Rockwell Automation 1756-HSC ControlLogix High Speed Counter Module - Manual (Page 13)

Rockwell Automation Publication 1756-UM007C-EN-P - November 2011
1756-HSC Module Features 13
Encoder and Sensor
Compatibility
The most common applications using the 1756-HSC module also use the
following Allen-Bradley products:
• Allen-Bradley 845 incremental encoder
• Allen-Bradley Bulletin 872 three-wire DC proximity sensor
• PHOTOSWITCH ® series 10,000 photoelectric sensor
Additional encoders and sensors may be connected to and used with the
ControlLogix 1756-HSC 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.
1756-HSC/B Module
Features
This table highlights features of the 1756-HSC/B module.
Pulse Width, Min Frequency Range Leakage Current
Proximity 500 ns 1 MHz 250
A @ 5V DC
Quad Encoder 2
s
250 kHz 250
A @ 5V DC
Feature Description
Real-time manipulation of preset/rollover
tag settings 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 1756-HSC/B
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 re-configure all system
tags.
Period rate / Continuous Rate frequencies Both Frequency modes are available with
the 1756-HSC/B 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.
Module-specific tags Tags are automatically created when you
add a 1756-HSC module to your Logix5000
project. The 1756-HSC module has very
descriptive tags for using pulse and
frequency values, such as Present Value,
Stored Value, and Totalizer.