The Helman Group HM1525 User Manual
Helm Instrument Company, Inc.
361 West Dussel Drive
Maumee, Ohio 43537 USA
419/ 893-4356
Fax: 419/ 893-1371
www.helminstrument.com
1769 Weigh Scale
Module
Model HM1525
Instruction Manual
FEBRUARY 2004
Solid state equipment has operational characteristics differing from those
Important User
Information
of electromechanical equipment. “Safety Guidelines for the Application,
Installation and Maintenance of Solid State Controls” (Allen-Bradley
Publication SGI-1.1) describes some important differences between solid
state equipment and hard-wired electromechanical devices. Because of
this difference, and also because of the wide variety of uses for solid
state equipment, all persons responsible for applying this equipment
must satisfy themselves that each intended application of this equipment
is acceptable.
In no event will the Allen-Bradley Company or Helm Instrument
Company be responsible or liable for indirect or consequential damages
resulting from the use or application of this equipment.
The examples and diagrams in this manual are included solely for
illustrative purposes. Because of the many variables and requirements
associated with any particular installation, the Allen-Bradley Company or
Helm Instrument Company cannot assume responsibility or liability for
actual use based on the examples and diagrams.
No patent liability is assumed by Allen-Bradley Company or Helm
Instrument Company with respect to use of information, circuits,
equipment, or software described in this manual.
Reproduction of the contents of this manual, in whole or in part, without
written permission of the Allen-Bradley Company and Helm Instrument
Company is prohibited.
Throughout this manual we use note to make you aware of safety
considerations.
ATTENTION: Identifies information about practices or
circumstances that can lead to property damage.
Identifies information that is especially important for
successful application and understanding of the product.
Attentions help you:
• identify a hazard
• avoid the hazard
• recognize the consequences
ATTENTION: Please check power supply ratings
before proceeding! Each tonnage module
consumes (+24, 50mA +5, 66mA). Be sure to not
overload the power supply.
PLC, PLC2, PLC3, and PLC5 are registered trademarks of the Allen-Bradley Company, Inc.
SLC, SLC500, PanelView, RediPANEL, Dataliner are trademarks of Allen-Bradley Company, Inc.
IBM is a registered trademark of International Business Machines, Incorporated.
Weigh Scale is a registered trademark of the Helm Instrument Company, Inc.
Table of
Contents
Strain Gage
Table of Contents
Weigh Scale Load Module
User Manual
Preface...................................................................... P-1
Who Should Use this Manual................................P-1
Purpose of this Manual.........................................P-1
Contents of this Manual........................................P-2
Related Documentation ........................................P-3
Terms and Abbreviations......................................P-4
Common Techniques Used in this Manual...........P-5
Product Support....................................................P-5
Your Questions or Comments on this Manual......P-5
Overview
Getting
Started
Channel
Configuration,
Data and
Status
Chapter 1..................................................................1-1
Components..........................................................1-1
Strain Gain Transducer Operation........................1-1
Hardware Overview ..............................................1-2
Chapter 2..................................................................2-1
Getting Started......................................................2-1
Required Tools and Equipment ............................2-1
System Operation.................................................2-2
Sensor Wiring .......................................................2-2
Chapter 3..................................................................3-1
Channel Configuration, Data and Status ..............3-1
Module Addressing...............................................3-1
Module Configuration.........................................3-1
Data Table Memory Map ......................................3-1
Output Image........................................................3-1
Input Image...........................................................3-3
Integer File............................................................3-5
Initial
Setup
Procedures
System
TroubleShooting
Guide
Table of Contents
Weigh Scale Load Module
User Manual
Chapter 4..................................................................4-1
Initial Setup Procedures........................................4-1
Step 1. Balance Sensor Input...............................4-1
Step 2. Set Calibration Numbers ..........................4-2
Chapter 5..................................................................5-1
HT-400 Sensor Ohm Reading ..............................5-1
Block Diagrams.....................................................5-2
Trim Jumper Setting..............................................5-2
PLC Ladder Logic.................................................5-3
Preface
Preface
Read this preface to familiarize yourself with the rest of this manual. This
preface covers the following topics:
• who should use this manual
• the purpose of this manual
• terms and abbreviations
• conventions used in this manual
• Allen-Bradley support
Who Should
Use this
Manual
Purpose of
This Manual
Use this manual if you are responsible for the design, installation, programming,
or maintenance of an automation control system that used Allen-Bradley small
logic controllers.
You should have a basic understanding of SLC 500 products. You should
understand electronic process control and be able to interpret the ladder logic
instructions required to generate the electronic signals that control your
application. If you do not, contact your local Allen-Bradley representative for the
proper training before using this product.
This manual is a learning and reference guide for the Helm Weigh Scale Module.
It contains the information you need to install, wire, and use the module.
