Hardy HI 1756-2WS User Manual

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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: (858) 278-2900 FAX: (858) 278-6700 Web-Site: http://www.hardyinst.com

Hardy Instruments Document Number: 0596-0247-01 Rev K

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 +1 858-292-2710, Ext. 1757.

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

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

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

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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

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

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

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: (858) 278-2900 FAX: (858) 278-6700 e-mail: support@hardyinst.co 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)

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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).

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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).

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

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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

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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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

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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

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

HI 1756-WS WEIGH SCALE MODULE

3-10

CHAPTER 4 - SETUP

Chapter 4 - Setup

A Brief Description of Chapter 4

Power Check Step 1. To make or change settings, there must be

Chapter 4 covers the firmware and software settings used to prepare the module controller for calibration and operation. The Setup procedures require AllenBradley’s RS Logix 5000, Allen-Bradley RSLinx™ or RSLinx™ Lite.

power to both the PLC and the module. Veri fy th at the LED’s are lit for normal operation. (See Figs. 4-1 and 4-2)

FIG. 4-1 MODULE LEDS SINGLE CHANNEL

FIG. 4-2 MODULE LEDS DUAL CHAN NEL ‘

4-1

HI 1756-WS WEIGH SCALE MODULE

LEDS

Scale Data LEDs

OK Module Status LED

Reset Module Message

Flashing Green Error No Calibration Steady Green Running (Normal) Steady Red Error Read Failure or Error eeprom

write. Contact HI Customer Sup-

port Flashing Red Read Convert Error. LED is Off Channel is Inactive

Brief Steady During power up the LED lights

Red for about one second. Flashing Green In Program mode. (Normal)

Steady Green In Run Mode. (Normal) Steady Red Config. Fault The eeprom (Backplane checksum failed - bad serial eeprom A vailable) data or blank serial eeprom. Contact

HI Customer Support. Steady Red Internal Hardware watchdog timer

fault (e.g. bad Hardware or Firm-

ware). ASIC is non-operational. Flashing Red Communication Error.

Modules with communication errors (indicated by a flashing red Module Status LED) can be reset by a reset message.

Setting Up Communications Between the PLC and the HI 1756- WS (-2W S) Weigh Scale Module

4-2

• Message Type: CIP Generic

• Service Code 5 (Hex)

• Class Name: 1

• Instance Name: 1

Follow these steps to set up communication between the ControlLogix PLC and the Weigh Scale Module. The steps require that you have a new or open RS

Logix

5000 project. For instructions, see your RS

LOGIX 5000 manual.

Step 1. Look for a list of folders on the left side of

the screen. Scroll to and select the I/O Config folder, which will open a menu.

Chapter 4 - Setup

Step 2. Select New Module to display a list of

modules.

Step 3. Scroll to and select the Generic 1756 mod-

ule to open the Module Properties form.

Step 4. Enter the following connection parameters

in the appropriate fields:

• Name of Module

• Description of Module (Optional)

•Slot ID

• Input Assembly Instance:101 Size = 11

• Output Assembly Instance: 146 Size = 1

• Configuration Asse mbly Instance:241

NOTE: Size = 0 configuration table not used)

or (with version 2.3 software): Size = 64 (8-bit) for a 1-channel unit Size = 128 (8-bit) for a 2-channel unit

Step 5. Select DATA REAL from the Comm For-

mat pull-down list.

FIG. 4-3 COMMUNICATION

CONFIGURATION DIALOG BOX

Step 6. Open the Connection Tab. Step 7. Set the RPI to 20 milliseconds or greater.

Do not set this parameter lower than 20 milliseconds.

Step 8. Click on Finish.

4-3

HI 1756-WS WEIGH SCALE MODULE

Configuration Parameters for the HI 1765-WS Module

With version 2.3 software, the HI 1765-WS module can recieve 32 words of the configuration data from a PLC upon power-up. These data are used only if the value for Config_rev_num is set to 1 and the parame ters are sent in the correct format and range.

NOTE: DINT Parameters can be interpreted as floating point

based on the value of a bit within the DecimalPoints parameter of the channel.

Parameter

Offset (In

Words)

Single Channel

Config_rev_num0 * ChanEnabled0 DecimalPoints0 ** Metric0 NumAverages0 Waversaver0

4-4

SpanWeight0 CalLowWeight0 ZeroTrackEnables0 AutoZeroTolerance0 MotionTolerance0 TareWeight0 EnableButton0 RocTimeBased0 ZeroTolerance0 Spare1_0

Chapter 4 - Setup

Parameter

Dual Channel

Config_rev_num1 *

ChanEnabled1

DecimalPoints1 ** Metric1 NumAverages1 Waversaver1 SpanWeight1 CalLowWeight1 ZeroTrackEnables1 AutoZeroTolerance1 MotionTolerance0 TareWeight0

Offset (In

Words)

EnableButton0 RocTimeBased0 ZeroTolerance0 Spare1_0

* Must be set to 1 for the other values to apply ** Converts integers to floating-point

When the parameters are displayed, they do not appear in the form above. They may look more like this:

Local:1:C.Data[0] Local:1:C.Data[1] ...and so on

4-5

HI 1756-WS WEIGH SCALE MODULE

Input Data This is discrete input data which is a module-defined

data type, LOCAL:X:I (where X is the slot number).

NOTE: The TimeStamp is a 64-bit integer giving the system

time in microseconds.

STATUSWORD The module returns a binary statusword where each

bit indicates a state or condition within the module. To interpret these states, note which bits are ON and use the chart below to match each bit location to the state it represents.

For Example: If the satausword is 69 with a binary value of 0000 0000 0100 0101, bits 0, 2 an 6 are on. Bit 0 indicates an A/D conversion error, bit 2 indi cates the unit is calibrated in lbs. and bit 6 indicates the scale is in motion.

NOTE: The screen in Fig. 4-4 shows input data in floating-

point format. To read the data bits, the Word0 status word must be copied to a double integer tag. The first, least significant 16 bits apply to channel 0. In a twochannel module, the 16 most significant bits apply to channel 1; otherwise the upper 16 bits are not used.

4-6

Chapter 4 - Setup

FIG. 4-4 DISCRETE DATA

STATUSWORD bit positions refer to these variables :

Word Number Definition

ERRORADCONVERT 0x0001 Millivolt return from the load cell

ERRORADFAILURE 0x0002 A/D converter in the unit is no

STATUSENGLISH 0x0004 Unit calibrated in lbs. If the bit is

STATUSZTRACK 0x0008 Auto Zer o Trac k ing is turned on .

STATUSBUTTONENABLED

STATUSINMOTION 0x0040 Weight is changing on the scale.

ERRORNOCAL 0x0080 The unit is at factory defa ul t se t-

ERROREEPROMWRITE 0x0100 EEPROM Hardware Error

ERROREXCITEMON 0x0200 Excitati o n monitor error.

ERRORMAX144 0x0400 Hardwar e E rror i n Excitation

STATUSCMDRCVD 0x2000 Output Table Command Complete

0x0010 Enabled/Disable d ca librate button.

system is out of range for the unit.

longer responding.

off, calibrated in kgs.

tings.

Monitor

4-7

HI 1756-WS WEIGH SCALE MODULE

Word Number Definition

STATUSCMDERROR 0x4000 Output Table Command Failed

STATUSCHANENABLED 0x8000 Set if chann el is enabled

Parameters for the HI 1756-WS (-2WS) Module

NOTE: The Glossary at the end of this manual provides addi-

tional information about the parameters and other common wei gh process definitions.

All parameters in Table 4-1 are either type DINT (4byte integer) or REAL (4-byte floating point).

# Type Parameter Description

1 DINT ChanActive Flag, determines if a channel is alive.

2 DINT calyear Year of last Cal ibration*

3 DINT calmonth Month of last Calibration*

4 DINT calday Day of last Calibration*

5 DINT[2]calid[2] ID of calibrator using init ia ls. e.g. JB*

6 DINT CalibType Read Only

7 REAL tareweight Tare weight in lbs or kgs as determined

8 DINT Metric Report weight in lbs or kgs.

Legal values are: 0 (Channe l Off) or 1 (Channel On)

Button = 3 C2 = 1 Hard Cal = 0 Never Calibrated = FFFF

by Metric.

