WS SINGLE CHANNEL - - - - -3-8
RTA CABLE SCHEMATIC - HI 1756WS SINGLE CHANNEL - - - -3-8
RTA CABLE ASSEMBLY - HI 17562WS DUAL CHANNEL - - - - -3-8
RTA CABLE SCHEMATIC - HI 1756-2WS DUAL CHANNEL- - - - -3-9
HARDY HI 215IT JUNCTION BOX WIRING DIAGRAM - - - - - - -3-9
CHAPTER 4 - SETUP - - - - - - - - - - - - - - - - - - - - - - -4-1
MODULE LEDS SINGLE CHANNEL - - - - - - - - - - - - - - - -4-1
MODULE LEDS DUAL CHANNEL‘ - - - - - - - - - - - - - - - - -4-1
COMMUNICATION CONFIGURATION DIALOG BOX- - - - - - - -4-3
DISCRETE DATA - - - - - - - - - - - - - - - - - - - - - - - - -4-7
PARAMETERS DIALOG BOX - - - - - - - - - - - - - - - - - - -4-10
PARAMETERS DIALOG BOX (CONT’D) - - - - - - - - - - - - - -4-10
MESSAGE CONFIGURATION EXAMPLE- - - - - - - - - - - - - -4-11
CHAPTER 5 - CALIBRATION - - - - - - - - - - - - - - - - - - -5-1
PROPERLY INSTALLED LOAD CELL W/NO BINDING - - - - - - -5-2
MILLIVOLTS/WEIGHT SCALE - - - - - - - - - - - - - - - - - - -5-3
“THE BUTTON” C2 CALIBRATION - HI 1756-WS - - - - - - - - - -5-5
“THE BUTTON” C2 CALIBRATION - HI 1756-2WS - - - - - - - - -5-5
CHAPTER 6 - OPERATING PROCEDURES - - - - - - - - - - - -6-1
COMMUNICATION CONFIGURATION DIALOG BOX- - - - - - - -6-1
DISCRETE DATA - - - - - - - - - - - - - - - - - - - - - - - - -6-2
CHAPTER 7 - TROUBLESHOOTING- - - - - - - - - - - - - - - -7-1
COMMAND RETURN PROCESS- - - - - - - - - - - - - - - - - -7-2
COMMAND DEFINITIONS AND ACTIONS - - - - - - - - - - - - -7-3
MECHANICAL INSPECTION - - - - - - - - - - - - - - - - - - - -7-5
LOAD SHARING AND LOAD SENSOR CHECKOUT - - - - - - - -7-6

HI 1756-WS WEIGH SCALE MODULE
II
GUIDELINES FOR INSTABILITIES ON FORMERLY
OPERATING SYSTEMS - - - - - - - - - - - - - - - - - - - - - -7-7
GUIDELINES FOR INSTABILITIES ON FORMERLY
OPERATING SYSTEMS - ELECTRICAL - - - - - - - - - - - - - -7-8
MECHANICAL STABILITY AND CONFIGURATION SETTINGS - - -7-9

Chapter 1 - Overview
1-1
CHAPTER 1 - OVERVIEW
A BRIEF
DESCRIPTION OF
CHAPTER 1
This manual is designed for use by installers, opera-
tors, and service personnel. It provides specifications
and procedures for linking, configuring, operating,
maintaining, and troubleshooting the Hardy Instru-
ments HI 1756-WS and HI 1756-2WS ControlLogix®
I/O Weigh Scale Modules.
NOTE: Control/Logix®is a registered trademark of the Rock-
well Corporation.
Both modules come with WAVERSAVER®, C2®but-
ton-triggered calibration, INTEGRATED TECHNICIAN
(IT®) diagnostics, and ladder logic configurability.
NOTE: WAVERSAVER®, C2®, INTEGRATED TECHNICIAN®are
registered trademarks of Hardy Instruments Inc.
Before using the product, be sure you understand all
cautions, warnings, and safety procedures stated or
referenced in this manual. And, to get the best service
from this product, follow the practices recommended
in this manual.
Hardy Instruments appreciates your business. We
welcome all corrections or suggestions for improve-
ment of this manual. Should you not understand any
information in this manual or experience any prob-
lems with the product, please contact our Customer
Support Department at:
Phone: [phone]
FAX: [phone]
e-mail: [e-mail]
Web: hardyinst.com
About This Manual Chapter 1 - Introduces the instruments and provides
an overview of the their capabilities
Chapter 2 - Provides a list of specifications
Chapter 3 - Contains instructions needed to install
the HI 1756-WS and HI 1756-2WS (both standard
and optional equipment) and the Remote Termination
Assembly (-RTA)

