Rockwell Automation 1746-HSCE,D17466.5 High-Speed Counter Module - Manual (Page 21)

Publication 1746-UM006B-EN-P - August 2005
Module Operation 2-3
Pulse and Direction Input In this configuration, count pulses are applied to input A. The counter
direction is controlled by either the Up/Down Count Direction bit, or
by an external signal applied to input B (depending on the selection
made in M0:e.1/9-11).
When Pulse and Direction with External Control is chosen, the B input
controls the direction (as illustrated below). If input B is low, the
counter increments on the rising edges of input A. If input B is high,
the counter decrements on the rising edges of input A.
IMPORTANT
Specific wiring information is contained in Chapter 3.
Direction control
Encoder
module
Count pulse
or sensor
Sensor or switch
Count pulse
1 2 3 2 1 0 1 2 Count
Direction control
Low = increment
High = decrement
Input A
Input B
Input Z