Legal Values lbs = 0 kgs = 1

TABLE 4-1: PARAMETERS

4-8

# Type Parameter Description

Chapter 4 - Setup

9 DINT Waversaver Legal Values are 0-4

10 REAL SpanWeight Calibration weight, high, in lbs or kgs

11 REAL CalLowWeight Calibration weight, low, in lbs or kgs

12 DINT NumAverages Legal Values: 1-255

13 DINT ZeroTrackEnable Enable for Zero Tracking

14 DINT ROCTimeBase Legal Values: 1-1800 seconds

15 REAL ZeroTolerance In lbs or kgs.

16 REAL AutoZeroTolerance In lbs or kgs

17 REAL MotionTolerance In lbs or kgs

0 = 7.5 Hz 1 = 3.5 Hz 2 = 1 Hz 3 = .5 Hz 4 = 0.25 Hz

Legal Values: 0 = Not Enabled 1 = Enabled

TABLE 4-1: PARAMETERS

NOTE: *Since the 1756 module has no real-time clock, the

operator must set the ye ar, month, day, and calid.

4-9

HI 1756-WS WEIGH SCALE MODULE

FIG. 4-5 PARAMETERS DIALOG B OX

4-10

FIG. 4-6 PARAMETERS DIALOG BOX (CONT’D)

Chapter 4 - Setup

Commands Commands are configured in the RSLOGIX 5000 as

follows:

• Message Type: CIP Generic

• Service Code 4c (Hex)

• Class Name: 4

• Instance Name: 254

• Object Attribute: None, leave this field b lank

• Message source: a tag defining the data sent to the HI 1756-WS (-2WS).

• Number of elements: defined by the command used.

• Message destination: a tag where the reply data will be written.

FIG. 4-7 MESSAGE CONFIGURAT ION

EXAMPLE

All commands begin with the following fields:

• Command (DINT): The command number

• Channel (DINT): The channel number (mus t

be 0)

NOTE: Some commands require additional fields, as speci-

fied in the command.

4-11

HI 1756-WS WEIGH SCALE MODULE

Reply data contains 3 fields

• Command (DINT): The command number

• Channel (DINT): The channel number

• Status (DINT): Status information

NOTE: Some commands will produce longer replies.

Zero Command (ZEROCMD)

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

Tare Command (TARECMD)

The Zero Command requests that the current gross weight be set to zero.

Command Number: 1 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8 Error Return Values:

• OUTOFTOLERANCE - the current weight value is beyond the limits set by the zero toler ance parameter.

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

• “STATUSWORD” - the command failed because either the weight was not stable (in motion) or there was some kind of A/D error.

The T are Command requ ests the current n et weight be set to zero.

Command Number: 2 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

4-12

Error Return Values:

• “STATUSWORD” - the command failed because either the weight was not stable (in motion) or there was some kind of A/D error.

Chapter 4 - Setup

Write Non-Volatile

Command (WRITENONVOL ATILE)

Reload NonVolatile (RELOADNONVOL ATILE)

Enable Calibration Button Command (ENABLEBUTTON CMD)

The Write Non-Volatile Command causes all parameters (including calibration constants) to be saved to the non-volatile memory.

Command Number: 4 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Error Return Values: None The Reload Non-Volatile Command causes the weigh

module to re-read the values stored in its non-volatile memory . Any parameters changed since the last write non-volatile command are overwritten. this command can be used to abort a calibration or parameter entry session.

Command Number: 0x10 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Error Return Values: None The Enable Calibration Button Command activates

the calibration button.

Command Number: 20 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Disable Calibration Button Command (DISABLEBUTTON CMD)

Set Default Parameters (SETDEFAULTPAR AMS)

Error Return Values: None The Disable Calibration Button Command deactivates

the calibration button.

Command Number: 40 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Error Return Values: None Load the default settings into RAM, and non-volatile

RAM.

Command Number: 0x94 (Hexadecimal)

4-13

HI 1756-WS WEIGH SCALE MODULE

Channel Number: 0 or 1 Number of Elements: 8

Error Return Values: None

Cal Low Command (CALLOWCMD)

Cal High Command (CALHIGHCMD)

The Cal Low Command sets the “calLowCount” parameter to the current A/D average counts when doing a hard calibration. An Integrated Technician function gets called during low calibration.

Command Number: 0x64 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Error Return Values:

• STATUS WORD - there was a conversion error, weight in motion or an A/D error or all three.

• HARDCALFAILCOUNTS - less than 100 counts between the zero and the span weights.

The Cal High Command - Sets the Span Weight parameter to the current A/D average counts when doing Hard CAL.

Command Number: 0x65 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Error Return Values:

C2 Cal Command (C2CALCMD)

4-14

• STATUSWORD - there was a conversion error, weight in motion or an A/D error or all three.

• HARDCALFAILCOUNTS - there are less than 100 counts between the zero and the span weights.

The C2 Cal Command - Performs a C2 Calibration. Uses CalLowWeight as the reference point.

Command Number: 0x66 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Chapter 4 - Setup

Error Return Values:

• STATUSWORD - there was a conversion error,

weight in motion or an A/D error or all three.

• C2FAILNODEVS - detected no C2 load cells.

• C2FAILCAPEQ - detected two load cells with

different capacities.

Read Weight Cal Command (

READWEIGHTCAL)

Perform Integrated Technician Tests (WEIGHSYSTEST)

Weight data at calibration points are saved. The Read Weight Cal Command reads in the values, letting you compare raw counts at current input and counts at cal ibration points to ensure the the scale is returning correct input from each calibration point before running new calibration command.

Command Number: 0x63 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Return Values: Command (DINT)

Channel (DINT) Status (DINT) Zero counts (DINT) Cal zero counts (DINT) Cal low counts (DINT) Cal high counts (DINT) CalibK (weight per count) (REAL) ADC (as of the time the command is given) (DINT)

Performs the Integrated Technician tests.

Command Number: 0x6D (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 16 Status nSensors: Number of Sensors.

4-15

HI 1756-WS WEIGH SCALE MODULE

Structure (ITECHTEST)

Structure Item Description

DINT command* 0x66

DINT channel* 0 or 1

DINT status* N/A

DINT nSensors* Number of load sensors.

REAL BaseR Load cell impeda nc e measured during Calibrati on

REAL ReadR Impedance measured at test time

DINT TestR Test Result: Good = True, Bad = False

REAL Vsense Sense Voltage from the load cells

REAL loadcell current Load Cell Current

DINT RTZ_R_combined Test result, return to zero, al l lo ad cells

DINT RTZ_R_1** Test result, return to zero, load cell 1

DINT RTZ_R_2** Test result, return to zero, load cell 2

4-16

DINT RTZ_R_3** Test result, return to zero, load cell 3

DINT RTZ_R_4** Test result, return to zero, load cell 4

REAL DVM_combined Millivolts/Volt, all load cells

REAL DVM_1** Millivolts/Volt, load cel l 1

REAL DVM_2** Millivolts/Volt, load cel l 2

REAL DVM_3** Millivolts/Volt, load cel l 3

REAL DVM_4** Millivolts/Volt, load cel l 4

REAL IREF_weight Internal refe rence counts, converted into a weight

REAL JBOXREF_weight JBOX reference counts, c onverted into a weight

REAL grossweight Combined Gross Weight, all load cells

REAL weight_1** Gross We ig ht, lo ad cell 1

REAL weight_2** Gross We ig ht, lo ad cell 2

REAL weight_3** Gross We ig ht, lo ad cell 3

Structure Item Description

REAL weight_4** Gross We ig ht , lo ad cell 4

NOTE: * Required Command Data

* * Available only with the HI 215IT Junction Box.

Chapter 4 - Setup

Search for C2 Load Sensors (C2SEARCH)

Read C2 Sensor Serial Number (READC2SERIALN UM)

Searches for C2 Load Sensors

Command Number: 0x6E (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Return Values:

• COMMAND

• CHANNEL

•STATUS

• C2ROM - The number of C2 sensors detected.

• C2SWITCH - The number of JBOX switches detected.

• CAPACITY - Combined sensitivity of C2 load cells.

• SENSITIVITY - Combined sensitivity of C2 load cells.

