Cpu Unit Operation - Omron CQM1H - PROGRAM Programming Manual

CPU Unit Operation

7-1 CPU Unit Operation
Operation Flowchart
Set error flags
and activate
indicators.
ERROR or ALARM?
ERROR
(lit)
474
The overall flow of CQM1H operation is as shown in the following flowchart.
The time required to execute one cycle of CPU Unit operation is called the
cycle time.
Power application
Is DIP switch
pin 2 ON?
Transfer contents of
Memory Cassette to CPU
Unit.
Clear IR, SR, AR areas;
preset timers; and check
I/O Units, Inner Boards and
Communications Units
Check hardware and
Program Memory.
No
Check OK?
Service Inner Boards
with control functions.
(See note 1.)
Preset cycle time
ALARM
monitoring time.
(flashing)
Execute user's program.
End of program?
Yes
Check cycle time setting.
Minimum
cycle time?
Yes
Wait until minimum cycle
time expires.
Compute cycle time.
Refresh input bits and
output terminals.
Service RS-232C port.
Service peripheral port.
Service Inner Boards with
communications functions
(See note 2.)
Service Communications
Unit.
OFF
ON
Yes
No
No
Section 7-1
Initialization
Overseeing
processes
Program
execution
Cycle time
processing
Cycle
time
I/O refreshing
Service RS-
232C interface.
Service
peripheral port.
Service Inner
Boards (com-
munications)
Service
Communications
Unit