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Offline Sw~ch Function - Mitsubishi Electric MELSEC-A Series User Manual

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4. A2CCPU
- - - - - - - - - - - - - - - - - - - - MELSEC-A
I
4.2.7
Offline switch function
While the A2CCPU is running (sequence program being executed), it is
possible to turn the sequence program OUT instruction devices on and off
with a peripheral device test function.
The offline switch function allows these devices to be turned on and off while
the A2CCPU is running with a peripheral device as the test function.
It is possible to check operation of OUT instruction devices, which are not
turned on/off by the sequence program, and to check the wiring between
the output module and an external device with the offline switch function.
Offline switch closed
OUT instruction
...... Online state
.1
f-------------<c:)()
.....
Offline state
.2
~
Offline switch opened
.' : The online state is established when the offline switch is closed. The OUT
instruction device is controlled (turned on/off)
by
the sequence program.
*2 :
The offline state is established when the offline switch is opened. The OUT
instruction is isolated from the sequence program. In the offline state, it is not
possible to control the OUT devices
by
the sequence program.
Fig. 4.21 Offline and Online State
(1) Devices which can be used by the offline switch function
The devices which can be used by the offline switch function are
indicated below:
(a) Outputs (V)
(b) Internal relays (M)
(c) Latch relays (L)
(d) Step relays (S)
(e) Link relays (B)
(f) Annunciators (F)
4-33

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