User`s manual

System configuration Overall configuration
3 – 4
The following figure shows the system configuration of a redundant PLC with Q12PRH or
Q25PRH CPU types.
The redundant PLC of MELSEC System Q consists of two systems with identical configurations
(power supply, CPU module, network modules, etc.), which are connected by tracking cable.
One PLC controls the system, while the other one is in standby for reserve.
For more informations about configuration and applicable modules refer to the technical cata-
logue MELSEC System Q and to the User's Manual of the redundant PLC module.
Fig. 3-4: System configuration for Q12PRH- and Q25PRHCPU
NOTES Battery Q7BAT is not available in EU countries.
It is only possible to mount the redundant power supplies Q63RP and Q64RP on a main
base unit of type Q38RB and Q68RB. Each base unit has two slots for redundant power sup-
plies.
It is not possible to connect an extension base unit to a main base unit with a redundant
CPU up to serial no. 09012... The expansion can be done by remote I/O station via
MELSECNET/H network.
It is possible to connect up to maximum seven extension base units with totally 63 modules
with a redundant Q12PRHCPU or Q25PRHCPU beginning at serial no. 09012… In the first
stage the base unit Q65WRB should be connected directly to the main base unit. The base
units Q68RB should be used for the second to seventh stage.
MITSU BISHI
M
M
I
I
T
T
S
S
U
U
B
B
I
I
S
S
H
H
I
I
L
L
I
I
T
T
H
H
I
I
U
U
M
M
B
B
A
A
T
T
T
T
E
E
R
R
Y
Y
SRAM/Flash/ATA
Memory card
Battery
(Q6BAT)
Main base unit
(Q33B, Q35B, Q38B, Q38RB,
Q312B)
Power supply module, I/O mod-
ule and Special function module
of MELSEC System Q
Q12PRHCPU,
Q25PRHCPU
Q7BAT-SET
Battery
(Q7BAT)
Battery holder