r'
4.
AZCCPU
/MELSEC=A
4.2.7
Mine
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
APCCPU
is running
with
a
peripheral device the
test function.
It
is
possible
to
check operation of
OUT
instruction devices, which
are not
turned
odoff 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
II
h
I.
*2
Offline state
LOffline switch opened
*1:
The online state is established when the offline switch is closed. The
,
OUT instruction device
is
controlled (turned
ordoff)
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
(Y)
(b)
Internal relays
(M)
(c) Latch relays 1L)
(d)
Step relays
(S)
(e) Link relays
(B)
(
f) Annunciators
(F)
(2)
Status of devices in the offline state
The device status
in
the offline state (offline switch opened) is
described below.
(a)
The
ON/OFF
state that exists before just before the offline
(b)
When a forced setheset is conducted using a peripheral in
the offline state, the resetket state after the forced setheset
is retained.
state is established is retained.
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