Program Memory - Mitsubishi Electric MELSEC-Q Series User Manual

6 FILES HANDLED BY BASIC MODEL QCPU

6.2 Program Memory

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(1) What is the Program Memory?
(a) The program memory is an internal RAM that stores program executed by
the Basic model QCPU.
(b) The data storage in the program memory is backed up by Basic model
QCPU's built-in battery (Q6BAT).
(c) Before using the Basic model QCPU, always format the memory using GX
Developer.
(However, if the memory is in an initial status or has been unformatted due
to battery (Q6BAT) exhaustion, the Basic model QCPU does formatting
automatically at power-on or reset of the PLC.
For details regarding the formatting procedure by the GX Developer, refer
to GX Developer manuals.
Table 6.1 Memory capacity after formatting
Model Name
Q00JCPU
Q00CPU
Q01CPU
POINT
Program is stored in the program memory in 4 bytes units.
(2) Data Storage
Data on parameter and program can be stored in the program memory. For the
types of data stored in the program memory, see Section 6.1.
REMARK
1: The program memory is formatted by GX Developer when the user setting area
in the system area is assigned. (0-3k steps can be set to the user setting area
of the system area in 1k step increments.)
The user setting area (data) in the system area is used for registering monitor
data from GX Developer connected to serial communication module.
The allocation of space for the user setting area will make it much easier to
perform monitoring with GX Developer connected to the serial communications
module.
Although the designation of a user setting area speeds up monitoring from GX
Developer connected to serial communication module, it also reduces the
amount of space available for user files.
1
Memory
58 kbyte
94 kbyte
94 kbyte
MELSEC-Q
1
Max. Number of Program Stored
1
1
1
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