Omron SYSMAC C Series User Manual page 83

Instruction words
Ladder diagram
COUNTER (CNT)
Ladder diagram
0000 0001
0002
3 counts
CNT10 Ga)
Consecutive OUT instruction and TIM instruction
Using this circuit, a LD instruction produces an output and simultaneously
turns on a timer.
Coding chart
[instruction] Daa |
(counter no.) (set value)
Function
Performs down-counter operation
Remarks
This instruction can be used as a preset counter in the same manner as a
relay circuit. The preset value can be between 0 and 9999 counts.
Counter numbers can be assigned from 00 to 47. Do not give counters
and timers the same number.
The counter resets when the contents of the result register are logical 1
and starts counting when the contents of the register are logical 0. The
count input is provided from the stack register.
A count-up contact designates the counter number. NO and NC contacts
can be used in combination, and in any quantity.
The counter decrements, producing an output when the count value
becomes 0000. The present value of the counter returns to the preset
value when a reset input is applied. The counter output is transmitted to
an externa! device through an output relay as shown in the ladder
diagram.
After the preset count is finished, any additional counts are ignored.
The program for a counter must be entered in the order of a count input
circuit, a reset input circuit, and a counter coil.
Coding chart
AND-NOT
LD