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Common Functions Section 7-1
Note (1) The Total ON Time Monitor function (Time) and Contact Operation
Counter function (Count) cannot be used simultaneously on one bit. Se-
lect one of these functions with the Maintenance Counter Mode Choice
setting.
(2) When the Maintenance Counter Mode Choice setting is changed, the col-
lected data (operations count or total ON time) will be cleared.
(3) These functions do not operate when the I/O power supply is OFF.
(4) The Total ON Time Monitor function checks whether the connected de-
vice is ON at about 1-s intervals. This function may not count the total ON
time precisely if the device is ON for intervals of less than 1 second.
■ Calculating the Total ON Time with 0.5-s ON Pulses
In figure A, the bit is actually ON for 0.5 s × 3 = 1.5 s, but the bit is ON just
once when the status is checked, so the total ON time is measured as 1 s.
In figure B, the bit is actually ON for 0.5 s × 3 = 1.5 s, but the bit is ON twice
when the status is checked, so the total ON time is measured as 2 s.
■ Calculating the Total ON Time with 1.5-s ON Pulses
In figure C, the bit is actually ON for 1.5 s × 2 = 3 s, but the bit is ON four times
when the status is checked, so the total ON time is measured as 4 s.
Figure A
0.5 s
Measured about 1 time/second
ON
OFF
Figure B
0.5 s
Measured about 1 time/second
ON
OFF
Figure C
1.5 s
Measured about 1 time/second
ON
OFF
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