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12 CPU Unit Cycle Time
12-2 Computing the Cycle Time
12-2-1 CPU Unit Operation Flowchart
The CJ-series CPU Units process data in repeating cycles from the overseeing processing up to I/O
refreshing as shown in the following diagrams.
Sets error flags
ERR/ALM indicator ON
or Flashing?
12-4
Checks Unit
connection status.
Checks hardware and user
program memory.
No
Flashing
(non-fatal error)
Executes user program
(i.e., executes READY
cyclic tasks).
ON (fatal error)
End of program?
Performs peripheral
servicing and calculates
the cycle time.
Performs I/O refreshing.
Power ON
Check OK?
Yes
No
Yes
CJ2 CPU Unit Software User's Manual
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