Relays, Memory Areas and Constants
1-36
1.2.8 Counter (C)
Function of counters (C)
When the decrement−type preset counter is activated and the elapsed value reaches
zero, the counter contact with the same number as the counter turns on.
When the counter’s reset input is turned on, the counter contact turns off.
CT n
Cn
Cn:on
Reset input
Count input
Counter number
Counter contact: on
n: Counter number
Count−up
Usage restrictions
When used as contacts, there are no resrictions on the number of times that can be
used.
For the FP2/FP2SH/FP10SH, if the Initialize/Test switch is set to the upper side (the
Initialize side) in the PROG mode, the counter contact goes off. If a hold type has been
specified, it goes off as well.
Note
With the FP2SH/FP10SH, system register 4 can be set in such a
way that the counter contact is not cleared even if the Initialize/
Test switch is set to the upper side.
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