HI 1756-WS WEIGH SCALE MODULE
1-2
Chapter 4 - Provides hardware configuration instruc-
tions, including dip switch and jumper settings.
Chapter 5 - Provides firmware/software setup proce-
dures needed to operate and calibrate the instrument.
Chapter 6 - Provides calibration instructions.
Chapter 7 - Provides operating procedures.
Chapter 8 - Provides troubleshooting procedures.
Description Both the HI 1756-WS and HI 1756-2WS Weigh Scale
Modules are self-contained, microprocessor-based
ControlLogix I/O modules with control inputs and
outputs that plug into the backplane of an Allen-Brad-
ley ControLogix®programmable controller and/or
Remote Rack. The remote rack module connects to
the local chassis via a ControlNet link.
NOTE: The Allen-Bradley Control/Logix®manuals contain
useful information about their products that is not
provided in this manual. This manual assumes that
users have a basic understanding of process control
and can interpret ladder logic instructions as needed
to generate the electronic signals that control their
application(s).
The HI 1756-WS Weigh Scale Module Series A is
configured for single-channel operation while the HI
1756-2WS Weigh Scale Module Series A is config-
ured for dual-channel operation. Both modules can be
used for a wide variety of process weighing applica-
tions such as batching, blending, filling/dispensing,
check weighing, force measurement, level by weight
and weight rate monitoring.
The analog-to-digital converter in the weigh module
controller updates fifty times per second and is capa-
ble of 8,388,608 counts of display resolution. This is
enough to provide accurate weight measurement and
control and to tolerate large “dead” loads or over siz-
ing of load cells/sensors. To calibrate the module you
can simply push “The Button” to effect a C2 elec-
tronic calibration. C2, Hard (Traditional calibration
with weights) is also available for those not using
Hardy Instruments C2 certified load sensors.

Chapter 1 - Overview
1-3
WAVERSAVER®During the measurement of small weight changes, the
affects of mechanical vibration and noise from the
operating environment can introduce substantial inter-
ference. WAVERSAVER factors out vibration, noise,
and other interference-related signals from the load
cell so the rate controller can better decipher the
actual weight data.
WAVERSAVER®can be configured to ignore noise
with frequencies as low as 0.25 Hz. One of five higher
additional cut off frequencies may be selected to pro-
vide a faster instrument response time. The default
factory configuration is 1.00 Hz vibration frequency
immunity.
C2®Calibration Traditional calibration uses certified test weights.
C2® Electronic Calibration allows a scale to be cali-
brated without the need for test weights. It can be ini-
tiated by pressing “THE BUTTON®” located in the
front of the module, or via ladder logic.
A C2 weighing system consists of up to eight C2 load
sensors, a junction box, interconnect cable, and an
instrument with C2 capabilities (e.g., the HI 1756).
Each Hardy Instruments C2-certified load sensor out-
puts digital information used for the calibration. The
modules reads the sensor outputs and detects the num-
ber of active sensors. It then calibrates the scale based
on the load sensor’s output plus a user-supplied refer-
ence point value (from 0 to any known weight on the
scale).
IT® INTEGRATED TECHNICIAN™is a system diagnostics
utility which, in conjunction with an HI 215IT series
IT junction box, continuously monitors the excitation
circuit (with up to 4 load sensors) for possible mal-
functions. IT reads individual load sensor voltages
and weights and isolates individual system compo-
nents for quick and easy troubleshooting.
Excitation Monitor Continuously monitors a system’s excitation current
to check for open or shorted load sensors or damaged
or broken excitation wire(s), including the wires

