Omron SYSMAC CPM2B-S001M-DRT Operation Manual page 146

One-to-one PC Link I/O Response Time
Minimum I/O Response
Time
Master
Slave
Maximum I/O Response
Time
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The following conditions are taken as examples for calculating the I/O
response times. In CPM2B-S 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:
Master cycle time:
Slave cycle time:
Output ON delay:
The CPM2B-S responds most quickly under the following circumstances:
1,2,3... 1. The CPM2B-S 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.
3. The Slave's communications servicing occurs just after the transmission is
completed.
The minimum I/O response time = Input ON response time + Master's cycle
time + Transmission time + Slave's cycle time + Output ON response time
Input
point
Input ON delay (10 ms)
Input
bit
Program
CPU
execution
processing
Master's cycle time (10 ms)
CPU
processing
Output
point
Min. I/O response time = 10+10+12+15+15 = 62 ms
The CPM2B-S takes the longest to respond under the following circum-
stances:
1,2,3... 1. The CPM2B-S receives an input signal just after the input refresh phase of
the cycle.
2. The Master's communications servicing just misses the Master-to-Slave
transmission.
3. The transmission is completed just after the Slave's communications ser-
vicing ends.
10 ms (input time constant: default setting)
10 ms
15 ms
15 ms
Master to
Slave
Transmission time (12 ms)
Program
execution
Slave's cycle time (15 ms)
Section 8-4
I/O refresh
Overseeing, communications
servicing, etc.
Output ON
delay (15 ms)
135