About The Standard Ram - Mitsubishi Electric MELSEC-Q Series User Manual

6 FILES HANDLED BY BASIC MODEL QCPU

6.5 About the Standard RAM

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(1) What is the standard RAM?
(a) The standard RAM is used when using file registers.
(b) The standard RAM data are backed up by the battery (Q6BAT) fitted to the
CPU module.
Even if ROM operation is to be performed with a program written to the
standard ROM, the battery is needed when the standard RAM is used by
the file registers.
(c) Be sure to format the program memory by GX Developer before using
Basic model QCPU. (However, Basic model QCPU automatically formats at
the time of PLC power off or reset, if it is in the initial state, or the battey
runs out to cause unstable memory.)
Refer to the GX Developer manual, for formatting by GX Developer.
(d) Data can be written onto the standard RAM by using the online function:
"Write to PLC."
(2) Stored Data
A standard RAM holds one file: file register file. Any other files cannot be written
onto a standard RAM.
MELSEC-Q
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