Chapter 5 Relay Ladder Logic Programming 83
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is power up. The initial value equals to zero if the counter is in counting-up mode, but the preset value in
counting-down mode.
Counter Mode 3 (Non-Overtaking, Retentive)
Mode 3 Counter operation is similar to Mode 1 except its current count value is retentive when restart the power. Mode 3
Counter will count up to a fixed preset value and stop counting at that value, or stop counting when its current value is 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 stop counting when it reaches the preset value of 20.
Counter status bit C01 will be ON when the current value is 20.
This mode is similar to mode 1, but:
※ The current value will be kept when SG2 is in “Run” mode once the power is lost.
※ 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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