1769 Weigh Scale
Module
Helm Instrument Company, Inc.
361 West Dussel Drive
Maumee, Ohio 43537 USA
419/ 893-4356
Fax: 419/ 893-1371
www.helminstrument.com
Model HM1525
10/05/2018
Instruction Manual
October, 2018
HM1525 Weigh Scale Module
Important User
Information
Solid state equipment has operational characteristics differing from those
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.
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HM1525 Weigh Scale Module
Purpose of
This Manual
Who Should
Use this
Manual
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
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 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.
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HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
OUTPUT TAG DESCRIPTIONS
CALMODE
Used for initial installation. All math is disabled, weigh value is not scaled, leaving raw A/D value.
WEIGH MODE
Factory cal setting 100,000 counts = 2MV/V
CLEAR TARE CH1/CH2 Bit
Clears internal tare value for “zero state”.
Useful when troubleshooting load cell wiring or other failures.
TARE CH1/CH2
Sets A/D value to zero.
READ ADTRIM BIT
(HELM Factory setting only).
CH1/CH2 AUTO TUNE BITS
Set to “1” when in auto cal mode
Reference/cal weight on before setting bit
READ SCALE SET BIT
Set to “1” to verify CH1/CH2 scale sets
ENABLE FILTER BITS
Set to “1” to enable 60/50 h2 filter
CH1/CH2 FILTER ON BIT
Set to “1” to enable filter
Set to “0” to disable filter
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HM1525 Weigh Scale Module
OUTPUT TAG DESCRIPTIONS
MSF BITS – (Motion Stabilization Filter)
Used for applications with constant or static type loads to keep display value stable.
MSF1_2 (1 count up – 2 counts down).
MSF2_4
MSF4_8
MSF5_10
Set one bit only.
ZERO-DEAD-BAND BITS
Useful for Auto-Tare functions with production runs.
Set only one bit.
ZEROBAND_025 = .025% full scale
ZEROBAND_05 = .05% full scale
ZEROBAND_075 = .075% full scale
Auto tare occurs when load cell weight is at bit level or lower.
READ MV/V BIT
Check verify mV/V settings
READ CAL FACTOR BIT
Check auto cal values
SAVE TO EEPROM
Stores CH1/CH2 scale settings
AUTO CAL MODE
Set to “1” for auto cal mode
SET CH1 SCALE BIT
Set to “1” to set CH1 scale
SET CH2 SCALE BIT
Set to “1” to set CH2 scale
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HM1525 Weigh Scale Module
REQUIRED CONTROLLER TAGS
CH1/CH2 SCALE SET AND AUTOCAL REFERANCE
CH1_SCALE_MOD1
Full scale setting for CH1, CH2
Value is determined by capacity of load cell and by resolution required.
Example: 10KG = 10,000
GET WEIGH VALUE CH1
CH1_WEIGHT_MOD1
CH2_WEIGHT_MOD1
Reports measured weigh value in RUN mode.
Reports raw A/D count value in CAL mode.
SET AVERAGE SAMPLE COUNT
SMAPLE_SET_MOD1
Set number of samples to take for average type filter.
SET mV/V CH1, CH2
CH1_MV_V MOD1
CH2_MV_V MOD1
CH1/CH2 MV_V Settings
Enter 2000 for 2.0 mV/V
Actual value is from load cell specification.
FILTER TIME _MOD1
FILTER_TIME_MOD1
Each count = 1 msec
50 h2: 20 msec = 20
60 h2: 16 msec = 16
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HM1525 Weigh Scale Module
Specifications - HM1734-WM Strain Gage Input Module
Module Location 1734-TOP (screw terminal) or 1734-TOPS (spring loaded terminal)
Type of input Strain Gage (350 ohm, 700 ohm)
Gage Excitation Voltage 5 Volt
Input Impedance 5.11 meg. ohm
Display Resolution Up to .0025% of full scale
Module Accuracy Dependent on Load Cell Specification
Module Update Time Software selectable from 2ms to 100ms
Number of Channels 2 (isolated)
A/D Conversion Method Successive Approximation - 24 bit
Normal Mode Rejection:
(between +/- input) 116DB CMRR
Amplifier Bandwidth 200 kHz
Calibration Software Selectable
Isolation: 500 VDC continuous between inputs
and chassis ground, and between input
and backplane
LED indicators 2 LED's for Power and Alarm
Recommended Cable Strain Gage Cable (Helm part number 6117)
Operating Temperatures 0°C to 60°C (32°F to 140°F)
Emissions CISPR 11
Group 1, Class A
Pointbus Current 5V @ 72ma
External Power 24V @ 19.5ma
Dimensions 2.21H x 0.47W x 2.97L (Millimeters 56H x 12W x 75.5L)
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HM1525 Weigh Scale Module
AUTO-CAL PROCEDURE
1) Set known weight for channel at scale parameter.