HI 1756-WS WEIGH SCALE MODULE
1-4
between the module, Remote Terminal Assembly
(RTA) and the IT®Junction box. If the measured cur-
rent deviates more than a ± 10% tolerance, an “Exci-
tation Error” bit (Module Status Word bit 9) is set to
1.
Digital Volt Meter
(DVM) - Optional Requires the HI 215IT Series Junction Box to monitor both mV and mV/V readings for the system and per
individual load sensor. Once a problem is detected by
the operator the DVM readings help the operator to
isolate the faulty component. Further, the DVM read-
ings can be used to level a system and to make corner
adjustments to platform scales. Accuracy is +/- 2% or
better of full scale.
NOTE: If you do not have the HI 215IT Junction Box con-
nected to the module, the mV/V reading as displayed
is the total for all the load cells on the system.
Return to Zero
Test - Optional Requires the HI 215IT Series Junction Box to monitor individual load sensors. This test compares the origi-
nal voltage reading (saved at calibration) against the
current voltage reading of an empty vessel. The test
checks for damaged load sensorsdue to electrical zero
shift or abnormal mechanical forces that cause bind-
ing on one or all of the load sensors in the system.
Weighing System
Tests - Optional Requires the HI 215IT Series Junction Box for full utilization. This test is used to diagnose drifting or
unstable weight reading problems. The Weighing Sys-
tem Test does the following:
1. Disconnects the controller and engages an inter-
nal reference signal to see if the problem is within
the instrument.
2. Disconnects the load sensors and engages an
internal (in the junction box) reference signal to
see if the cable between the instrument and the
Junction Box is causing the problem.
3. Reads the weight of each load sensor to see if the
load sensor might be causing the problem.

Chapter 1 - Overview
1-5
The ability to read the weight seen by each individual
load sensor allows use of this test to make cornering,
leveling and load sharing adjustments to the weighing
system.
AUTO ZERO
TRACKING Auto Zero Tracking automatically adjusts for zero
weight. This capability allows the module to ignore
material build-up in the weighing system within a pre-
set auto zero tolerance. For auto zeroing to work cor-
rectly, any “live weight” plus any weight previously
zeroed on the scale must be below the set Auto Zero
Tolerance value and the scale must not be in motion.
This is not used on all applications and should be
reviewed before use.
NOTE: The amount of weight zeroed off is cumulative. The
Autozero command will fail if the current gross weight
plus any previously zeroed amount exceeds the zero
tolerance value.

HI 1756-WS WEIGH SCALE MODULE
1-6

Chapter 2 - Specifications
2-1
CHAPTER 2 - SPECIFICATIONS
A Brief Description of
Chapter 2 Chapter 2 lists the specifications for the HI 1756-WS
and HI 1756-2WS Weigh Scale Modules. Specifica-
tions are listed for the standard instrument and for
optional equipment. The specifications listed are
designed to assist in the installation, operation and
troubleshooting of the instrument. All service person-
nel should be familiar with this section before
attempting an installation or repair of this instrument.
Specifications for a
Standard HI 1756-WS
(-2WS) Weigh Scale
Module
Channels 2 Channels
• Single Channel HI 1756-WS
• Dual Channel HI 1756-2WS
Conversion Rate 50 updates per second
Averages 1-255 User Selectable in single increments
Resolution Internal: 1:8,388,608
Input Up to eight (8) 350 ohm Full Wheatstone Bridge,
Strain Gauge Load Sensors/Cells (5 volt excitation)
on one vessel.
Non-Linearity 0.0015% of Full Scale
WAVERSAVER®User Selectable
• 7.50 Hz
• 3.50 Hz
• 1.00 Hz (Default)
• 0.50 Hz
• 0.25 Hz
Excitation Monitor Current less than +/- 10% expected
Common-Mode
Rejection 110dB at or below 60 Hz

HI 1756-WS WEIGH SCALE MODULE
2-2
Common-Mode
Voltage Range 2.5VDC maximum (with respect to earth ground)
Backplane Input
Voltage 5 VDC and 24 VDC
Backplane Current
Load <1 Amp at 5 VDC
0.0125 Amps at 24 VDC (with 4-350 Ohm Load Cells
Backplane Power
Load < 5W at 5 VDC
< .3W at 24 VDC with 4-350 Ohm Load Cells
C2 Calibration
Input Isolation from digital section 1000 VDC minimum.
Cable lengths 1000 feet maximum of C2 authorized cable
250 feet maximum of C2 authorized cable (Maximum
of 4 load sensors) with IT Junction box.
Load Cell
Excitation 5 VDC +/- 1.15 W maximum.
Isolation from digital section 1000 VDC minimum
C2 Calibration
Output Isolation from digital section 1000 VDC minimum
Environmental
Requirements
Temperature
Coefficient Less than 0.005% of full scale per degree C for Cal- LO and Cal-HI reference points
Operating
Temperature
Range
0oC to 60oC (32oF to 140oF)
Storage
Temperature
Range
-40oC to 85oC (-40oF to 185oF)
Humidity Range 0-90% (non-condensing)
Approvals CE Approval
UL, CUL (pending)
Digital Voltmeter Accuracy +/- 2% of full scale
Resolution