Reads the serial number of a specified C2 load sensor. Must be preceded by the C2SEARCH command. Command Number: 0x70 (Hexadecimal) Required Command Data:

• COMMAND

• CHANNEL

• SENSOR # (0-7 Number of specific Load Cell Requested)

• Number of Elements: 12

4-17

HI 1756-WS WEIGH SCALE MODULE

Return Data:

• COMMAND

• CHANNEL

•STATUS

• 9 DINT SERIAL NUMBER

Error Return Values:

• OUTOFTOLERANCE - No C2 Sensor found.

Read Status of Module (GETSTATUS)

NOTE: See the Timed Out Command sectio n.

Write Parameters (WRITEPARAM)

Reads the condition of the module.

Command Number: 0x80 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Return Data:

• COMMAND

• CHANNEL

• STATUS - Returns status of the last timed out command.

Writes all the parameters.

Command Number: 0x68 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 84

Return Data:

• COMMAND

• CHANNEL

4-18

• STATUS - The status is 0 if the command succeeded. If there was a range error detected in one of the parameters, a non-zero value is returned indicating which parameter failed its range. (See Table 4-1)

Chapter 4 - Setup

Read Parameters (READPARAM)

Read Live Weight

(READLIVEWEIGHT)

Reads all the parameters.

Command Number: 0x69 (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Return Data:

• COMMAND

• CHANNEL

•STATUS

• PARAMETERS (See Table 4-1)

Reads gross weight in units set by the Metric Parameter, either lbs or kgs.

Command Number: 0x6B (Hexadecimal) Channel Number: 0 or 1 Number of Elements: 8

Return Data:

• COMMAND

Command Table

• CHANNEL

• STATUS = STATUSWORD

• Gross weight in units determined by the Metric Parameters

•Net Weight

• Rate of Change

• ADC value (A REAL number between 1.0 and

2.0)

Command

ZERO* 1

Number

(Hex)

4-19

HI 1756-WS WEIGH SCALE MODULE

Command

TARECMD* 2

WRITENONVOLATILE* 4

RELOADNONVOLATILE* 0x10

GETSTATUS 0x80

ENABLEBUTTONCMD** 0x20

DISABLEBUTTONCMD** 0x40

SETDEFAULTPARAMS 0x94

CALLOWCMD* 0x64

CALHIGHCMD* 0x65

C2CALCMD* 0x66

WRITEPARAM 0x68

READPARAM 0x69

WEIGHSYSTEST 0x6D

C2SEARCH 0x6E

READC2SERIALNUM 0x70

Number

(Hex)

READLIVEWEIGHT 0x6B

NOTE: * These commands can be sent through the output

table. (See Below)

** Newly added

Output Table

Output (Commandword)

16 bits 16 bits

Channel 1 Channel 0

4-20

The least significant 16 bits are a command for Channel 0, the next 16 bits are a command for Channel 1.

Commands are “1 shot”, occurring upon a 0-1 transition.

Bit 0x2000 in the STATUSWORD will be set upon completion of the output table comand. Bit 0x4000 will also be set if the command failed. Setting the command word to zero will clear these status bits.

Error Code List SUCCESS 0

OUTOFTOLERANCE -3 NOSUCHCMD -5 C2FAILNODEVS -6 C2F AILCAPEQ -7 (failure, capacities not

HARCALFAILCOUNTS -8 (failure, not enough

Chapter 4 - Setup

equal)

ADC counts b e tw e e n high, low)

Timed Out Commands

Return Codes See Chapter 7, Troubleshooting.

The ASIC on the HI 1756-WS module requires that a command receive a reply within 65 milliseconds. This is not enough time to complete some of the com mands. The commands subject to time-out are:

•CALLOWCMD

•C2CALCMD

• WEIGHSYSTEST

•C2SEARCH

The reply to these commands is sent before the commands are actually performed. To see if a calibration has succeeded, the command “GETSTATUS” can be sent

The data returned by the WEIGHSYSTEST and C2SEARCH commands is actually the data deter mined by an earlier command. In practice, these commands need to be sent twice .

4-21

HI 1756-WS WEIGH SCALE MODULE

Calibration Setup Procedures

Setting the Unit of Measure

Setting the Motion Tolerance Value

Setting the Zero Tolerance Value

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

Setting the Auto Zero Tolerance Value

The Unit of measure can be set to either kilograms or pounds. Any weight value input to the module (e.g. CALLOWWEIGHT, SPANWEIGHT) are in the cur rently selected units. The unit of measure can be set at any time, not just at calibration. Setting the unit of measure before calibrating reminds the us er what unit of measure is being displayed. It is important t o note that the weigh scale module does not need to be cali brated again after changing the unit of measure.

The motion tolerance is the tolerance value used to determine if the scale is in motion.

Sets the range of weights so that the Zero Command works as an offset of the calibrated Zero.

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

When the Auto Zero Tolerance is entered and Auto Zero Tracking is enabled, any weight within the entered tolerance of zero and not in motion will cause the display to automatically read zero.

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

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

NOTE: There is a short time delay (at least 1 second) before

the Auto Zero Triggers.

Setting the Number of Readings Averages

4-22

The Number of Averages sets the number of weight readings which will be used to compute the displayed weight. The average is a sliding average so that a new average reading is available for display at every read ing.

Chapter 4 - Setup

Setting the Span Weight Value

Setting the WAVERSAVER

Value

The Span Weight is a reference point derived from an actual measured weight. This should not be confused with the Scale Capacity. If you have a 100 pound weight and you place it on the scale, the Span Weight would be 100 pounds.

There are 5 selectable levels. 0 provides the least vibration immunity with the fastest response time. 4 provides the most vibration immunity with the slow

est response time. Default setting is 2.

Immunity Setting

7.5 Hz 0

3.5 Hz 1

1.0 Hz 2

0.5 Hz 3

0.25 Hz 4

4-23

HI 1756-WS WEIGH SCALE MODULE

4-24

CHAPTER 5 - CALIBRATION

Chapter 5 - Calibration

A Brief Description of Chapter 5

NOTE: Do not perform a calibration while the application is

Pre-Calibration Procedures

Chapter 5 provides the recommended calibration procedures for the HI 1756 (WS or 2WS) Weigh Scale Module. For the module to work properly, it must be calibrated prior to operation, and it should be re-cali brated periodically or when not in use for extended periods of time. Be sure to follow all the procedures completely to insure that the weights read by the mod ule are accurate. Users and service personnel should be familiar with the procedures in this chapter before installing or operating the Weigh Module.

in operation.

Step 1. Determine if the load cells have been

properly installed. See your load cell I&M manual for proper installation instructions.

Step 2. An arrown on some sensors and cells indi-

cates the correct direction of the applied load. If the arrow points in the wrong direction, reposition the load cell.

Step 3. Check for Binding on the Load Cell or

other parts of the weighing system.

CAUTION: BINDING ON A SCALE/VESSEL OR LOAD

CELL CAN DENY THE LOAD CELL FREE VERTICAL MOVEMENT AND PREVENT THE INSTRUMENT FROM RETURNING TO THE ORIGINAL ZERO REFERENCE POINT.

• Mount load cells so that 100% of the load (Vessel

w/Contents) passes vertically through a cell. (See Fig. 5-1)

• Veri fy that nothing is binding the load cell. No, hose, electrical cord, tube, or other object should be draped across the scale/vessel or the load cell.

• Ensure that nothing contacts the scale/vessel other than service wires and piping that have been properly mounted with flexible connectors.

5-1

HI 1756-WS WEIGH SCALE MODULE

FIG. 5-1 PROPERLY INSTALLED LOAD CELL W/NO BINDING

Electrical Check Procedures

Load Cell/Point Input/Output Measurements

5-2

Step 4. Typical Load Cell/Point Input/Output

Measurements (EXC & SIG Outputs)

a. The Weigh Module is designed to sup-

ply 5 VDC excitation to as many as eight 350 Ohm load cells/points.

b. The expected output from each load

cell/point depends on the mV/V rating of the load cell/point and the weight. For example, a 2mV/V load cell/point will respond with a ma ximum of 10 mVDC at full system weight capacity, which includes the weight of the vessel and the weight of the product as mea sured by the load cell/point. If the load cell/point weight capacity is rated at 1000 pounds, the load cell/point will be 10 mVDC at 1000 pounds, 7.5 mVDC at 750 pounds, 5 mVDC at 5 00 pounds.

