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MELSOFT
A
PPENDICES
Appendix 4 Multi-CPU System
The valid CPU number specified for a multi-CPU system is that of the last accessed
station only.
When making access to the non-control CPU of the relay module on the accessed
station, use the modules of function version B as the relay modules and QCPUs (Q
mode) on the own station, all relay stations and accessed station.
(Example 1) CPU COM communication
When the programmable controller CPU No. 3 (0x3E2) is specified for
access, access is made to the CPU
.
:QCPU (Q mode) No. 1
:QCPU (Q mode) No.
2
:QCPU (Q mode) No.
3
:QCPU (Q mode) No.
4
Personal
compute
r
Last access target
(Example 2) CPU COM communication (via MELSECNET/H)
When the programmable controller CPU No. 3 (0x3E2), network
number 2 and station number 2 are specified for access, access is
made to the CPU
'.
The CPU number cannot be specified for the relay station.
Therefore, if access is made to the network No. 1 in the following
case, an error will occur since the network number controlled by the
CPU
is only "2".
MELSECNET/H
Personal
computer
Relay station Last access target
: QCPU (Q mode) No. 1
: QCPU (Q mode) No. 2
: QCPU (Q mode) No. 3
: QCPU (Q mode) No. 4
: MELSECNET/H module controlled by
(Network number: 1, station number: 1)
: MELSECNET/H module controlled by
(Network number: 2, station number: 1)
: MELSECNET/H module controlled by
(Network number: 2, station number: 2)