Panasonic MEWNET-F, Техническое руководство

Страница: 51 / 168

3-11
3.5.3 Input/Output Response Time for Remote I/O System [T
RES
]
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
RES
=T
IRES
+T
C
+T
ORES
T
RES
: Input/Output response time for Remote I/O system
T
IRES
: Input response time for Remote I/O system
T
C
: Output response time for Remote I/O system
T
ORES
: CPU scan time
The maximum values of input/output response time for the remote I/O system are obtained in the
following manner.
T
RES ･ MAX
=T
IRES ･ MAX
+T
C
+T
ORES ･ MAX
T
IRES ･ MAX
=T
IDLY
+T
R
+T
α
T
IDLY
: Input delay time
T
R
: Scan time for remote I/O system
T
α
: - When synchronous mode
- When T
C
<T
R,
T
α
=T
R
- When T
C
>T
R,
T
α
=T
C
- When asynchronous mode
- When T
C
<T
R,
T
α
=T
C
+T
R
- When T
C
>T
R,
T
α
=T
C
T
ORES ･ MAX
=T
R
×2+T
ODLY
Reference: For information on the synchronous mode and asynchronous mode,
<7.4 Remote I/O Update Timing Method"