8-3
Section
SRM1(-V2) Cycle Time and I/O Response Time
541
8-3-4 One-to-one PC Link I/O Response Time
When two SRM1s are linked in a 1:1 PC Link, the I/O response time is the time
required for an input executed at one of the SRM1s to be output to the other
SRM1 by means of 1:1 PC Link communications.
Minimum I/O Response Time
The SRM1(-V2) responds most quickly under the following circumstances:
1, 2, 3...
1. The SRM1(-V2) receives an input signal just prior to the I/O 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.
Output
point
Master’s cycle time (10 ms)
Program
execution
Transmission time (39 ms)
Slave’s cycle time (15 ms)
Min. I/O response 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
Maximum I/O Response Time
The SRM1(-V2) takes the longest to respond under the following circum-
stances:
1, 2, 3...
1. The SRM1(-V2) 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.