Chapter 5 Relay Ladder Logic Programming 86
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Counter Mode 4 (Overtaking, Retentive)
Mo
de 4 Counter operation is similar to Mode 2 except its current count value is retentive. The current count value is
retentive and will keep its current count after power lost. Mode 4 Counter will count up to a fixed preset value and then
continue counting after the preset value, but it will not count when the current value equals 0 if it’s configured as counting-down
mode . Additionally, the current count value is retentive when the smart switches between RUN and STOP if “C Keep” is active.
In the example below, the counter will continue counting after its preset value of 20. Counter status bit C01 will be ON when
the current value is not less than 20.
Th
is mode is similar to mode 2, but:
※ The current counter value will be kept when iSmart is in “Run” mode once the power is lost.
※ The current counter value will be kept when the iSmart is switched between RUN and STOP if “C-keep” is active.
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