Mitsubishi MELSEC Q Series User Manual

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7.1 Memory of C Controller Module
7.1.1 User memory
7
MEMORIES AND FILES HANDLED BY C CONTROLLER
MODULE
CHAPTER7 MEMORIES AND FILES HANDLED BY C
CONTROLLER MODULE
This chapter explains the memories and file operations of the C Controller module and the
precautions for them.
7.1 Memory of C Controller Module
This section explains the user memories and system memory applicable to the C
Controller module.
7.1.1 User memory
Among the memories of the C Controller module, the user memories can be accessed by
the user program.
The following shows the user memories available for the C Controller module.
(1) User memories
(a) Standard ROM
The standard ROM stores the data (files), such as the parameters and user
programs of the C Controller module.
(b) Work RAM
The work RAM is a volatile memory where the user program of the C Controller
module is executed.
The user program stored in the standard ROM or CompactFlash card is read to
the work RAM and executed.
The OS and system software of the C Controller module are also read onto the
work RAM and executed.
(c) Battery-backed-up RAM
The battery-backed-up RAM is used to store the data that are to be retained in the
user program even after power-off.
The battery-backed-up RAM is accessed from the user program by the
QBF_WriteSRAM or QBF_ReadSRAM function.
(d) CompactFlash card
Installing a CompactFlash card to the CompactFlash card interface allows data
(file) reading and writing of the C Controller module.
Figure 7.1 User memories
Built in C Controller module
CompactFlash card
Install
Standard ROM
Work RAM
Battery-backed-up RAM
CPU shared memory ( )
Section 14.3

Mitsubishi MELSEC Q Series Specifications

General

Brand	Mitsubishi
Model	MELSEC Q Series
Category	Controller
Language	English