8-1
Section
CPM1/CPM1A Cycle Time and I/O Response Time
516
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 (12 ms)
Slave’s cycle time (15 ms)
Min. I/O response time = 8+10+12+15+10 = 55 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
CPU
processing
CPU
processing
Master
Slave
Calculation formula = Input ON response time + Master’s cycle time + Slave’s
cycle time + Output ON response time
Maximum I/O Response Time
The CPM1/CPM1A takes the longest to respond under the following circum-
stances:
1, 2, 3...
1. The CPM1/CPM1A 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 servic-
ing ends.
I/O Maximum Response Time
Input ON response time + Master’s cycle time x 2 + Transmission time x 3 + Out-
put ON response time
Output
point
I/O refresh
Peripheral port servicing
Input
point
Input
bit
Program
execution
CPU
processing
Master
Slave
Input ON response time
Master #1
Trans-
mission
time
(Data transmission according to input point)
Program
execution
Program
execution
Program
execution
CPU
processing
Program
execution
Program
execution
Slave #1
Program
execution
Program
execution
Slave #2
Slave #3
Master to Slave
Trans-
mission
time
Slave to Master
Transmission time
Master to Slave
Maximum I/O response time = 8 + 10 x 2 + 12 x 3 + 15 x 3 + 10 = 119 (ms)
Output OFF
response time
Содержание SRM1 - PROGRAMING 02-2001
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