Chapter 5 - Calibration

c. A zero reference poin t will vary from

system to system depending on the “Dead Load” of the vessel. “Dead Load” is the weight of the vessel and appurte nances only, with no product loaded. In our example we will assume the dead load to be 500 pounds. (See Fig. 5-2)

FIG. 5-2 MILLIVOLTS/WEIGHT SCALE

Based on the example, the operating range for this scale is 5-10 mVDC with a 500 pound weight range. Understand that after zeroing the instrument, the 0 reading refers to the zero reference point and not absolute 0 mVDC or absolute 0 weight.

NOTE: Load cell/point measurements are checked with a dig-

ital volt meter at the J2 connector on the front of the module or by using I

NTEGRATED TECHNICIA N with the

HI 215IT Junction Box.

Load Check Step 1. Place a load (weight) on the scale or vessel

and check to see if the weight reading changes on the ladder logic display in the proper direction.

5-3

HI 1756-WS WEIGH SCALE MODULE

Step 2. If the ladder logic display changed weight

C2 Calibration

• For example: If the ladder logic display reads 100 pound s and a 20 pound weight is placed on the vessel or scale, the ladder logic display should read 120 or some value over 100.

• If the ladder logic display reads 100 pounds and a 20 pound load is placed on the vessel or scale and the reading is 80 pounds, the reading is going in the wrong direction and indicates some problem with the system.

• If the ladder logic display is reading improperly or shows no change there is something wrong with the setup.

in the proper direction, remove the weight and proceed to calibrate the module.

About C2 Calibration

“THE BUTTON” C2 Calibration

5-4

C2 calibration requir es C2 l oad s ens ors . If y ou d o not have C2 load sensors you must perform a traditional calibration with test weights which we call a Hard Calibration. The Weigh Module reads the perfor mance characteristics of each individual load cell and detects the quantity of load cell(s) in the system. C2 Calibration can be performed by pressing “The But ton” located in the front of the module, or via Allen Bradley RS LOGIX 5000.

Step 1. Be sure that the parameters have been

setup for your weighing process. (See

Chapter 4, Setup) Step 2. Open the front door of the module. Step 3. Press and hold “The Button” until the

desired Scale LED turns green, and release

it when the Scale LED flashes green. (See

Fig. 5-3 & 5-4)

Chapter 5 - Calibration

FIG. 5-3 “THE BUTTON” C2 CALIBRATION -

HI 1756-WS

FIG. 5-4 “THE BUTTON” C2 CALIBRATION -

HI 1756-2WS

NOTE: If the module is being calibrated for the first time and

you are not sure what parameters to set, use the default parameters which are set by the module at power up. Once the calibration is successful, feel free to change the parameters to meet the requirements of your weighing process. (See Chapter 4 - Setup) Use the Button for calibration at any time after the weigh ing process parameters have been set.

5-5

HI 1756-WS WEIGH SCALE MODULE

Step 4. Press “The Button” again to perform the

C2 Calibration. Once the calibration is

completed the Scale LED returns to a

steady green.

NOTE: If you do not press the Button again within 20 sec-

onds, the calibration process times out.

C2 Calibration Using Ladder Logic

Step 1. Check to be sure that the parameters have

been setup for your weighi ng process. (See

Chapter 4, Setup) Step 2. We have provided a Ladder Logi c example

explaining how to perform the C2 Calibra

tion. The Ladder Logic example is avail-

able on the Hardy Instruments Inc. Web

Site:

http://www.hardyinst.com

Step 3. Click on “Support”. Step 4. Click on “Sample Programs”. Step 5. You will find the sample programs under

the HI 1756-WS Heading.

Hard Calibration Hard Calibration is the traditional method of calib r a-

tion that uses test weights. Hardy recommends that the test weights total 80 to 100% of the scale capacity.

Hard Calibration Procedures

Step 1. Place the low calibration weight (the

weight can be zero) on the scale. Step 2. Send a Cal Low Command (CALLOW-

CMD)

5-6

• The Cal Low Command - sets the “calLowCount” parameter to the cur rent A/D average counts when doing a hard calibration. An Integrated Tech nician function gets called du ri ng low calibration.

• Command Number: 0x64 (Hexadecimal)

• Channel Number: 0 or 1

• Number of Elements: 8

Chapter 5 - Calibration

• For more information on the Cal Low

Command go to Chapter 4, Setup, page 4-11.

Step 3. If you used a weight remove it from the

scale.

Step 4. Place the high (Span) calibration weight

on the scale.

Step 5. Send a Cal High Command (CAL-

HIGHCMD).

• The Cal High Command - Sets the

Span Weight parameter to the current A/D average counts when doing Hard CAL.

• Command Number: 0x65 (Hexadeci-

mal)

• Channel Number: 0 or 1

• Number of Elements: 8

• For more information on the Cal High

Command go to Chapter 4, Setup, page 4-12.

Hard Calibration Ladder Logic Example

Step 6. Remove the weight from the scale. Step 7. Send a Write Non-Volatile Command

(WRITENONVOLATILE).

• The Write Non-Volatile Command -

causes all parameters (including cali bration constants) to be saved to the non-volatile memory.

• Command Number: 4 (Hexadecimal)

• Channel Number: 0 or 1

• Number of Elements: 8

Step 1. Check to be sure that the parameters have

been setup for your weighi ng process. (See Chapter 4, Setup)

Step 2. We have provided a Ladder Logi c example

explaining how to set the weigh process parameters. The Ladder Logic example is

5-7

HI 1756-WS WEIGH SCALE MODULE

Step 3. The Hard Calibration Ladder Logic Exam-

a. Type the following URL:

b. Click on the Support button. c. Click on Sample Programs. d. Click on the pull down menu for the

e. Click on the Ladder Logic Example for

Step 4. If you do not have access to the Internet,

meant to provide a ladder logic model only. Your application may vary and the example may or may not meet your requirements.

ple is located at the Hardy Instruments Inc. Web Site. If you have access to the Inter net:

http://www.hardyinst.com

product you are calibrating.

the HI 1756-WS Weigh Module, Hard Calibration.

call your local Hardy representative or Hardy Instruments, Cu sto mer Sup port an d we will forward you a hard copy of the calibration ladder logic explanation and ladder logic example.

5-8

Chapter 6 - Operating Procedures

CHAPTER 6 - OPERATING PROCEDURES

A Brief Description of Chapter 6

Input Data This is the discrete input data which is in module

#0* Bits 15-0: STATUSWORD for Channel 0

Chapter 6 covers the operation of the HI 1756 (-WS and -2WS) Weigh Scale Modules. The Operating Pro cedures include Reading data transferred to the PLC from the weigh scale module. (See Fig. 6-1)

FIG. 6-1 COMMUNICATION

CONFIGURATION DIALOG BOX

defined data type, LOCAL:X:I (where X is the slot number). (See Fig. 6-2)

Bits 31-16: STATUSWORD for Channel 1

#1 Gross Weight: 5 #2 Net Weight: 6 #3 Rate of Change: 7 #4 loadcellcurrent (milliamps): 8 #9, #10 TimeStamp

NOTE: The TimeStamp is a 64 bit integer, giving the system

time in microseconds

6-1

HI 1756-WS WEIGH SCALE MODULE

FIG. 6-2 DISCRETE DATA

6-2

CHAPTER 7 - TROUBLESHOOTING

CHAPTER 7 - Troubleshooting

A Brief Description of Chapter 7

Scale LED stays off when Performing a C2 Calibration with The Button

Scale LED is Flashing Red

Return Codes When any command is sent to the HI 1756 WS mod-

Chapter 7 covers troubleshooting and problem resolution. Maintenance personnel and users should be familiar with Chapter 7 before attempting to repair the HI 1756-WS or HI 1756-2WS.

If the scale LED does relight when running C2 Calibration (pressing the button), there is probably a hardware problem. Contact Hardy Customer Support for assistance.

Solution: Check all the connections to be sure they are securely fastened. Securely fasten any loose con nections.

ule using an MSG instruction, a returned status indicates whether the module passed or failed. It also provides a reason code if it failed.

