Counter C - Mitsubishi Electric A800 Programming Manual

3.10

Counter C

The PLC function uses up-timing counters.
The up-timing counter turns its contact ON when the count value reaches a setting value.
Count processing
• The counter's coil turns on/off at execution of the OUT C
and its contact turns ON after the END instruction is executed.
• The counter detects the coil's rise (OFFON) and then starts counting. Therefore, it will not start counting if the coil
remains ON.
Counter reset
• The count value is not cleared even when the coil turns OFF. Use the RST C
turn the contact OFF.
• If the counter is reset with the RST instruction, the counter's present value and contact are cleared at execution of the
RST instruction.
Ladder example
Input condition
instruction, and then the counter's present value is updated
instruction to clear the count value and
C0 counts on leading edge (OFF to ON)
of input X5.
Resets C0 when input X6 turns ON.
Sequence program

Counter C

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