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Encoder and Sensor
Compatibility
1756-HSC Module Features
The most common applications that use the ControlLogix
module also use these Allen-Bradley
•
Allen-Bradley 845 incremental encoder
•
Allen-Bradley Bulletin 872 three-wire DC proximity sensor
•
PHOTOSWITCH
Additional encoders and sensors can be connected to and used with the
module. For specific compatibility of other encoder and sensor compatibility,
check the user publications for each product or consult your local Allen-
Bradley representative.
The table shows the type of encoder or sensor that you can choose for your
module.
Pulse Width, Min
Proximity
500 ns
Quad Encoder
2 s
This table highlights features of the module.
Feature
Real-time manipulation of preset/
rollover tag settings
Period rate / Continuous Rate
frequencies
Module-specific tags
Additional I/O Module Features
This table lists additional features for ControlLogix® I/O modules, including
the 1756-HSC module.
Feature
Configuration software
Module fault reporting
Status indicators
Rockwell Automation Publication 1756-UM007E-EN-P - August 2021
®
products:
®
series 10,000 photoelectric sensor
Frequency Range
1 MHz
250 kHz
Description
Preset and Rollover tags, which provide a reference point to start the count and
reset the count to zero, respectively, are included in the Configuration tags at
the initial system configuration. The module also has both tags in the Output tag
settings to allow the values to be changed in real time when the 1756-HSC Data-
extended Comm Format is selected. This feature provides the flexibility of
changing counter settings 'on-the-fly' without having to reconfigure all system
tags.
Both Frequency modes are available with the 1756-HSC module when using the
Data-extended Comm Format. Period Rate mode counts internal 4 MHz clock
pulses over a used-defined time frame to determine frequency. Continuous
Rate mode is similar to Period Rate mode except dynamic outputs can be
turned On /Off at pre-determined pulse intervals.
Tags are automatically created when you add a 1756-HSC module to your
controller project. The module has descriptive tags for using pulse and
frequency values, such as Present Value, Stored Value, and Totalizer.
Description
The programming software has a custom interface to configure your module. All
module features can be enabled and disabled through the software.
I/O modules provide both hardware and software indications when a module
fault occurs. Status indicators signal fault conditions. The programming
software describes the fault message so you know what action to take to
resume normal operation.
Status indicators on the front of the module report the operational status of the
module. The input-point status display indicates a particular point's status,
including specifics for the input A, B, and Z (reset) points for each channel of the
module. The output-point status display indicates the status of four output
points on the module.
Chapter 1
Module Features
®
high-speed counter
Leakage Current
250 A @ 5V DC
250 A @ 5V DC
11
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