Response Delay In Refresh Mode - Mitsubishi Electric A800 Programming Manual

I/O processing method
3.6.2

Response delay in refresh mode

The following description is about the output delay for the varied inputs.
As shown in the figures below, change in the output lags behind that in the input by up to two scans.
Ladder example
 When Y1E turns ON at the earliest timing
The Y1E output turns ON at the earliest timing when the control input terminal turns ON immediately before the refresh. In
this case, X5 turns ON at input refresh, Y1E turns ON at step 0, and then the control output terminal turns ON at output
refresh after END instruction execution.
Therefore, change in the control output terminal occurs one scan behind that in the control input terminal.
 When Y1E turns ON at the latest timing
The Y1E output turns ON at the latest timing when the control input terminal turns ON immediately after the refresh. In this
case, X5 turns ON at the next input refresh, Y1E turns ON at step 0, and then the control output terminal turns ON at the
output refresh after END instruction execution.
Therefore, change in the control output terminal occurs two scans behind that in the control input terminal.
80
Sequence program
In this ladder, output Y1E turns ON when input
X5 turns ON.
Input refresh Input refresh
0 END 0 56
ON
OFF
Control input
ON
terminal
OFF
X5
OFF
Y1E
OFF
Control output
Delay
terminal
(Minimum 1 scan)
Input refresh Input refresh
0 END 0 56
ON
OFF
Control input
ON
terminal
OFF
X5
OFF
Y1E
OFF
Control output
Delay
terminal
(Maximum 2 scans)
Output refresh
END 0
ON
ON
Output refresh
END 0
ON
ON