Mitsubishi Electric MELSEC-Q Series User Manual page 56

4 SEQUENCE PROGRAM CONFIGURATION & EXECUTION
CONDITIONS
4 - 17
(2) Response lag
Output response lags of up to 2 scans can result from input module changes.
(See Fig.4.7)
Ladder examples
X5
55
Fastest possible Y5E ON
External contact
Q00J/Q00/
Q01CPU
devices
The fastest possible Y5E ON occurs if the external contact is switched ON
immediately prior to the refresh operation. X5 then switches ON at the input refresh,
Y5E at step 56 switches ON, and the external load switches ON at the output refresh
following execution of the END instruction. In this case, the time lag between the
external contact ON and the external load ON is 1 scan.
Slowest possible Y5E ON
External contact
Q00J/Q00/
Q01CPU
devices
The slowest possible Y5E ON occurs if the external contact is switched ON
immediately prior to the refresh operation. X5 then switches ON at the input refresh,
Y5E at step 56 switches ON, and the external load switches ON at the output refresh
following execution of the END instruction. In this case, the time lag between the
external contact ON and the external load ON is 2 scan.
Fig.4.6 Output "Y" change in response to input "X" change
Y5E
Input refresh Input refresh
0 END 0 56
ON
OFF
ON
OFF
X5
OFF
Y5E
OFF
External load
Lag time
(Minimum 1 scan)
Input refresh Input refresh
0 END 0 56
ON
OFF
ON
OFF
X5
OFF
Y5E
OFF
External load
Lag time
(Maximum 2 scan)
MELSEC-Q
Ladder for switching the Y5E output
ON in response to an X5 input ON.
Output refresh
0
END
ON
ON
Output refresh
END 0
ON
ON
4 - 17