Chapter 5 Relay Ladder Logic Programming
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Counter Mode 5 (Overtaking, Up-Down Count, Non-Retentive)
Mode 5 Counter’s operation is similar
to Mode 2, overtaking and non-reten
tive. Its status bit will be ON when the
counter current value isn’t less than its preset value, and will be OFF when the curr
ent value is less than its preset value.
The Mode 5 Counter will count up to a fixed preset value and continue counting even reach the preset value.
Additionally, the current count value is non-retentive and will reset to 0 when power lost. A
dditionally, the Mode 5 counter
is always reset to zero, and the current value also is always 0 when the smart switches between RUN and STOP
unrelated to the state of its direction bit. 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 is 20.
※
Under this mode, the count will continuous after reaching its preset value;
※
The current value is always 0 regardless of
the state of
its direction bit when the reset is availability;
※
The current value is always 0 regardless of
the state of
its direction bit when the smart switches between RUN and
STOP.
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