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3.5.3 Input/Output Response Time for Remote I/O System [T
The input/output response time for a remote I/O system represents the time it takes to send the input
signal from the slave station to teh CPU via the master unit and perform the processing, and the time
until the output signal is actually sent to teh slave station based on the processing result.
T
=T
RES
IRES
The maximum values of input/output response time for the remote I/O system are obtained in the
following manner.
T
=T
RES･MAX
T
=T
IRES･MAX
T
ORES･MAX
Reference: For information on the synchronous mode and asynchronous mode,
<7.4 Remote I/O Update Timing Method"
+T
+T
C
ORES
T
: Input/Output response time for Remote I/O system
RES
T
: Input response time for Remote I/O system
IRES
T
: Output response time for Remote I/O system
C
T
: CPU scan time
ORES
+T
+T
IRES･MAX
C
ORES･MAX
+T
+T
α
IDLY
R
T
: Input delay time
IDLY
T
: Scan time for remote I/O system
R
T
: - When synchronous mode
α
- When T
- When T
- When asynchronous mode
- When T
- When T
=T
×2+T
R
ODLY
<T
T
=T
α
C
R,
R
>T
T
=T
α
C
R,
C
<T
T
=T
+T
α
C
R,
C
R
>T
T
=T
α
C
R,
C
]
RES
3-11
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