IDEC High Performance Series - Manual (Page 1240)

2 Digital I/O Units
29-6 WindO/I-NV2 User’s Manual
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Operation with priority on control processing
■ Input refresh
Inputs on the digital I/O unit are reflected in the HG Digital Input (LEX).
■ Input delay
There is a delay between the digital I/O unit input and the internal device HG Digital Input (LEX). The minimum delay
is 5 microseconds, and the maximum delay period is calculated by the amount of 5 microseconds and the execution
period.
■ I/O control
The script specified as the Cyclic Script executes during I/O control.
■ Output refresh
HG Digital Output (LEY) are output to the digital I/O unit.
Cyclic
Script
Display
processing
Input refresh
Output refresh
LEX
LEY
X
I/O control
Sleep
(Display
processing
executed)
End of processing
for part at bottom
of screen
Start of processing
for part at top
of screen
Execution Period
Execution
Period
External
input
Y
External
output
HG Digital Input
HG Digital Output
Input delay
Output
delay
Execution Period
When an input occurs in the digital I/O unit immediately after the
input refresh ends, the input delay will be the longest because the
processor waits for the input refresh in the next scan before reflecting
the input to the HG Digital Input (LEX).
LEX
X
Input refresh
Output refresh
I/O control
Sleep
(Display
processing
executed)
Input refresh
Output refresh
I/O control
Input delay
(maximum)
HG Digital Input
External
input