Mitsubishi 800 Series User Manual page 124

72. System Configurations
When Making Bus Connections
MELSEC GOT
When using a bus connection, there are some restrictions on the number of GOTs that can be
connected, depending
on
the PC CPU
to
which the GOTs are connected, and the number of
special function modules installed.
QDCPU
ADACPU,
AI7ucPtl,
A2USCPU
Other
CPU
No. of
GOTs
which can be
up
to 2
up
to 3
up to 3
connected
No.
of
GOTs
+
can be installed
*2 special function special function mod-
up
to
altogether
can be in-
modules which
cluding
GOTs
and the cluding
GOTs
and the
' 2
function modules
listed in
*'
'
special function
Up
to
2
altogether,
in-
Up to 6
altogether, in-
No limit for and special
stalled, including
GOT
and spe-
cia1 function modules listed in
*2.
u,eS
modules
*1, Special function modules of the following models:
AJ71 QC24 (R2/R4)
*2. Special function modules of the following models:
AD51 (S), AD51 H(S3), AD51FD(S), AD57G(S3),
A171C21(S1),
AJ71 C23,
AJ71 C24(S3/S6/S8), AJ71 E71, AJ71 C22(S7), AJ71 UC24, A1 SJ71 UC24(R2/PRF/R4),
A1 SJ71 E71
12.1.4 Supplying
power to the PC CPU and
the GOT
When supplying power to the PC CPU and the GOT, please observe the precautions noted below.
(1) Always use one of the procedures below to turn
on
the power supply to the PC CPU and GOT.
One of these procedures should be used even if several GOTs are connected to the CPU.
@ Turn on the power supply to the PC CPU and the GOT at the same time.
@
Turn on the power supply to the PC CPU first, and then to the GOT.
If several GOTs have been connected, and the power supplies are being turned on one by
one, the power supplies may be turned on in any order.
(2) If the power supply is turned on using method
@
above, the CPU begins to run when the
power supply to the GOT is turned on. If several GOTs have been connected, turning on the
power supplies to all of the GOTs runs the CPU.
(3) When power is being supplied to the PC CPU and the GOT, turning off the power supply to the
PC CPU causes a communications error.
If this happens, turn off the power supply to the GOT and follow procedure (1) above
to turn on
the power supplies to the PC CPU and the GOT.
(4)
The PC CPU continues to run even if the power supply to the GOT is turned off during monitoring.
0 When disconnecting the expansion cable that connects the PC CPU and the GOT,
A
CAUTION
to prevent errors from occurring, make sure the power supplies to the PC CPU and
the GOT are turned off first.
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