Download 1746-6.5, High-Speed Counter Module User Manual

Module Operation
Up/Down Pulse Inputs
2–5
With this input type, the counter increments on the rising edge of
pulses applied to input A and decrements on the rising edge of pulses
applied to input B. If pulses are applied to inputs A and B
simultaneously, the pulse counter retains its previous value.
The counter can be reset as described in Counter Reset Control on
page 2–7.
Important: Specific wiring information is contained in chapter 3.
Input A
Increment pulse
(count up)
Input B
Incrementing encoder
or sensor
Input Z
Decrement pulse
(count down)
module
Decrementing encoder
or sensor
Increment pulse
Decrement pulse
Count
1
2
3
2
1
0
1
2
Publication 1746-6.5 – April 1996