Omron SYSMAC C200H - Page 18

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