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CPM1/CPM1A Cycle Time and I/O Response Time Section 7-2
7-2 CPM1/CPM1A Cycle Time and I/O Response Time
7-2-1 The CPM1/CPM1A Cycle
The overall flow of CPM1/CPM1A operation is as shown in the following flow-
chart.
Note Initialization processes include clearing the IR, SR, and AR areas, presetting
system timers, and checking I/O Units.
Power application
Check hardware and
Program Memory.
Check OK?
Preset cycle time
monitoring time.
Execute user program.
End of program?
Check cycle time set-
ting.
Minimum
cycle time set?
Wait until minimum cycle
time expires.
Compute cycle time
.
Refresh input bits and
output terminals.
Service peripheral port.
Set error flags and
activate indicators.
ERROR or ALARM?
No
ERROR
(lit)
ALARM
(flashing)
Initialization
Overseeing
processes
Program
execution
Cycle time
processing
I/O refreshing
Service
peripheral
port.
Cycle
time
No
Ye s
No
Ye s
Ye s
Initialization processes
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