Chapter 4 Relay Ladder Logic Programming 52
Counter Mode 3 (Fixed Count, Retentive)
Mode 3 Counter operation is similar to Mode 1 except its current count value is retentive. Mode 3 Counter will count up
to a fixed preset value and stop counting at that value. Additionally, the current count value is retentive and will keep its
current count after a loss of power to the smart relay. In the example below, the counter will stop counting when it
reaches the preset value of 20. Counter status bit C1 will be ON when the current value is 20.
Counter Mode 4 (Continuous Count, Retentive)
Mode 4 Counter operation is similar to Mode 2 except its current count value is retentive. Mode 4 Counter will
count up to a fixed preset value and continue counting after the preset value. Additionally, the current count value
is retentive and will keep its current count after a loss of power to the smart relay. In the example below, the
counter will continue counting after its preset value of 20. Counter status bit C1 will be ON when the current value
is 20.
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