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SRM1 Cycle Time and I/O Response Time Section 7-3
3. The Slave’s communications servicing occurs just after the transmission is
completed.
Maximum I/O Response
Time
The SRM1 takes the longest to respond under the following circumstances:
1,2,3... 1. The SRM1 receives an input signal just after the I/O 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.
Output
point
Master's cycle time (10 ms)
Program
execution
Transmission time (39 ms)
Slave's cycle time (15 ms)
Min. I/O res
onse time = 8+10+39+15+10 = 82 ms
Input
point
Input
bit
I/O refresh
Overseeing, communica-
tions, etc.
Input ON delay (8 ms)
Master to
Slave
Output ON
delay (10 ms)
Program
execution
Output
point
Master's cycle time (10 ms)
Transmission time (39 ms 3)
Slave's cycle time (15 ms)
Max. I/O response time = 8 + 10 2 + 39 3 + 15 2 + 10 = 185 ms
I/O refresh
Overseeing, communica-
tions, etc.
Input ON delay (8 ms)
Input
point
Input
bit
Master to
Slave
Slave to
Master
Master to
Slave
Output ON
delay (10 ms)
Program
execution
Program
execution
Program
execution
Program
execution
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