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157
One-to-one PC Link I/O Response Time
Section 7-4
The minimum I/O response time = Input ON response time + Master’s cycle
time + Transmission time + Slave’s cycle time + Output ON response time
Maximum I/O Response
Time
The CPM2C-S takes the longest to respond under the following circum-
stances:
1,2,3...
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
Output
point
Master's cycle time (10 ms)
Program
execution
Transmission time (12 ms)
Slave's cycle time (15 ms)
Min. I/O response time = 10+10+12+15+15 = 62 ms
Input
point
Input
bit
I/O refresh
Overseeing, communications
servicing, etc.
Input ON delay (10 ms)
Master to
Slave
Output ON
delay (15 ms)
Program
execution
CPU
processing
CPU
processing
Master
Slave
Output
point
Master's cycle time (10 ms)
Program
execution
Transmission time (12 ms
×
3)
Slave's cycle time (15 ms)
Input
point
Input
bit
I/O refresh
Overseeing, communications
servicing, etc.
Input ON delay (10 ms)
Output ON
delay (15 ms)
CPU
processing
Program
execution
Master
to Slave
Master
to Slave
Master
to Slave
Program
execution
Program
execution
Maximum I/O response time = 10 + 10
×
2 + 12
×
3 + 15
×
2 + 15 = 111 (ms)
Содержание CPM2C-S100C
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