2) Tare-0 (with no weight on cell/scale).
3) Apply known load (test weight) to load cells/ scale.
4) Set AUTOCAL bit on for CH1 (CH2 if applicable).
5) Turn bit off before removing known weight.
6) To ensure accuracy, repeat the steps above.
7) Toggle “save to eeprom” bit
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HM1525 Weigh Scale Module
SETTING UP HM1525WM MODULE
Step #1
Add module to project as following:
HM1525WM MODULE PROPERTIES
General Tab Settings
Connection Tab Settings
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HM1525 Weigh Scale Module
Step #2
Open “Template” file
Copy all controller tags
Open project file
Paste controller tags
Duplicates may be created, delete them now
Step #3
Open “Template” file
Copy add-on instruction “HM1525WM”
Open project file
Paste add-on instruction in add-on’s section
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HM1525 Weigh Scale Module
Step #4
Open “Template” file
Copy weightmodule1
Open project
Paste weighmodule1
Check program tag here should be as
Example
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HM1525 Weigh Scale Module
Step #5
Check routine for entries
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HM1525 Weigh Scale Module
Description
Output_bits_mod1.0
bit
Set Cal Mode Bit
Output_bits_mod1.1
bit
Set Run Mode Bit
Output_bits_mod1.2
bit
Ch1 Clear Tare Bit (momentary)
Output_bits_mod1.3
bit
Ch1 Tare Bit (momentary)
Output_bits_mod1.4
bit
Ch2 Clear Tare
Output_bits_mod1.5
bit
Ch2 Tare
Output_bits_mod1.6
bit
Read mV/V sets
Output_bits_mod1.7
bit
Read cal factor
Output_bits_mod1.8
bit
Save to eeprom
Output_bits_mod1.9
bit
Read adtrim
Output_bits_mod1.10
bit
Auto cal mode
Output_bits_mod1.11
bit
Set Ch1 scale
Output_bits_mod1.12
bit
Set Ch2 scale
Output_bits_mod1.13
bit
Ch1 auto-tune
Output_bits_mod1.14
bit
Ch2 auto-tune
Output_bits_mod1.15
bit
Read scale sets
Parameter_bits_mod1.0
BOOL
Msf 1-2
Parameter _bits_mod1.1
BOOL
Msf 2-4
Parameter _bits_mod1.2
BOOL
Msf 4-8
Parameter _bits_mod1.3
BOOL
Msf 5-10
Parameter _bits_mod1.4
BOOL
Msf 6-12
Parameter _bits_mod1.5
BOOL
Msf 7-13
Parameter _bits_mod1.6
BOOL
Msf 8-14
Parameter _bits_mod1.7
BOOL
Reserved
Parameter _bits_mod1.8
BOOL
Zero band 25
Parameter _bits_mod1.9
BOOL
Zero band 50
Parameter _bits_mod1.10
BOOL
Zero band 75
Parameter _bits_mod1.11
BOOL
Enable filter
Parameter _bits_mod1.12
BOOL
Ch1 filter on
Parameter _bits_mod1.13
BOOL
Reserved
Parameter _bits_mod1.14
BOOL
Reserved
Parameter _bits_mod1.15
BOOL
Ch2 filter on
Data Map for HM1734-WM on Ethernet/IP
OUTPUT TAGS
Data Map for HM1734-WM on Ethernet/IP
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Data Tags Name
Data Type
Ch1_mv_v_mod1
INT
Ch1_scale_mod1
DINT
Ch1_weigh_mod1
DINT
Ch2_mv_v_mod1
INT
Ch2_scale_mod1
DINT
Ch2_weight_mod1
DINT
Filter_time_mod1
INT
Mode_set_bits_mod1
INT
Parameter_bits_mod1
INT
Sample_set_mod1
INT
Required Controller Tags
HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
For
Read this Document
Document
Number
CompactLogix 5370 L1 Programmable
Automation Controllers
CompactLogix 5370 L1 Programmable
Automation Controllers
1769-PP012
An overview for the MicroLogixTM
Programmable Controllers
MicroLogix 1500 Programmable Controllers
1764-UM001A-US-P
A description on how to install and use your
MicroLogix Programmable Controller
MicroLogix 1500 Programmable Controller
Base Units Installation Instructions and
Wiring Diagrams
1764-IN001A-ML-P
A description on how to install the processor
into the MicroLogix 1500 Base unit.
MicroLogix 1500 Processor Installation
Instructions
1764-IN002A-ML-P
Selecting Discrete Input/Output Modules
Compact Discrete Input/Output Modules
Technical Data
1769-2.1
View power usage of expansion modules to
determine power supply requirements
Expansion Modules System Qualifier
RA Website Download
End Cap Installation
Compact I/O End Caps/Terminators
Installation Instructions
1769-5.16
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
Automation Group Publication Index
SD499
A glossary of industrial automation terms
and abbreviations
Allen-Bradley Industrial Automation
Glossary
ICCG-7.1
An article on wire sizes and types for
grounding electrical equipment
National Electrical Code
Published by the
National Fire
Protection
Association of
Boston, MA.
