Computing The Cycle Time; Cpu Unit Operation Flowchart - Omron SYSMAC CS Series Operation Manual

Computing the Cycle Time

10-4 Computing the Cycle Time

10-4-1 CPU Unit Operation Flowchart

Normal Processing Mode
Sets error flags
ERR/ALM indicator
ON or Flashing?
ON (fatal error)
The CS-series CPU Units process data in repeating cycles from the oversee-
ing processing up to peripheral servicing as shown in the following diagram.
Power ON
Checks Unit
connection status.
Checks hardware
and user program
memory
NO
Check OK?
Flashing (non-
fatal error)
Executes user pro-
gram (i.e., executes
READY cyclic tasks).
End of program?
Resets watchdog
timer and waits un-
til the set cycle
time has elapsed
Calculates cycle
time
Performs I/O re-
freshing
Services Program-
ming Devices
Startup initializa-
tion
Overseeing pro-
cessing
YES
Program execu-
tion
NO
YES
Cycle time cal-
culation
I/O refreshing
Peripheral servic-
ing
Section 10-4
PLC cycle
time
495