Fig 7-1 shows the over-all process. There are three possible status returns for most commands: 0 (pass or success), a positive value (status or condition code), or a negative value (error code). Fig 7-1 separates out the Write Parameters command for which a return value, if not 0, is the index value of th e first parameter that is out of tolerance. Values for the Write Parame ters command are displayed on the figure.

Fig 7-2 expands on the positive and negative values shown as A1 and A2 in Fig 7-1. It shows sequence numbers for a definition (B#) and the action to take (C#) for each code. For example B1 is listed as a defi nition and C1 as an action. Table 1 uses the same sequence numbers to provides the detailed informa tion for each definition and action listed in Fig 7-2.

7-1

HI 1756-WS MANUAL

Yes

Run Cmd

Cmd Passed

Is Cmd a Write Parameter?

Status 0

Status = 0?

Cmd passed

Is Status Positive?

Is Status

tive

Nega ?

Index of return values for Write Parameter

1. CALACTIVE

2. CALYEAR

3. CALMONTH

4. CALDAY

5. CALID

6. CALIB TYPE

7. TAREWEIGHT

8. METRIC

9. WAVERSAVER

10. SPAN WEIGHT

11. CAL LOW WEIGHT

12. NUMBER AVERAGES

13. ZERO TRACK ENABLE

14. ROC TIME BASE

15. ZERO TOLERANCE

16. AUTO ZERO TOLERANCE

17.MOTION TOLERANCE

7-2

FIG. 7-1 COMMAND RETURN PROCESS

CHAPTER 7 - Troubleshooting

Yes

Status = -3

Yes

Status = -5

Yes

Status = -6

Yes

Status = -7

Yes

Status = -8

Yes

Definition Action

Definition Action.

FIG. 7-2 COMMAND DEFINITIONS AND ACTIONS

Name / Code # Definition Action

erroradconvert 1 B1: Load cell input out of range

erroradfailure 2 B2: Output from the A/D con-

statusinmotion 64 B3: The rate of scale weight

C1: Check the voltage levels to

(i.e., voltage not 0-15 mV and flashing red LED wil l display). Can result from overloaded or mismounted load cell.In this state weight readings do not repond to changes.

verter to processor is bad. The

the module from each load cell. +5 V for excitation and sense lines and 0 - 15 mV on signal lines. If voltage is bad, to find a problem load cell, disconnect each one at the summing box.

C2: Contact Customer Support to return module for repair.

module shows a solid red LED.

change over 1 second exceeds the motion tolerance setting. If the setting is too low, motion may be indicated when no

C3: If the weight is actually changing, stabilize it. If not , increase the motion tolerance set ting until the motion bit goes off with static weight.

changes are occurring.

7-3

HI 1756-WS MANUAL

Name / Code # Definition Action

erroreepromwrite 256

success - 0 Command passed. No errors None outoftolerance -3 B5:

nosuchcmd - 5 B6: The command number is

c2failnodevs - 6 B7: When trying to do a C2 cali-

c2failcapeq - 7 B8: C2 load cells have unequal

B4: Module cannot write (save settings) to non-volatile mem ory. EEPROM is probably bad.

1. Occurs with the Zero cmd when zeroing the current weight exceeds the tolerance limit.

2. Occurs with the Read C2 sensor serial number cmd if the sensor number is out of r a nge.

invalid

bration, the module cannot read the data from the load cells.

cap-acities due to either the use of mismatched load cells or faulty C2 programming.

C4: Contact Customer Support to return module for repair.

C5:

1. Recalibrate the scale, remove weight causing the deviation fro m the calibration zero point, or increase the zero tolerance limit , but do not set the limi t so high that th e batch could be out of tolerance.

2. Check the C2 sensor number s entered to ensure that they match the actual C2 censors.

C6: Check the comand code to see if the sent command number exists.

C7: Check the wiring to ensure proper connections and ori enta tion. Find the problem loa d cell by disconnecting them at the sum ming box.

C8: Run the Read C2 Sensor cmd for each load cell and check for difference. Find a problem load cell by disconnecting each one at the summing box.

harcalfailcounts -8 B9: Too few A/D counts

between zero and span points during hard calibration. Scale input may be higher at the low cal point than previous hi gh cal point. (Cell in-put must change by a minimum amount between the low and high cal points.)

7-4

C9: Add wei ght to sc al e an d see if readings increase. Check voltages as in erroradconvert. If error is on Cal Low cmd, try plac ing weight on the scale and running Cal High before running Cal Low.

Mechanical Inspection See Fig. 7-1

All pipes and conduits

flexible?

Mechanically isolated

from ladders and

connecting structures?

1) Floors or structure does not interact.

2) Local traffic does not interact

3) Protected from forklifts and adjacent processing equipment

Are the load cells properly

mounted?

Are Check rods installed

to dampen vessel

movement?

1) Protects the load cells from overload and impact forces

2) Limits the movement of the vessel

3) Rods must be loose and not interacting with the vessel.

Are cables routed

properly?

1) Product, tools and production aids are off the vessel.

2) No workers are physically on the scale

3) Must protect equipment from environmental damage

4) Insure openings are sealed to keep water and environmental contaminates from damaging: (a) Instrument cabinet or enclosure (b) Summing card (c) Load Cells (d) Conduit runs (e) covers are properly installed

1) Keep flexures on the horizontal

2) Vertical flexures should be avoided

3) Do not use flexures to correct for misaligned piping

4) Do not use hose flexures to make right angle bends

5) Non-flexed piping should have an unsupported horizontal run using a ratio of 36 times it's diamet er .

6) Pipe flexure lengths should be a ratio of 6 times it's diameter

7) Feed and discharge piping flexed

8) Are the flex joints on the correct side of the valve ? (a) You weigh the output valve, not the input valve (b) Does the weigh scale see all the product to be

weighed?

pipe or valve must be included in the weigh vessel. (d) Proper positioning of the flexures are key. (e) Your vessel must seem to float.

1) Separate conduit for low and high voltage cables.

2) Do not bundle Low voltage with High voltage cables

3) Maintain at least 3 inches of seperation.

4) Maintain 14"seperation from magnetic fields and 440 vac.

5) Cables are in conduit or tied up and protected from damage.

1) Level, solid mounting base

2) The load cell is mounted right side up.

3) All load cell bolts installed using anti-seize compounds.

4) Mechanically aligned to compensate for expansion and contraction.

Housekeeping

CHAPTER 7 - Troubleshooting

FIG. 7-3 MECHANICAL INSPECTION

7-5

HI 1756-WS MANUAL

Load cell wiring is

complete and correct?

1) Does the mV signal increase in a positive directi on.

2) If you receive a negative results, check if l oad cell is mounted correctly. a) The arrow goes with the direction of force. b) If there isn't an arrow, you must manually verify the

correct direction. A negative reading indicates the load cell is upside down.

c) Load cells in tension will not reflect a negative

reading if install upside down. If upsi de dow n, only the force applied by the cable would be included in the weight readings.

d) If you are still receiving a negative signal, verify

load cell wire color code

Multiple load cells? MAP the mV reading. Balance the load

1) Verify a positive reading from each load cell, using a volt meter.

2) Record the mV reading and compare each corner for proper load sharing. a) Proper load sharing should see only a di fference

of +/- .5 mV.

b) Larger differences due t o m otors and piping,

should not exceed +/- 2 mV.

c) If there isn't any motors, valves, or piping to

explain the mV difference, adjust t he corners and balance the mV readings.

d) Use shim s, or i f equi pped adjusting bolts on the

load cell mounting hardware.

e) Drawing a load cell map will help determine the

correct leg to adjust and in which direction.

Three load cells balance like a three legged chair.

1) Using a sprit level, verify the vessel is vertically and horizontally correct.

2) Verify if any height change will effect the attitude of adjacent vessels or piping.

3) Adjust each legs to dynamically match mV out puts

4) Verify the mV readings and physical level when complet e.

Four load cells or more present a challenge.

1) Use volt meter to determine the sum of the load cell signals and your target mV setting for each load cell .

2) Read the output of individual load cell s.

3) Adjust the load cell with the lowest reading to dynamically match the target mV readings obtained in step 1.

4) Read the mV readings from each load cell to verify a proper correction.

5) Repeat step 3 and 4 to achieve a proper load sharing vessel.

