User`s manual

Memory capacity CPU modules
MELSEC System Q, Hardware 4 – 17
4.2 Memory capacity
A CPU of MELSEC System Q can access different memory devices, which differ in the drive
number. In addition to the internal memory (RAM and FlashROM) all CPU types (except
Q00(U)JCPU, Q00(U)CPU and Q01(U)CPU) have an extension slot for a memory card.
Depending on the type of memory card, the access to this slot is by drive 1 or drive 2.
The next pages show the memory capacities of the CPU modules.
BLOCKD~1
Fig. 4-1: Memory configuration of MELSEC System Q-CPU modules
Program memory
(Drive 0)
Memory card (ROM)
(Drive 2)
Standard ROM
(Drive 4
Memory card (RAM)
(Drive 1)
Standard RAM
(Drive 3)
CPU module
Memory card
The Basic model QCPU (Q00JCPU, Q00CPU,
Q01CPU), Q00U(J)CPU, Q01UCPU do not support
memory cards.
Unavailable for Q00JCPU
and Q00UJCPU