Omron CPM1 - PROGRAMING MANUAL 02-2001 Programming Manual page 534

CPM1/CPM1A Cycle Time and I/O Response Time
Input
point
Input
bit
Master
CPU
processing
CPU
processing
Slave
Output
point
Maximum I/O Response Time The CPM1/CPM1A takes the longest to respond under the following circum-
1, 2, 3...
I/O Maximum Response Time Input ON response time + Master's cycle time x 2 + Transmission time x 3 + Out-
Input
point
Input ON response time
Master
Input
bit
CPU
processing
CPU
processing
Slave
Output
point
516
3. The Slave's communications servicing occurs just after the transmission is
completed.
Input ON delay (8 ms)
Program
execution
Master's cycle time (10 ms)
Transmission time (12 ms)
Min. I/O response time = 8+10+12+15+10 = 55 ms
Calculation formula = Input ON response time + Master's cycle time + Slave's
cycle time + Output ON response time
stances:
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.
put ON response time
Program
Program
execution
execution
Master #1
Trans-
Master to Slave
mission
time
Program
execution
Slave #1
Maximum I/O response time = 8 + 10 x 2 + 12 x 3 + 15 x 3 + 10 = 119 (ms)
I/O refresh
Overseeing, communica-
tions, etc.
Master to
Slave
Program
execution
Slave's cycle time (15 ms)
Program Program
execution execution
(Data transmission according to input point)
Trans-
Slave to Master mission Master to Slave
time
Program Program
execution execution
Slave #2
Section
Output ON
delay (10 ms)
I/O refresh
Peripheral port servicing
Transmission time
Program
execution
Output OFF
Slave #3
response time
8-1