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<7. I/O Communications >
7-11
IM 34M6H28-01E
1st Edition : Feb.01,1999-00
7.4
I/O Response Time
The I/O response time is the time from the start of input to the slave, followed by ladder
program processing, until output from the slave.
From a ladder program, read the input data from this module using the special module read
command READ. Perform the required processing and write the output data to the module
using the special module write command WRITE. The maximum I/O response time re-
quired for the above processing is estimated as follows.
Maximum I/O response time = transmission time interval
3
2 + 1 scan time
+ input delay in slave + output delay in slave
It is the same whether the transmission time interval is longer or the time for one scan
is longer.
CPU module
This module
I/O transmission
I/O response delay
One scan
Transmission time interval
F0708.EPS
Figure 7.8 Maximum I/O Response
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