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4-3
4 Monitoring and Computing the Cycle Time
CP1E CPU Unit Instructions Reference Manual(W483)
4-2 Computing the Cycle Time
4
4-2-1 CPU Unit Operation Flowchart
4-2 Computing the Cycle Time
The CPU Unit processes data in repeating cycles from the overseeing processing up to peripheral
servicing as shown in the following diagram.
4-2-1 CPU Unit Operation Flowchart
Power ON
Check OK?
End of program?
Sets error flags
Calculates cycle time
I/O refresh
I/O refresh
Peripheral servicing
NO
YES
Error
Normal
Checks Unit connection status
Checks hardware and user
program memory
ERR/ALM
indicator ON or
flashing?
Flashing (non-
fatal error)
Lit (fatal error)
Startup initializationOverseeing processingProgram execution
Cycle time calculation
PLC cycle time
Peripheral
servicing
User program executed
Cyclic task executed
Waits until the set cycle time
has elapsed (when the
minimum cycle time is valid)