Pc Operation Flowchart - Omron SYSMAC C200H Installation Manual

How Does a PC Work?

PC Operation Flowchart

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