How to Programming Counter and Timer using Omron CPM1A PLC :

A. Omron PLC Counter and Timer

A.1. Counter ( C)

Explanation :

CNT = Counter / PLC Counter
N = Number of counting
SV = Set Value #
CP = Pulse Input Signal
R = Reset Signal / PLC Counter Reset

CNT is used to count down from SV when the execution condition on the count pulse, CP, goes from OFF to ON. The present value (PV) will be decremented by one whenever CNT is executed with an ON execution condition for CP and the execution condition was OFF for the last execution. If the execution condition has not changed or has changed from ON to OFF, the PV of CNT will not be changed. The completion flag for a counter is turned ON when PV reaches zero and will remain ON until the counter is reset input (R), the PV is reset to SV . Counter number run from 000 through 127 in the CPM1A PLC.

A.2. Timer – TIM

Explanation :

TIM = Timer / PLC Timer
N = Number of time counting
SV = Set Value #

A timer is activated when its execution goes ON and reset (to SV) when the execution condition goes OFF. Once activated, TIM measures in units of 0.1 second from the SV.
SV is between 000.0 and 999.9 (The decimal point is not entered), Timer number run from 000 through 127 in the CPM1A PLC.