User`s manual

Basics Specification comparison of CPU
2 – 10
2.2.5 Redundant CPU
It is not possible to connect an extension base unit to a main base unit with redundant CPU. The
expansion can be done by remote I/O station via MELSECNET/H network.
A standard main base unit of MELSEC System Q can be used, if you don’t need redundant
power supplies.
The redundant CPU modules Q12PRHCPU and Q25PRHCPU can’t be used with a multi-CPU
system.
Tab. 2-6: Specification comparison of Q12PRH and Q25PRH
Q12PRHCPU Q25HCPU
No. of I/O device points
(usable on program)
8192
No. of I/O device points
(Hex)
X/Y000 to 1FFF
No. of I/O points
(accessible to the actual
I/O module)
4096
No. of I/O device points
(Hex)
X/Y000 to FFF
SFC (MELSAP-3) Possible
Processing speed
(LD instruction)
34 ns
Processing speed
(MOV instruction)
102 ns
Data transfer time to the
Standby system
Device memory 48 k words: 10 ms
Device memory 100 k words: 15 ms
The cycle time increases by the data tranfer time to the Standby system.
Program memory
(Drive 0)
124 k steps 252 k steps
Standard RAM
(Drive 3)
256 kByte 256 kByte
Standard ROM
(Drive 4)
496 kByte 1008 kByte
Shared memory for multi-
CPU operation
—
Shared memory for high
speed data transfer in
multi-CPU operation
—
Memory cards RAM:
Q02MEM-1MBS (1 MB)
Q02MEM-2MBS (2 MB)
Flash card:
Q02MEM-2MBF (2 MB)
Q02MEM-4MBF (4 MB)
ATA ca rd:
Q02MEM-8MBA (8 MB)
Q02MEM-16MBA (16 MB)
Q02MEM-32MBA (32 MB)
Power consumption
(5 V DC)
0.64 A 0.64 A
Weight 0.3 kg 0.3 kg
Dimensions (HxWxD)
[mm]
98x52.2x89.3
NOTE
For more informations about redundant CPU modules refer to the technical catalogue
MELSEC System Q and to the User's Manual of the module.