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Count Pulse
(Input A)
Direction Control
(Input B)
Present Count
1
Rockwell Automation Publication 2080-UM004D-EN-E - March 2018
Pulse External Direction Counting
Incrementing Encoder or Sensor
Sensor or Switch
2
3
A
B
0 (Open or No Connection)
1
1
X (don't care)
0
X (don't care)
Two input counter (Up/Down Pulses)
Pulses on A causes the counter to increment. Pulses on B causes the counter to
decrement. Pulses may occur at any time. Note that pulses can occur very closely
(that is, much faster than plug-in scan time) that the plug-in never notices the
change in count. In such cases, both counts may be ignored (the net change being
zero anyway). In no case shall a pulse be lost. See the following diagram.
High Speed Counter – 2080-MOT-HSC
Count pulse
Direction control
1
0
2
INPUT A
INPUT B
INPUT Z
1
2
Change in Count Value
+1
-1
0
0
Chapter 4
29
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