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MELSEC-Q
10 DEVICES
10.7.1 File register capacity
(1) Using the Standard RAM
A maximum of 32 k file register points can be stored in the standard RAM. The
standard RAM holds file registers and local devices. When local devices are not
used, all 32 k points can be assigned for file registers.
(2) Using the SRAM Card
The size of a file can be expanded at the rate of 32 k words per block, up to 32
blocks, 1017 k words. The number of expandable blocks depends on the size of
programs or device comments stored on a memory card.
(3) Using the Flash Card
The size of a file can be expanded at the rate of 32 k words per block up to 32
blocks, 1018 k words. The number of expandable blocks depends on the size of
programs or device comments stored on a memory card.
REMARK
For details regarding the High Performance model QCPU memory cards, see
Section 6.1.
10.7.2 Differences in memory card access method by memory card type
File registers are stored in three types of memories: standard RAM, SRAM card, and
Flash card.
Note that the file register access method differs depending on the memory type.
How to Access
Standard
RAM
SRAM
Card
Flash
Card
Read with a user's program
Write with a user's program
PLC read through the device setting
PLC write through the device setting
Online test operation from GX Developer
PLC write from GX Developer
PLC write from GX Developer (Flash ROM)
Batch write from serial communication module
Device write from GOT900 Series
How to Modify the
Stored Data
Random write command from GOT 900 Series