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.
Page 20
HM1525 Weigh Scale Module
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.
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Common
Techniques
Used in this
Manual
Product
Support
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.
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
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.
HM1525 Weigh Scale Module
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HM1525 Weigh Scale Module
Overview
Components
You have just purchased the most advanced load monitoring solution
available. HELM INSTRUMENT COMPANY, INC. manufactures a
complete line of load monitoring control solutions for use on metal
stamping, forging, compaction and assembly presses; cold forming, cold
heating, injection molding and die cast machines.
Standard or custom transducers and load cells are available for in-die
monitoring of transfer or progressive tooling.
At HELM, quality is inherent not only in the design of our products but in
the attitudes of our employees as well. We’re working together to give
you the best. After all, that’s what our business is all about - providing
innovative instrumentation to help make your manufacturing process
more productive and your operation more effective.
The Helm Weigh Scale combines machine and tooling monitoring with
programmable limit switch function. User programmable high and low
limits protect the machine and tooling to ensure part quality.
Critical setup information can be stored and uploaded as part of a die
recipe program. An optional resolver input module is used to compare
machine/press tonnage to crank angle for real time signature analysis.
The Helm Weigh Scale module is attached to the controller or to an
adjacent I/O module on the din rail. The system is comprised of two
parts; the input module and strain gage based sensors and load cells.
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HM1525 Weigh Scale Module
Hardware
Overview
The Weigh Scale module can be attached to the controller or to an
adjacent I/O module before or after din rail mounting. It is a Class 1
module (uses eight input words and eight output words). It interfaces to
strain gage based transducers (350ohm or 700ohm).
The module can accept input from two sensors. The module has no
output channels. Module configuration requires manual and user
programmable setup.
The Weigh Scale module receives and stores digitally converted analog
data into its image table for retrieval by processor. The module supports
connections from any combination of up to two strain gage sensors.
Any combination of Helm Strain Gage sensors can be used. Contact
Helm for additional information on the type and application of different
sensor options.
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HM1525 Weigh Scale Module
Getting
Started
This chapter can help you to get started using the Helm Weigh Scale
module. The procedures included here assume that you have a basic
understanding of PLC 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.
Because it is a start-up guide, this chapter does not contain detailed
explanations about the procedures listed. It does, however, reference
other chapters in this book where you can get more information about
applying the procedures described in each step.
If you have any questions or are unfamiliar with the terms used or
concepts presented in the procedural steps, always read the referenced
chapters and other recommended documentation before trying to apply
the information.
This chapter will:
Tell you what equipment you need
Explain how to install and wire the module
Show you how to set channels for the sensor input
Required Tools and Equipment
Have the following tools and equipment ready:
Small blade screwdriver
Appropriate strain gage cable
Programming equipment
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HM1525 Weigh Scale Module
Sensor
Wiring
System
Operation
To ensure proper operation
and high immunity to
electrical noise, always use
Helm strain gage cable.
To limit noise, keep strain gage cable as far
away as possible from power and load lines.
The module can support up to
two sensor inputs.
DO NOT attempt to parallel
additional gages as you will
cause damage to the module
and void product warranty.
The Weigh Scale module communicates to the processor through the parallel backplane
interface and receives +5Vdc and +24Vdc power from the power supply through the backplane.
No external power supply is required. The MicroLogix and CompactLogix platforms can support
up to 8 I/O modules. You may install up to 3 Weigh Scale modules using the base power
supply. An additional power supply can be added to support more than 3 modules.
Each individual channel on the module can receive input signals from strain gage based
sensors. The module converts the analog values directly into digital values.
The sensors are wired to the modules using the rightmost bank of inputs.
The pin-out is shown below.
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HM1525 Weigh Scale Module
Setup
Procedure
A complete listing of a sample ladder logic program is included at the back of this manual.
Examples shown here are for reference.
All values are 0 (default) on initial start-up. This means that all alarms are
disabled. You must make the following adjustments for proper operation:
Balance sensor input(s)
Set Calibration numbers
Step 1. Balance Sensor Input.
1. Set to Cal Mode
2. Press Clear Tare for each channel
3. Check balance value, should be 131,000 counts
Step 2. Set Calibration Numbers
1. Set Scale to capacity of load cell
2. Set mV/V to load cell specification
3. Example:
100 ton load cell, 2.025 mV/V
For scale set, enter 100
For mV/V set, enter 2025
4. Push Set CH1, Set CH2 Scale
Push Save to eeprom
5. Set to Run Mode
HT-400 Sensor Ohm Readings:
Green-Black 350 ohms
Red-White 350 ohms
All other color combinations 266 ohms
All colors to Ground open
Shield to Ground open
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HM1525 Weigh Scale Module
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