Chapter 5 Relay Ladder Logic Programming
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Counter Mode 6 (Overtaking, Up-Down Count, Retentive)
Mode 6 Counter’s operation is similar to Mode
4, its current count value is overtaking and retentive. Its status bit will
be ON when the counter current value isn’t less than its preset value, and will be OFF when the current value is less than its
preset value. Additionally, the Mode 6 counter is always reset to zero, regardless of the state of its direction bit. The current
count value is retentive and will keep its current count after power lost. And Co
unter will keep current value 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 5, but:
※
The current value is kept when power lost in Run mode.
※
The current value is kept when change the mode between RUN and STOP if “C Keep” is active.
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