Omron CJ1M-CPU21, Operation Manual

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Built-in Inputs Section 6-1
Pulse Input Modes
Differential Phase Mode The differential phase mode uses two phase signals (phase A and phase B)
and increments/decrements the count according to the status of these two
signals.
Conditions for Incrementing/Decrementing the Count
Pulse + Direction Mode The pulse + direction mode uses a direction signal input and pulse signal
input. The count is incremented or decremented depending on the status (ON
or OFF) of the direction signal.
Control
method Target value comparison Up to 48 target values and corresponding interrupt task numbers can be regis-
tered.
Range comparison Up to 8 ranges can be registered, with a separate upper limit, lower limit, and
interrupt task number for each range.
Counter reset method Select one of the following methods in the PLC Setup.
•Phase-Z + Software reset
The counter is reset when the phase-Z input goes ON while the Reset Bit (see
below) is ON.
•Software reset
The counter is reset when the Reset Bit (see below) goes ON.
(Set the counter reset method in the PLC Setup.)
Reset Bits: The High-speed Counter 0 Reset Bit is A53100 and the High-speed
Counter 1 Reset Bit is A53101.
Note Operation can be set to stop or continue the comparison operation when
the high-speed counter is reset. (CJ1M CPU Unit Ver. 2.0 only)
Item Specification
11 12 11 10 10 9 9 8 8 8 7 7 7 6 6 6 5 5 5 4 4 4 3 3 3 2 2 2 1 1 0
Phase-A
Phase-B
Count
Phase A Phase B Count value
↑
L Increment
H
↑
Increment
↓
H Increment
L
↓
Increment
L
↑
Decrement
↑
H Decrement
H
↓
Decrement
↓
L Decrement
2 2 1 1 0 0 7 6 8 7 6 5 5 4 4 3 3
Pulse
Direction