Omron CPM2C-S100C Operation Manual page 179

One-to-one PC Link I/O Response Time
Input
point
Input
bit
Master
CPU
processing
CPU
processing
Slave
Output
point
Maximum I/O Response
Time
1,2,3...
Input
point
Input ON delay (10 ms)
Input
bit
CPU
processing
Master's cycle time (10 ms)
Output
point
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 ON delay (10 ms)
Program
execution
Master's cycle time (10 ms)
Transmission time (12 ms)
Min. I/O response time = 10+10+12+15+15 = 62 ms
The CPM2C-S takes the longest to respond under the following circum-
stances:
1. The CPM2C-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.
The maximum I/O response time = Input ON response time + Master's cycle
time × 2 + Transmission time × 3 + Slave's cycle time × 2 + Output ON
response time
Program Program
execution execution
Maximum I/O response time = 10 + 10 × 2 + 12 × 3 + 15 × 2 + 15 = 111 (ms)
Master to
Slave
Program
execution
Slave's cycle time (15 ms)
I/O refresh
Overseeing, communications
servicing, etc.
Master Master Master
to Slave to Slave to Slave
Transmission time (12 ms × 3)
Program
execution
Slave's cycle time (15 ms)
Section 7-4
I/O refresh
Overseeing, communications
servicing, etc.
Output ON
delay (15 ms)
Program
execution
Output ON
delay (15 ms)
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