Hardy HI 1756-2WS User Manual

HI 1756-WS & HI 1756 -2WS

WEIGH SCALE MODULE

Series A

OPERATION AND INSTALLATION

MANUAL

Corporate Headquarters

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 H ard y Inst rum ents, Inc. All Rights Reserved. Printed i n the U .S.A. (941028)

Local Field Service

Hardy has over 200 field technicians in the U.S., and more positioned throughout the
world to assist you in your support needs. We also have factory engineers who will
travel to your facility anywhere in the world to help you solve challenging applica
tions. We're ready to support you with:

• Installation and start-up

• Routine maintenance and certification

• Plant audits and performance measurement

• Emergency troubleshooting and repair

To request Emergency Service and Troubleshooting, Start-up, Installation, Calibra­tion, Verification or to discuss a Maintenance Agreement please call 800-821-5831
Ext. 1757 or Emergency Service after hours (Standard Hours 6:00 AM to 6:00 PM

Pacific Standard Time) and weekends

Ext. 1111.

-

Outside the U.S

Hardy Instruments has built a network of support throughout the globe. For specific
field service options available in your area please contact your local sales agent or our
U.S. factory at [phone], Ext. 1757.

Table of Contents

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

i

HI 1756-WS WEIGH SCALE MODULE

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

ii

Table of Contents

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 Logi c - - - - - - - - - - - - - - -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

iii

HI 1756-WS WEIGH SCALE MODULE

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

iv

Table of Illustrations

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

I

HI 1756-WS WEIGH SCALE MODULE

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

II

CHAPTER 1 - OVERVIEW

Chapter 1 - Overview

A BRIEF

DESCRIPTION OF

CHAPTER 1

NOTE: Control/Logix® is a register ed trademar k of the Rock-

NOTE: WAVERSAVER®, C2®, INTEGRATED TECHNICIAN® are

This manual is designed for use by installers, opera­tors, and service personnel. It provides specificat i ons
and procedures for linking, configuring, operating,
maintaining, and troubleshooting the Hardy Instru

ments HI 1756-WS and HI 175 6-2WS Control Logix®
I/O Weigh Scale Modules.

well Corporation.

Both modules come with WAVERSAVER®, C2® but­ton-triggered calibration, INTEGRATED TECHNICIAN

®

) diagnostics, and ladder logic configurability.

(IT

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] m
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)

1-1

HI 1756-WS WEIGH SCALE MODULE

Chapter 4 - Provides hardware configuration instruc­tions, including dip switch and jumper settings.

Chapter 5 - Provides firmware/software setup proce­dures 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 1756-2 WS 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).

-

1-2

The HI 1756-WS Weigh Scale Module Series A is
configured for single-channel operati on whil e 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

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 fi ve 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 out puts and d etects t he num
ber of active sensors. It then calibrates the sca le 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 troubleshoot ing.

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

-

-

1-3

HI 1756-WS WEIGH SCALE MODULE

between the module, Remote Terminal Assembly
(RTA) and the IT

rent deviates more than a ± 10% tolerance, an “Exci­tation Error” bit (Module Status Word bit 9) is set to

1.

®

Junction box. If the measured cur-

Digital Volt Meter

(DVM) - Optional

Requires the HI 215IT Series Ju nction 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 Ju nction Box to monit or
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 sensors due 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:

-

-

-

-

1-4

1. Disconnects the controller and engages an inter­nal 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 s ee if the
load sensor might be causing the problem.

Chapter 1 - Overview

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

NOTE: The amount of weight zeroed off is cumulative. The

Auto Zero Tracking automatically adjusts for zero
weight. This capability allows the module to ignore
material build-up in the weighing system within a pre­set 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.

Autozero command will fail if the current gross weight
plus any previously zeroed amount exceeds the zero
tolerance value.

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1-5

HI 1756-WS WEIGH SCALE MODULE

1-6

CHAPTER 2 - SPECIFICATIONS

Chapter 2 - Specifications

A Brief Description of Chapter 2

Specifications for a Standard HI 1756-WS (-2WS) Weigh Scale Module

Channels 2 Channels

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,

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.