P-1
Preface
Contents of this
Manual
Chapter Title Content
Preface
1 Overview
2 Installation and Wiring
3 Channel Configuration, Data
and
Status
4 Ladder Programming Examples
5 Troubleshooting
Describes the purpose, background,
and scope of this manual. Also
specifies the audience for whom this
manual is intended and defines key
terms and abbreviations used
throughout this book.
Provides a hardware and system
overview. Explains and illustrates the
components of the system.
Provides installation information and
wiring guidelines.
Examines the channel configuration
and the channel status word, and
explains how the module uses
configuration data and generates
status during operation.
Gives an example of the ladder logic
required to define the channel for
operation. Also includes
representative examples for unique
requirements such as sample count,
trend calculation, etc.
Explains how to interpret and correct
problems that occur while using the
load module.
A Specifications
B Ladder Program
P-2
Provides physical, electrical,
Environmental, and functional
Specifications for the module.
Preface
Related
Documentation
The following documents contain information that may be helpful to you as you use Allen-Bradley SLC
products. To obtain a copy of any of the Allen-Bradley documents listed, contact your local Allen-Bradley
office or distributor.
For Read this Document Document
Number
An overview for the MicroLogixTM
Programmable Controllers
A description on how to install and use your
MicroLogix Programmable Controller
A description on how to install the processor
into the MicroLogix 1500 Base unit.
Selecting Discrete Input/Output Modules Compact Discrete Input/Output Modules
View power usage of expansion modules to
determine power supply requirements
End Cap Installation Compact I/O End Caps/Terminators
A complete listing of current Automation
Group documentation, including ordering
instructions. Also indicates whether the
documents are available on CD-ROM or in
multi-languages
A glossary of industrial automation terms
and abbreviations
MicroLogix 1500 Programmable Controllers 1764-UM001A-US-P
MicroLogix 1500 Programmable Controller
Base Units Installation Instructions and
Wiring Diagrams
MicroLogix 1500 Processor Installation
Instructions
Technical Data
Expansion Modules System Qualifier RA Website Download
Installation Instructions
Automation Group Publication Index SD499
Allen-Bradley Industrial Automation
Glossary
1764-IN001A-ML-P
1764-IN002A-ML-P
1769-2.1
1769-5.16
ICCG-7.1
An article on wire sizes and types for
grounding electrical equipment
P-3
National Electrical Code Published by the
National Fire
Protection
Association of
Boston, MA.
Preface
Terms and
Abbreviations
The following terms and abbreviations are used throughout this manual. For definitions of terms
not listed here refer to Allen-Bradley’s Industrial Automation Glossary, Publication ICCG-7.1.
Calibration - Procedure, performed by trained personnel, where machine or press is
dynamically loaded to impact on load cells. A process of linearity measuring to determine the
loading capacity of the machine.
Calibration Number - Amplification values established during machine calibration or preassigned on force load cells.
Channel - Refers to one of two, strain gage inputs available on the modules terminal block.
Chassis - A hardware assembly that houses devices such as I/O modules, adapter modules,
processor modules, and power supplies.
Configuration Word - Contains the channel configuration information needed by the module to
configure and operate each channel. Information is written to the configuration word through
the logic supplied in your ladder program.
Data Word - A 16-bit integer that represent the value of the analog input channel. The channel
data word is valid only when the channel is enabled.
Gain - Amplification of an input signal.
Load/Force - Measurement of impact during a machine cycle. Sensors provide the input for
this measurement.
LSB - (Least Significant Bit) Refers to a data increment defined as the full scale range divided
by the resolution. The bit that represents the smallest value within a string of bits.
Remote Configuration - A control system where the chassis can be located several thousand
feet from the processor chassis.
Resolution - The smallest detectable change in a measurement, typically expressed in
engineering units (e.g. 0.15C) or as a number of bits. For example a 12-bit system has 4,096
possible output states. It can therefore measure 1 part in 4096.
Sample - Load/force values established from a series of machine cycles. Also defined as
benchmark.
Sampling time - The time required by the A/D converter to sample an input channel.
Scale - Value used to describe the press/machine overall tonnage. Set for maximum value of
one channel. For example, settings for a 150 ton press = 75.
Status Word - Contains status information about the channel’s current configuration and
operational state. You can use this information in your ladder program to determine whether
the channel data word is valid.
Update Time - The time required for the module to sample and convert the input signals of all
enables input channels and make the resulting data values available to the SLC processor.
P-4
Common
Techniques
Used in this
Manual
Product
Support
The following conventions are used throughout this manual:
• Bulleted lists such as this one provide information, not procedural steps.
• Numbered lists provide sequential steps or hierarchical information.
Contact your Helm representative or call Helm direct at 419-893-4356:
• sales and order support
• product technical training
• warranty support
• support service agreements
Preface
Your Questions or Comments on this Manual
If you have any suggestions for how this manual could be made more useful to you, please send
us your ideas.
P-5
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