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8-1
Section
CPM1/CPM1A Cycle Time and I/O Response Time
515
Maximum I/O Response Time
The CPM1/CPM1A takes longest to respond when it receives the input signal
just after the input refresh phase of the cycle, as shown in the illustration below.
In that case, a delay of approximately one cycle will occur.
Input ON delay (8 ms)
I/O refreshing
Input
point
Input
bit
Output
point
Program execution
and other processes
(15 ms)
Max. I/O response time = 8+15
×
2+10 = 48 ms
Output ON delay (10 ms)
I/O refreshing
Program execution
and other processes
(15 ms)
I/O refreshing
8-1-4 One-to-one PC Link I/O Response Time
When two CPM1/CPM1As are linked 1:1, the I/O response time is the time re-
quired for an input executed at one of the CPM1/CPM1As to be output to the
other CPM1/CPM1A by means of 1:1 PC Link communications.
The minimum and maximum I/O response times are shown here, using as an
example the following instructions executed at the master and the slave. In this
example, communications proceed from the master to the slave.
Input
Output (LR)
Input
(LR)
Output
Master
Slave
The following conditions are taken as examples for calculating the I/O response
times. In CPM1/CPM1A PCs, LR area words LR 00 to LR 15 are used in 1:1 data
links and the transmission time is fixed at 12 ms.
Input ON delay:
8 ms (input time constant: default setting)
Master cycle time:
10 ms
Slave cycle time:
15 ms
Output ON delay:
10 ms
Peripheral port:
Not used.
Minimum I/O Response Time
The CPM1/CPM1A responds most quickly under the following circumstances:
1, 2, 3...
1. The CPM1/CPM1A receives an input signal just prior to the input refresh
phase of the cycle.
2. The Master’s communications servicing occurs just as the Master-to-Slave
transmission begins.