Mitsubishi Electric Melsec A Series - END Processing

I
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4. A2CCPU
-------------------- MELSEC-A
(4) Self-diagnosis
The PC CPU
conducts self-checks when it is powered up or reset. For
further details, see Section 4.3.1.
4.1.3 END processing
END processing returns the A2C to step 0 after
the END (FEND) instruction
execution to allow repeated operation processing.
(1) CPU error check
Checks battery power, etc.. See Section 4.3.1 for details.
(2) Timer/counter processing
Updates timer/counter present values and
contact status. For further
details, see Section 4.1.4 and 4.1.5.
(3) Sampling trace processing
Stores
the specified device status to the sampling trace area when the
sampling trace is executed every scan (after END execution)
(4) Operation state check
Checks operation state of the A2C and switches to
the RUN, STOP or
PAUSE state. For transition processing to
the RUN, STOP and PAUSE
states, see Section 4.1.9.
(5) Constant scan processing
Allows
the repeated operation processing to be initiated after the
specified constant scan time (set to special data register D9020) is
reached.
(6) Link refresh processing
After receiving a link refresh request signal from
the MELSECNET data
link, link refresh processing is executed.
The A2CCPUP21/R21 can set link refresh enable/disable by M9053 and
DI/EI instructions.
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