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Introduction
Counter/Encoder Overview
Counter Modes
This chapter describes the Counter modes for the 1756-HSC module.
Topics include:
•
types of counting: counter and encoder.
•
means of storing the counts.
•
modes for manipulating the count.
•
tags for control of onboard outputs.
There are three Counter modes that can be selected from the Operational
Mode pull-down menu on the Counter Configuration tab. See
configuration details.
The choices are:
•
Counter mode (default).
•
Encoder x1 mode.
•
Encoder x4 mode.
The Encoder and Counter modes are virtually identical; the only difference is
the method that is used to count. There are two counters (using input A and B)
per module. Input Z, which is described in more detail later in this chapter,
basically affects how the counts are stored based on the selected Storage mode.
In Counter mode, the module reads incoming pulses from input A only and
stores the accumulated count value in the Present Value tag. The state of
input B determines whether to increment or decrement the count based on
whether it's low, floating (count up) or high (count down).
Rockwell Automation Publication 1756-UM007E-EN-P - August 2021
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