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5 Understanding Programming

5-34

CJ2 CPU Unit Software User’s Manual

Task Start Flag (A200.14)

The Task Start Flag turns ON whenever cyclic task status changes from STANDBY status to READY

status (whereas the Initial Task Execution Flag (A200.15) turns ON only once, the Task Start Flag

will turn ON every time the status changes from STANDBY status to READY status).

The Task Start Flag can be used to perform initialization processing whenever a task goes from

STANDBY to READY status, i.e., when a task on STANDBY is enabled using the TKON(820)

instruction.

z Interrupt Task Flags and Words

Maximum Interrupt Task Processing Time (A440)

The maximum processing time for an interrupt task is stored in binary data in 0.1-ms units and is

cleared at the start of operation.

Interrupt Task with Maximum Processing Time (A441)

The interrupt task number with maximum processing time is stored in binary data. Here, 8000 to

80FF hex correspond to task numbers 00 to FF Hex.

This data is cleared at the start of operation.

Duplicate Refresh Error Flag (Nonfatal Error) (A402.13)

If Duplicate Refresh Error Detection is enabled in the PLC Setup, the Duplicate Refresh Error Flag

will turn ON if a duplicate refresh error occurs.

* The values in words A440 and A441 will not be valid if High-speed interrupt function is enabled in the PLC Setup.

A200.14

Task Start Flag

Task n

Disabled

Ready

Task Start Flag

Initialization

processing

Task Start Flag

Initialization

processing

Omron CJ2 CPU UNIT SOFTWARE User Manual

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