Omron CRT1 - 10-2008 Operation Manual page 439

Word Slave Unit and Bit Slave Unit Functions
Note
416
• Measurement time: 0 to 4,294,967,295 s
• Measurement unit: s
Stored in Slave
Total ON time
Unit memory
Sensor
(1) The total ON time monitor and the contact operation monitor cannot be
used for the same contact at the same time. Select only one of these
functions under the Detection Mode.
(2) This function does not operate if the I/O power is not turned ON.
(3) The Total ON Time Monitor Function checks at 1 second intervals wheth-
er or not the connected device is turned ON. Keep this in mind when mea-
suring total ON times for inputs of less than 1 s.
■
Measuring an ON Time of 0.5 s
As shown in Figure A, the actual ON time is 1.5 s (3 × 0.5 s) but the total ON
time is measured only as 1 s because the input is ON only once when a mea-
surement is taken.
Measured approx. every 1 s
ON
OFF
0.5 s
Figure A
In Figure B, the actual ON time is 1.5 s (3 × 0.5 s) but the total ON time is
measured as 2 s because the input is ON twice when a measurement is
taken.
Measured approx. every 1 s
ON
OFF
0.5 s
Figure B
■
Measuring an ON Time of 1.5 s
In Figure C, the actual ON time is 3 s (2 × 1.5 s) but the total ON time is mea-
sured as 4 s because the input is ON 4 times when a measurement is taken.
(Stored data: 0000 0000 to FFFF FFFF hex)
Slave Unit
I/O power supply
Total ON time
Connected device
Section 11-3
ON
OFF