Omron CPM1A User Manual

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5-2 The CPM1A Cycle
The overall flow of CPM1A operation is as shown in the following flowchart. The
CPM1A is initialized internally when the power is turned on. If no errors are
detected, the overseeing processes, program execution, I/O refreshing, and
Peripheral Device servicing are executed consecutively (cyclically). The aver-
age cycle time can be monitor from a Peripheral Device.
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
Yes
No
Yes
Yes
Initialization processes
Note Initialization processes include clearing the IR, SR, and AR areas, presetting
system timers, and checking I/O Units.
The CPM1A Cycle
Section 5-2

Omron CPM1A Specifications

General

Model	CPM1A
Type	Compact PLC
Communication Ports	RS-232C (optional)
Instruction Set	Basic and advanced instructions
Operating Temperature	0 to 55°C
Storage Temperature	-20 to 75°C
Humidity	10% to 90% RH (non-condensing)
Power Supply	24 VDC or 100-240 VAC
Expansion	Expansion I/O units available
Timers	128
Counters	256 counters
I/O Points	10, 20, 30, or 40 points (depending on model)