• Single Channel HI 1756-WS

• Dual Channel HI 1756-2WS

Strain Gauge Load Sensors/Cells (5 volt excitation)
on one vessel.

-

-

Non-Linearity 0.0015% of Full Scale

WAVERSAVER

Excitation Monitor Current less than +/- 10% expected Common-Mode

Rejection

®

User Selectable

• 7.50 Hz

• 3.50 Hz

• 1.00 Hz (Default)

• 0.50 Hz

• 0.25 Hz

110dB at or below 60 Hz

2-1

HI 1756-WS WEIGH SCALE MODULE

Common-Mode Voltage Range

Backplane Input Voltage

Backplane Current Load

Backplane Power Load

C2 Calibration Input

Cable lengths 1000 feet maximum of C2 authorized cable

Load Cell Excitation

C2 Calibration Output

Environmental Requirements

2.5VDC maximum (with respect to earth ground)

5 VDC and 24 VDC

<1 Amp at 5 VDC

0.0125 Amps at 24 VDC (with 4-35 0 Ohm Load Cel ls

< 5W at 5 VDC
< .3W at 24 VDC with 4-350 Ohm Load Cells

Isolation from digital section 1000 VDC minimum.

250 feet maximum of C2 authorized cable (Maximum
of 4 load sensors) with IT Junction box.

5 VDC +/- 1.15 W maximum.
Isolation from digital section 1000 VDC minimum

Isolation from digital section 1000 VDC minimum

Temperature Coefficient

Operating Temperature Range

Storage Temperature Range

Humidity Range 0-90% (non-condensing) Approvals CE Approval

Digital Voltmeter Accuracy +/- 2% of full scale

2-2

Less than 0.005% of full scale per degree C for Cal­LO and Cal-HI reference points

0o C to 60o C (32o F to 140o F)

-40o C to 85o C (-40o F to 185o F)

UL, CUL (pending)

Resolution

Optional Equipment

Chapter 2 - Specifications

• mV/V 4 digits to the right of the decimal

1756 RTA (Remote Termination Assembly

RTA Cable Assemblies

HI 215IT Series Junction Box

Default Parameters

Hardy Part # -RTA (HI-1756-XX-RTA if ordered sep­arately) Remote Termination supports two (2) sepa­rate 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.

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.

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

Parameter Default Setting

ChanActive 1 On

calyear*

calmonth*

calday*

calid[2]*

Calib Type

tareweight 0.0 lbs

Table 2-1: Default Parameters

2-3

HI 1756-WS WEIGH SCALE MODULE

Parameter Default Setting

Metric lbs 0

WAVERSAV ER

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

®

1 Hz 3

Table 2-1: Default Parameters

NOTE: * The HI 1756 modules do not have a rea l time clock,

so the year; month; day and calid must be set by the
operator.

2-4

CHAPTER 3 - INSTALLATION

Chapter 3 - Installation

A Brief Description of Chapter 3

Unpacking Step 1. Before signing the packing slip, inspect

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 In str uments In c., Custo mer
Support for assistance.

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 ladi ng. 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 infor ma
tion when contacting The Customer Sup­port Department for part s or service.

-

-

Installing the
HI 1756-WS (-2WS)
into an Allen-Bradley
ControlLogix
Processor or Allen­Bradley 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 t he module.

-

3-1

HI 1756-WS WEIGH SCALE MODULE

• T ouch a grounded ob ject 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 co nnector 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 1756­WS (­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)

-

-

3-2

Chapter 3 - Installation

Step 5. The installation is complete.

FIG. 3-2 MODUL E RELEASE(S )

Removing the Module from the Chassis

FIG. 3-3 MO DULE INSTALLED IN CHASSIS

Step 1. Press down on the top and bottom proces-

sor releases simultaneously and pull the
module out of the chassis. (See Fig. 3-3)

Step 2. Store the module in a safe, secure location

in an anti-static bag or its original package.

