Omron SYSMAC C200H Installation Manual page 18

How Does a PC Work?
PC Operation Flowchart
Sets error flag and
lights indicator
Alarm
Error or alarm?
Error
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Power application
Clears data areas and
resets System counters
Checks I/O Units
Resets watchdog timer
Checks hardware and
program memory
No
Check OK?
Yes
IR data to Output Units
Proceses remote I/O
Resets watchdog timer
Services peripherals
End of program?
Yes
Resets watchdog timer
Input Unit data to IR area
Resets watchdog timer
and program counter
Executes program
End of program?
Yes
No
Instruction
execution
Section 1-3
Initial
processing
on power
application
Common
processes
Output
refresh-
ing
Remote
proces-
sing
No
PC
Servic-
cycle
ing
time
periph-
eral
devices
Input
refreshing
7