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Functions of Digital I/O Units Section 4-4
4-4-4 Contact Operation Counter
Function Overview The Contact Operation Counter is used to count the number of times each
input or output contact has changed from OFF to ON (maximum resolution
50 Hz) and record the total value calculated in the Unit.
The monitor value can be set in the Unit, and when the set number of opera-
tions is reached, the Connected Device Maintenance Flag in the Status Area
will be turned ON. (The Programming Device can be used to read the status
of the Connected Device Maintenance Flag.)
• Counted operations: 0 to 4,294,967,295 operations (stored data:
00000000 to FFFFFFFF hex)
• Counting unit: One operation
Note 1. The Contact Operation Counter and Total ON Time Monitor cannot be
used at the same time for a single contact. Select the function to be used
in the Detection Mode Area.
2. The Contact Operation Counter will not operate unless I/O power is being
supplied.
OFF to ON
3 2 1
Slice I/O Unit
Output device
(relay, etc.)
Recorded in the Unit
Number of times output
contact goes OFF to ON.
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