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Chapter 5 Relay Ladder Logic Programming
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Counter Mode 4 (Overtaking, Retentive)
Mode 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 won’t 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 isn’t less than 20.
This mode is similar to mode 2, but:
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The current counter value will be kept when SG2 is in “Run” mode once the power is lost.
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The current counter value will be kept when the SG2 is switched between RUN and STOP if “C-keep” is active.
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