6) Verify the mV readings and vessel level when complete.

Load Sharing and Load Sensor Checkout

See Figure 7-4

FIG. 7-4 LOAD SHARING AND LOAD SENSOR CHECKOUT

7-6

CHAPTER 7 - Troubleshooting

Check for

Electrical Stability

OK ?

Contact Hardy

Instruments

Customer Support

Check for

Mechanical Stability

OK ?

Yes

Check Configuration

settings for

Stability

OK ?

Yes

Guidelines for Instabilities on Formerly Operating Systems

See Figure 7-5

FIG. 7-5 GUIDELINES FOR INS TABILITIES ON

FORMERLY OPERATING SYSTEMS

7-7

HI 1756-WS MANUAL

Electrical

B1.1

Physical Grounding -

All common equipment share a common ground point. Keep the ground cable length to earth ground as short as possible. Install a new ground rod if the cable length is excessive.

B1.2

B1.3

B1.4

B1.5

B1.6

Cable -

Cuts or breaks in the loadcell cable insulation allow moisture to wick

into the cable and loadpoints. This can setup stray capacitance

charges and allow ground current to exist. This could create a highly

intermittent situation.

Loadcells -

Ground straps must be installed to provide a direct discharge path to ground around the load points.

Vessel, Fill and discharge piping -

Ground all to a common point to eliminate electrical differences in potential, and static build-up.

Cable Routing -

Separate high voltage sources and cables from low voltage signal cables.

Stay a minimum of 14 inches from Magnetic fields and SCR controls. Avoid parallel high voltage and signal cable runs.

Cable Shielding -

Ground low voltage cable shields only at the controller end. Grounding both cable ends will produce ground currents. Verify with an ohm meter that the shield is only grounded at the weight controller. Disconnect the shield at the controller and check for an open circuit between ground and shield. Reconnect the shield to ground and confirm a proper ground path from the Junction box to the controller. Verify the shield is not connected to ground at the Junction Box. Loadcell cable shields only pass thru the Junction Boxes and are not connected to ground at that point

GOTO

Electrical See Figure 7-6

7-8

FIG. 7-6 GUIDELINES FOR INSTABILITIES ON FORMERLY

OPERATING SYSTEMS - ELECTRICA L

CHAPTER 7 - Troubleshooting

Mechanical Stability

Vessel -

When inspecting a vessel keep in mind, the Center of Gravity (COG) should be low and centered equally over all the load cells. Insure the load is directly over or under the load point to avoid side-loading. Insure there isn't any side loading from piping or external forces. Install flexures on all piping to insure a free float ing v es s el. Insure the vessel and loadcell mounts are mechanically s t able and fixed. Large changes in individual Loadcells indicate a shift in COG orfaulty Loadcells.

Piping and motors will effect the individual loadcell readings. Allow for a higher reading on Loadcells that support motor s and piping.

Insure pneumatic lines are not applying pressure to t he v es s el when energiz ed. Use check (stay) rods to minimize vessel movement.

Insure the check rods are loose and not interacting with the vessel. Power down all vibration, vacuum and pressurization equipment dur ing t he test

process.

Configuration settings

Incorrect Waversaver settings

can cause unstable weight readings

Adjust to the lowest WS setting that gives you a stable reading. Higher frequencies with low amplitude vibrations; - Use WS settings 2 or 3 Low frequency with high amplitude vibrations; - Use W S s et ting 0 or 1.

Repeatability -

Divide the total loadcell capacity, including decimal point s , by load c ell div is ions, 1,000 to 10,000. (expected stable weight reading).

Resolution -

Divide the total loadcell capacity, including decimal point s , by 30,000. (The amount you can expect to see, but not nec es sar ily s t able)

Stable ?

Yes

Contact Hardy Instruments Customer Support

Mechanical Stability and Configuration Settings

See Figure 7-7

FIG. 7-7 MECHANICAL STABILIT Y AND CONFIGURATION SETTINGS

7-9

HI 1756-WS MANUAL

7-10

Index

Symbols

“dead” loads 1-2 “The Button” 1-2 “THE BUTTON” C2 Calibration 5-4

Numerics

1756 RTA (Remote Termination Assembly 2-3 350 Ohm load cells/points 5-2 5 VDC excitation 5-2

A Brief Description of Chapter 2 2-1 A Brief Description of Chapter 3 3-1 A Brief Description of Chapter 4 4-1 A Brief Description of Chapter 5 5-1 A Brief Description of Chapter 6 6-1 A Brief Description of Chapter 7 7-1, 7-8 A/D average counts 4-14, 5-7 abnormal mechanical forces 1-4 About C2 Calibration 5-4 About Hardy Manuals 1-1 About Parameters 4-8 About the Module I/O Connector 3-4 AC or high voltage DC module 3-2 Allen-Bradley Control/Logix® 1-2 Allen-Bradley RSLinx™ 4-1 Allen-Bradley’s RS Logix 5000 4-1 analog to digital converter 1-2 Approvals 2-2 Auto Zero Tolerance 1-5 Auto Zero Tracking 1-5 Averages 2-1

Index

Backplane Current Load 2-2

HI 1756-WS MANUAL

Backplane Input Voltage 2-2 Backplane Power Load 2-2 Before signing 3-1 Binding 5-1

C2 Cal Command (C2CALCMD) 4-14, 4-15 C2 Calibration 5-4 C2 Calibration Input 2-2 C2 Calibration Output 2-2 C2 Calibration Using Ladder Logic 5-6 C2 load sensors 5-4 C2® Calibration 1-3 C2FAILCAPEQ 4-21 C2FAILNODEVS 4-21 C2ROM 4-17 C2SEARCH 4-21 C2SWITCH 4-17 Cable lengths 2-2 Cal High Command 5-7 Cal High Command (CALHIGHCMD) 4-14 Cal Low Command 5-6 Cal Low Command (CALLOWCMD 4-13 Calibration Setup Procedures 7-5 calLowCount” parameter 5-6 CALLOWWEIGHT 4-21 CHANNEL 4-17 Channel Number 4-12 Class Name 4-2, 4-11 Command Number 4-12 Command Table 4-19 Commands 4-11 Common-Mode Rejection 2-1 Common-Mode Voltage Range 2-2 Configuration 1-2 configuration data 4-4 ControlLogix Chassis 3-2

ControlLogix I/O 1-2 Conversion Rate 2-1 Customer Support Department 1-1

damaged load sensors 1-4 Dead Load 5-3 Default Parameters 2-3 Description 1-2 Digital Volt Meter 1-4 Digital Voltmeter 2-2 DINT 4-8 discrete input data 6-1 dual channel 1-2 DVM 1-4 DVM readings 1-4

Electrical 7-8 Electrical Check Procedures 5-2 electrostatic discharge 3-1 Environmental Requirements 2-2 Error Code List 4-21 Error Return Value 4-12 Error Return Values 4-12 EXC & SIG Outputs 5-2 Excitation Monitor 1-3, 2-1 excitation wire(s) 1-3

Index

Filling Operation is a Gain-in-Weight process 7-3 flexible connectors 5-1

GETSTATUS 4-21 Guidelines for Instabilities on Formerly Operating Systems 7-7

HI 1756-WS MANUAL

HARCALFAILCOUNTS 4-21, 7-4 Hard CAL 4-14, 5-7 Hard Calibration 5-6 Hard Calibration Ladder Logic Example 5-7 HARDCALFAILCOUNTS 4-14 Hardy HI 215IT Junction Box 3-9 Hardy Instruments C2 certified load sensors 1-3 Hardy Load Sensor with C2 3-6 HI 1756 Remote Terminal Assembly 3-7 HI 215IT Junction Box 1-4 HI 215IT Series Junction Box 1-4, 2-3, 3-4 high voltage cables 3-2 http

//www.hardyinst.com 5-6

Humidity Range 2-2

I/O Config folder 4-2 Illegal values 4-4 INDEXOUTOFRANGE 4-21, 7-4 Industry Standard Load Cells 3-6 Input 2-1 Input Data 6-1 install 1-1 Installing the HI 1756-WS (-2WS) 3-1 Installing the Module I/O Connector 3-4 Instance Name 4-2, 4-11 Integrated Technician 5-3 Integrated Technician™ 1-3 IT 1-3 IT Junction box 1-4

ladder logic 1-1 ladder logic display 5-4 Ladder Logic example 5-6

LEDS 4-2 Load Cell Excitation 2-2 Load Cell Wiring Diagrams 3-6 Load Cell/Point Input/Output Measurements 5-2 Load Check 5-3 Load Sharing and Load Sensor Checkout 7-6 loose connections 3-4