3-3

HI 1756-WS WEIGH SCALE MODULE

Installing the Module I/ O Connector

About the Module I/O Connector

The I/O Connector at the front of the module connects
the module to the Remote Terminal Assembly (­RTA), a load sensor, or the HI 215IT Series Junction
Box, depending on how many load sensors are
installed in the weighing system. See below for the
pin-out diagram, which is also located on the inside of
the module door. (See Fig. 3-4 & 3-5)

Single Channel Dual Channel

Pin 1 Exc+
Pin 2 Sense+
Pin 3 Sig+
Pin 4 Sig­Pin 5 Sense­Pin 6 Exc­Pin 7 C2+
Pin 8 C2­Pin 9 Shield

Pin 1 Exc+
Pin 2 Sense+
Pin 3 Sig+
Pin 4 Sig­Pin 5 Sense­Pin 6 Exc­Pin 7 C2+
Pin 8 C2­Pin 9 Shield
Pin 10 Exc+
Pin 11 Sense+
Pin 12 Sig+
Pin 13 Sig­Pin 14 Sense­Pin 15 Exc­Pin 16 C2+
Pin 17 C2­Pin 18 Shield

Step 1. Open the Module door to gain access to

the I/O connector. (See Fig. 3-4 & 3-5)

Step 2. Install the cable and connector so it allows

the module door to be shut.

Step 3. With the plug oriented correctly (See the

pin-out diagram above), plug the I/O male
connector into the I/O connector at the
front of the module.

Step 4. Verify that the connector is completely

plugged in before opera ting the module.

NOTE: Most problems are due to loose connections. Be sure

to check the I/O connection first if you have a problem

3-4

Chapter 3 - Installation

receiving information from the load cells or if the
relays do not operate correctly.

FIG. 3-4 HI 1756-WS WITH DOOR OPEN

FIG. 3-5 HI 1756-2WS WITH DOOR OPEN

3-5

HI 1756-WS WEIGH SCALE MODULE

Load Cell Wiring Diagrams

Industry Standard Load Cells

FIG. 3-6 INDUSTRY STANDARD LOAD CELLS

WIRING DIAGRAM

Hardy Load Sensor with C2

3-6

FIG. 3-7 HARDY LOAD SENSOR/C2 WIRING

DIAGRAM

Chapter 3 - Installation

HI 1756 Remote Terminal Assembly (HI 1756-XX-RT)

NOTE: When using load cells that do not have sense lines you

The RTA provides connection points between the HI
module’s cable assembly and the wires from the junc
tion box(es) or load sensor(s). It comes with a stan­dard 35 mm Din Rail Mounting and requires at least a

5” inch DIN rail for mounting.

FIG. 3-8 REMOTE TERMINAL ASSEMBLY

will need to jumper the Sense (-) to the Excitation (-)
and the Sense (+) to the Excitation (+) for one or both
channels. (See Fig. 3-9)

-

Jumpers

FIG. 3-9 RTA WITH JUMPERS FOR LOAD

CELLS WITHOUT SENSE LINES

3-7

HI 1756-WS WEIGH SCALE MODULE

RTA Cable Assembly

• Six (6) foot cable that connects to the HI 1756­WS module.

FIG. 3-10 RT A CABLE ASSEMBLY - HI 1756WS

SINGLE CHANNEL

FIG. 3-11 RTA CA BLE SCHEMATIC - HI

1756WS SINGLE CHANNEL

3-8

• Six (6) foot cable that connects to the HI 1756­2WS module

FIG. 3-12 RTA CAB LE ASSEMBLY - HI

17562WS DUAL CHANNEL

Hardy HI 215IT

Load
Cell
Connector

J1

Junction Box

Chapter 3 - Installation

FIG. 3-13 RTA CABLE SCHEMATIC - HI 1756-

2WS DUAL CHANNEL

FIG. 3-14 HARDY HI 215IT JUNCTION BOX WIRING DIAGRAM

NOTE: When connecting the Hardy HI 215IT Junction Box

you must remove the two factory installed jumpers
1&2 and 5&6 on the module install sense lines.

3-9