Chapter 2 - Specifications
2-3
• mV/V 4 digits to the right of the decimal
Optional Equipment
1756 RTA (Remote
Termination
Assembly
Hardy Part # -RTA (HI-1756-XX-RTA if ordered sep-
arately) Remote Termination supports two (2) sepa-
rate HI 1756-WS weigh scale modules or one (1) HI
1756-2WS weigh scale module. Unit includes DIN
rail mounting for 35mm x 15mm DIN rail.
RTA Cable
Assemblies Hardy Part # -C6 (HI 1756-XX-C6)
• Cable Length: 6 ft. (1.525 meters) from
the single channel module to the RTA.
Hardy Part # -C6 (HI 1756-XX-DC6)
• Cable Length: 6 ft. (1.525 meters) from
the dual channel module to the RTA.
HI 215IT Series
Junction Box NEMA rated waterproof enclosure which sums from one to four load sensors load sensors.
• -PS1 NEMA 4 Painted Steel
• -SS1 NEMA 4X Stainless Steel
• -FG1 NEMA 4X Fiberglass
Default Parameters
Parameter Default Setting
ChanActive 1On
calyear*
calmonth*
calday*
calid[2]*
Calib Type
tareweight 0.0 lbs
Table 2-1: Default Parameters

HI 1756-WS WEIGH SCALE MODULE
2-4
NOTE: * The HI 1756 modules do not have a real time clock,
so the year; month; day and calid must be set by the
operator.
Metric lbs 0
WAVERSAVER®1 Hz 3
SpanWeight 10,000.00
CalLowWeight lbs 0
Num Averages 10
ZeroTrackEnable False 0
ROCTimeBase 10
ZeroTolerance 10
AutoZeroTolerance 10.0 lbs
MotionTolerance 5.0 lbs
Parameter Default Setting
Table 2-1: Default Parameters

Chapter 3 - Installation
3-1
CHAPTER 3 - INSTALLATION
A Brief Description of
Chapter 3 Chapter 3 provides the recommended procedures for
unpacking, cabling, interconnecting, configuring and
installing the Weigh Scale Module. Users and service
personnel should be familiar with this information
before installing or operating the Weigh Scale mod-
ule. If you experience any problems installing this
equipment, contact Hardy Instruments Inc., Customer
Support for assistance.
Unpacking Step 1. Before signing the packing slip, inspect
the packing for damage of any kind, and
report any damage to the carrier company
immediately.
Step 2. Check to see that everything in the pack-
age matches the bill of lading. You should
normally have:
• HI 1756-WS or HI 1756-2WS Weigh
Scale Module
• Operation and Installation Manual
Step 3. Write down the Model and Serial number
of the module. You may need this informa-
tion when contacting The Customer Sup-
port Department for parts or service.
Installing the
HI 1756-WS (-2WS)
into an Allen-Bradley
ControlLogix
Processor or Allen-
Bradley Remote Rack
WARNING ELECTROSTATIC DISCHARGE MAY DAM-
AGE SEMICONDUCTOR COMPONENTS IN
THE MODULE. DO NOT TOUCH THE CON-
NECTOR PINS.
Observe the following handling precautions:
• Wear an approved wrist-strap ground-
ing device when handling the module.

HI 1756-WS WEIGH SCALE MODULE
3-2
• Touch a grounded object or surface to
rid yourself of any electrostatic dis-
charged prior to handling the module.
• Handle the module from the bezel in
front away from the connector. Never
touch the connector pins.
• Do not install the module right next to
an AC or high voltage DC module.
• Route all the load voltage cables
away from high voltage cables.
Installing the
HI 1756-
WS (-
2WS)
into the
ControlL
ogix
Chassis
Step 1. Make sure that the module is oriented cor-
rectly for installation. (See Fig. 3-1)
FIG. 3-1 POSITIONING THE MODULE FOR
INSTALLATION
Step 2. Gently slide the module into the Chassis.
Step 3. Slide the digital board between the PCB
Guides on the top plate and bottom plate
of the chassis to line up the module con-
nector with the backplane connector.
Step 4. When the module connector is touching
the backplane connector, firmly but care-
fully push toward the chassis until the pins
are plugged in and the Processor Releases
(both top and bottom) are snapped into
place. (See Fig. 3-2 & 3-3)