Mechanical Inspection 7-5 Mechanical Stability and Configuration Settings 7-9 Message Type 4-2, 4-11 Model and Serial number 3-1 Module Properties 4-3 mV 1-4 mV/V rating 5-2 mV/V readings 1-4

NEVER touch the connector pins 3-2 Non-Linearity 2-1 NOSUCHCMD 4-21, 7-4 NOTALLOWED 4-21 Number of Elements 4-12

Index

OK Module Status LED 4-2 Operating Temperature Range 2-2 Optional Equipment 2-3 OUTOFTOLERANCE 4-12, 4-21 Output Table 4-20 Overview 1-1

Parameters 4-8 Parameters for the HI 1756-WS (-2WS) Module 4-8 PCB Guides 3-2

HI 1756-WS MANUAL

Perform Integrated Technician Tests (WEIGHSYSTEST) 4-15 pin-out diagram 3-4 Pre-Calibration Procedures 5-1 Processor Releases 3-2

Read C2 Sensor Serial Number (READC2SERIALNUM) 4-17 Read Live Weight (READLIVEWEIGHT) 4-19 Read Parameters (READPARAM) 4-18 Read Status of Module (GETSTATUS) 4-18 Reading data 6-1 REAL 4-8 Reload Non-Volatile (RELOADNONVOLATILE) 4-13 Remote Rack 1-2 Remote Terminal Assembly 3-4 Remote Termination Assembly 1-1 Removing the Module from the Chassis 3-3 Report any damage 3-1 Resolution 2-1 Return to Zero Test 1-4 RPI 4-3 RSLinx™ Lite 4-1 RTA Cable Assemblies 2-3 RTA Cable Assembly 3-8

Sample Programs 5-6 Scale Capacity 4-22 Scale Data LEDs 4-2 Scale LED does not Come Back on 7-1 Scale LED is Flashing Red 7-1 Search for C2 Load Sensors (C2SEARCH) 4-16 Set Default Parameters (SETDEFAULTPARAMS) 4-13 Setting the Auto Zero Tolerance Value 4-22 Setting the Motion Tolerance Value 4-22 Setting the Number of Readings Averages 4-22 Setting the Span Weight Value 4-22

Index

Setting the Unit of Measure 4-21 Setting the WAVERSAVER Value 4-22 Setting the Zero Tolerance Value 4-22 Setting Up Communications Between the PLC and the HI 1756-WS (2WS) 4-2 Setup 1-2 Span Weight 4-22 Span Weight paramete 4-14, 5-7 SPANWEIGHT 4-21 Specifications 1-1 Specifications for a Standard HI 1756-WS 2-1 STATUSWORD 4-12, 4-14 Storage Temperature Range 2-2 Structure (ITECHTEST) 4-15 SUCCESS 4-21

Tare Command (TARECMD) 4-12 Temperature Coefficient 2-2 Timed Out Commands 4-21

Unpacking 3-1 Uses CalLowWeight 4-14

volatile memory 4-13

WAVERSAVER® 1-3, 2-1 Weighing System Test 1-4 Weighing System Tests 1-4 WEIGHSYSTEST 4-21 wrist-strap grounding device 3-1 Write Non-Volatile Command 5-7 Write Non-Volatile Command (WRITENONVOLATILE) 4-12, 4-13, 5-7

HI 1756-WS MANUAL

Write Parameters (WRITEPARAM) 4-18

Zero Command (ZEROCMD) 4-12

Glossary of Terms

GLOSSARY OF TERMS

ACCURACY Closeness of a reading to the actual value of the quan-

tity being measured.

ALARM Indication of a tolerance deviation. APPURTENANCE Any added equipment other than the weigh vessel,

platform scale or feeder. Pipes, Valves etc.

AUTO ZERO TOLERANCES

BAUD RATE Baud rates are used as a measure of how fast serial

BI-DIRECTIONAL A capability used to transmit data in either direction at

CAL DAY Day of the last calibration (if entered). CAL ID Operator ID or in it ials of t he p ers on d oing t h e calib ra-

CAL LO WEIGHT Amount of test weight used (normally zero) for the

CAL MONTH Month of the last calibration (if entered). CAL TYPE Type of calibration last performed.

Automatic version of Zero Tolerance which is the limit for enabling the module to zero off the weight automatically. This is not used unless you have the Zero Track Enable bit set to on. If used, Gross weight will zero whever gross weight is within the auto zero tolerance and the scale is not in motion.

data is transmitted. (BIT/SEC). The higher the num ber the faster the data is sent between 2 devices.

the same time, for example: to or from the instrument.

tion (if entered).

low point during hard calibration or reference point during C2 calibration.

CAL YEAR Year of the last calibration (if entered). CHANNEL Designates the channel the command is bei ng run on.

Single channel modules channel is always 0. Dual channel modules, the first channel is alwa ys 0 and the second channel is always 1.

HI 1756-WS MANUAL

CHANNEL ACTIVE A parameter that turn s the channel off/on. If channel

is set to 0 it is off or inactive. If channel is set to 1 it is on or active.

COMMAND A request made by the host computer (PLC) to per-

form an Action. This consists of either number or letter command designators.

CAPACITY The maximum weight that can be placed on a scale or

balance.

CHECK WEIGHING Comparing a weight against limits to determine if the

weight is within preset limits.

CLEAR KEY A key used to clear data or formats entered into a

menu.

DEAD BAND A value used to prevent relay chatter once the setpoint

is reached.

DEAD LOAD Weight of hopper assembly or platform assembly sit-

ting on top of load cells.

DECIMAL POINT POSITION

DISPENSER Dispensing is a Loss-in-Weight process. The Dis-

DISPLAY A device used to show information from the instru-

ENGINEERING UNITS Pounds (lbs), Kilograms (kg), ounces (oz, grams (g)

ELECTROSTATIC DISCHARGE

Menu item used to set the decimal point position for all display readouts.

penser measures the weight loss out of a vessel until a pre-configured weight set point has been reached

ment.

Electrostatic Discharge is an electric charge (static electricity) which occurs when an electrically charged object such as a person, touches an HI 3000 Series Instrument. to avoid damage to personnel and to the unit, a grounded static control wrist strap should always be worn when opening and/or servicing an instrument.

Glossary of Terms

E-MAIL Short for electronic mail, the transmission of mes-

sages over communications networks.

ENTER KEY This key is used to accept user input into the memory.

EPROM Electrically Programmable Read-only Memory.

ERROR A message that indicates an unacceptable input has

been entered.

EVEN A parity configuration.

EXCITATION DC voltage supplied to the load cell for power.

FILLER Filling is a Gain-in-Weight process. Th e Filler mea-

sures the weight gain into a vessel until a pre-configured weight set point has been reached.

FULL-SCALE Full scale input as defined by instrument and load cell

parameters. Example: 3mV/V load cell @ 10 volts = 30mV full scale.

GRADUATION SIZE Minimum increment disp layed by the instrument

GROSS WEIGHT An overall weight exclusive of tare deductions.

Weight of material plus container.

IBC Intermediate Bulk Container

INTERNET The Internet is a system of linked networks that are

worldwide in scope and facilitate data communication services such as remote login, file transfer, electronic mail, the World Wide Web and newsgroups.

INTRANET An intranet is a private network utilizing Internet-type

tools, but available only within that organization.

KILOGRAMS A unit of mass in the metric system. Equal to 1000

grams or 2.2046 pounds. “kg” represents kilograms on the display.

LEVELLING The procedure that sets the scale so that a scale plat-

form is exactly horizontal (level).

HI 1756-WS MANUAL

LED Light Emitting Diode. these are used as status indica-

tors.

LOAD CELL A device which produces output signal proportional

to the applied weight or force. Also called a strain gauge.

MENU A set of prompts used to configure the instruments.

MENU DRIVEN Operational prompts suppled in common language via

the system display to guide an operator through a pro cedure.

