Chapter 4 Relay Ladder Logic Programming 54
Counter Mode 6 (Continuous Count, Up-Down Counter, Retentive)
Mode 6 Counter operation is similar to Mode 4 where its current count value is continuous and retentive, except its
C1 status bit will only be ON when the counter counts up to its preset or down to its preset from a count higher
than its preset. Even with its direction bit set to ON, it will not turn on its C1 status bit when it counts down to zero.
The C1 status bit is fixed to the non-zero preset value regardless of the state of the direction bit. Additionally, the
Mode 5 counter is always reset to zero, unrelated to the state of its direction bit.
The Mode 6 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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