METRIC Unit of measure selection for weight readings, either

lbs or kgs. Set 0 for lbs, 1 for kgs.

MICROPROCESSOR A semiconductor device that performs control, input/

output, arithmetic and logical op erations by ex ecuting instructions obtained from memory sources.

MIDPOINT LINEARITY CORRECTION

MOTION The amount of allowable deviation between consecu-

MOTION TOLERANCE Weight parameter setting required to indicate the

NEMA 4 An enclosure that is water tight, dust tight and usable

Allows operator to “BEND” the response of an instrument to match a non-linear input.

tive readings before a weighment is accepted as being complete.

weight is changing on the scale and the scale is in motion. The module takes the current reading and compares this reading with the reading taken a second earlier. If the difference is greater thatn the Motion Tolerance setting, the module indicates that the scale is in motion. The motion tolerance setting should be set so that it is greater than any fluctuation seen on the scale with no weight changing bu t low enou gh to indi cate motion with the slowest actual increase or decrease of product weight on the scale. Use to get an indication when product is still flowing to prevent redings before a process is done.

bother indoors and outdoors. W ill protect the enclosed

Glossary of Terms

equipment against spalshing water, seepage of water, falling or hose-directed water and severe external condensation.

NEMA 4X An enclosure that is water tight, dust tight and usable

both in doors and outdoors. Will protect the enclosed equipment against splashing water, seepage of water, falling or hose directed water and severe external con densation. Corrosion Resistant.

NODE A node is an active device connected to the network,

such as an HI 3000 Instrument, computer or a printer. A node can also be a piece of networking equipment such as a hub, switch or a router.

NET WEIGHT Gross Weight minus the Tare Value.

NON-LINEARITY A deviation of an instrument response from a straight

line.

NUMBER OF READINGS PER AVERAGE

ODD A parity configuration.

OPTION A device not supplied with a standard instrument.

OPTION SLOT A location used to install an option card.

PARITY A binary digit error cor rection appended to an arra y of

POUNDS A unit of mass in the Avoirdupois System. Equal to 16

POP Short for Post Office Protocol, a protocol used to

The number of weight readings used to compute the displayed weight.

bits to make the sum of all the bits always odd or always even. The quality of being either odd or even. The fact that all numbers have a parity is commonly used in data communications to ensure the validity of data.

ounces or 0.4536 kilograms.

retrieve e-mail from a mail server.

HI 1756-WS MANUAL

PREACT The number of units above or below the set point

value of which the relay will trip. Use as an “in flight” compensation value.

PREVIOUS KEY A key used to step back through menus.

PROMPTS Instructions or options presented in a menu by the

instrument.

PROTOCOL Network protocols are stand ards that allow computers

to communicate. A protocol defines how computers identify one another on a network, the form that the data should take in transit, and how this information is processed once it reaches its final destination.

RAM Random-Access-Memory. Read/write memory out of

which the microprocessor can both write and read data.

RATE OF CHANGE (ROC)

REPEATABILITY The maximum difference between readings for

RESOLUTION Resolution is the value of the fine st division of the

ROM Read-Only-Memory. This permanent, non-volatile

RTS Request to sen d an RS-232C leve l , signaling a readi-

RXD Received data at a serial port. Accepts RS-232C data

SCALE CAPACITY The maximum amount of weight the scale is capable

A measure of the rate at which weight is changing. For exampl e: If 100 pound s were dispensed in 1 min ute, the rate of change (ROC) would be 100 lb/minute.

repeated readings under identical conditions. (Also called reproducibility)

scale.

memory gives the processor instructions and cannot be altered.

ness to send.

signals.

of supporting. (Live load plus dead load).

Glossary of Terms

SECURE MEMORY MODULE (SMM)

SET POINT Ordered weight of a particular ingredient. Weight

SPAN WEIGHT the total amount of test weights used (placed on the

STATUS The return staus when running a command. TAG Another name for the Secure Memory Module TARE Artificial zeroing of the weight hopper so that a net

The Secure Memory Module stores and protects vital information from corruption. The SMM also allows the transference of data from one instrument to another with no re-calibration ore re-configuration necessary.

reading at which a relay will be actuated.

scale) for the high point when performing a “Tradi tional Calibration”.

weight can be displayed. The action of adjusting out the known weight of the container from the total indi cated weight, so that the indicator reads net weight directly. For example if you put a pallet on a scale and “tare” out the weight of the pallet you are weigh ing at zero. The tare weight is the weight of the pallet. Scale will not tare if scale is in motion.

TEMPERATURE COEFFICIENT

TIME BASE Time in seconds between values subtracted to deter-

TOKEN In programming languages, a single element of a pro-

TRANSMITTER SPAN Value the transmitter puts o ut with the maximum

the change in indication due solely to a change in temperature from a reference temperature. Expr essed as a percentage of span value for a specified temperature change.

mine rate-of-change.

gramming language. For example, a token could be a keyword, an operator, or a punctuation mark. Used to format E-mails or to enter parameters into an Custom E-mail.

weight on the load cell.

HI 1756-WS MANUAL

TRANSMITTER ZERO Value the transmitter puts out with the minimum

weight on the load cell.

TTL Transistor-Transistor Logic

TXD Transmit Data

UPDATE RATE Number of times per second a new weight reading is

taken.

WAVERSAVER

Setting to remove the effects of ambient vibration from interfering with a weight reading. The range of settings is to eliminate vibration at various frequen

cies.

ZERO Weight reading once the dead load has been offset.

ZERO CALIBRATION Offset of the value of the dead load of the weight hop-

per.

ZERO TOLERANCE The number of graduations from zero that will be

accepted as zero by the instrument.

ZERO TRACK ENABLE

A bit that is set to allow the module to zero out any accumulated product on the scale up to the Auto Zero Tolerance setting without operator intervention.

Hardy HI 1756-2WS User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual

HI 1756-WS & HI 1756 -2WS

WEIGH SCALE MODULE

Series A

Local Field Service

Outside the U.S

Table of Contents

Table of Illustrations

CHAPTER 1 - OVERVIEW

About This Manual Chapter 1 - Introduces the instruments and provides

Description Both the HI 1756-WS and HI 1756-2 WS Weigh Scale

Excitation Monitor Continuously monitors a system’s excitation current

AUTO ZERO TRACKING

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,

Non-Linearity 0.0015% of Full Scale

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

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

Temperature Coefficient

Operating Temperature Range

Storage Temperature Range

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

Digital Voltmeter Accuracy +/- 2% of full scale

Optional Equipment

1756 RTA (Remote Termination Assembly

RTA Cable Assemblies

HI 215IT Series Junction Box

Default Parameters

CHAPTER 3 - INSTALLATION

A Brief Description of Chapter 3

Unpacking Step 1. Before signing the packing slip, inspect

Removing the Module from the Chassis

Installing the Module I/ O Connector

About the Module I/O Connector

Load Cell Wiring Diagrams

Industry Standard Load Cells

Hardy Load Sensor with C2

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

RTA Cable Assembly

CHAPTER 4 - SETUP

A Brief Description of Chapter 4

Power Check Step 1. To make or change settings, there must be

LEDS

Scale Data LEDs

OK Module Status LED

Reset Module Message

Setting Up Communications Between the PLC and the HI 1756- WS (-2W S) Weigh Scale Module

Configuration Parameters for the HI 1765-WS Module

Input Data This is discrete input data which is a module-defined

STATUSWORD The module returns a binary statusword where each

Parameters for the HI 1756-WS (-2WS) Module

Commands Commands are configured in the RSLOGIX 5000 as

Zero Command (ZEROCMD)

Tare Command (TARECMD)

Enable Calibration Button Command (ENABLEBUTTON CMD)

Disable Calibration Button Command (DISABLEBUTTON CMD)

Set Default Parameters (SETDEFAULTPAR AMS)

Cal Low Command (CALLOWCMD)

Cal High Command (CALHIGHCMD)

C2 Cal Command (C2CALCMD)

Perform Integrated Technician Tests (WEIGHSYSTEST)

Structure (ITECHTEST)

Search for C2 Load Sensors (C2SEARCH)

Read C2 Sensor Serial Number (READC2SERIALN UM)

Read Status of Module (GETSTATUS)

Write Parameters (WRITEPARAM)