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6 HIGH PERFORMANCE MODEL QCPU FILES
6.4 About the Standard RAM
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(1) What is the standard RAM?
(a)
The standard RAM is used when using file registers or local devices without
a memory card being mounted on the High Performance model QCPU.
(b)
The standard ROM must be formatted by using GX Developer when using
the High Performance module QCPU for the first time. Refer to the GX
Developer manual for details on the formatting method.
(c)
Data can be written into the standard RAM by using the online function:
"Write to PLC."
(2) Stored Data
A standard RAM holds two files: file register file and local device file. Any other
files cannot be written into a standard RAM.
(3) Format
(a)
Formatting
To format a standard RAM, choose "Online"
then select "Standard RAM" in the "Target memory" list box. See Section
6.2 for the PLC Memory Format dialog box.
(b)
Memory capacity after formatted
Table 6.3 shows the memory capacity of a "formatted" standard RAM.
CPU Type Serial No.
Q02CPU
—
"04011"
or earlier
Q02HCPU
"04012"
or later
"04011"
or earlier
Q06HCPU
"04012"
or later
"02091"
or earlier
Q12HCPU
"02092"
or later
"02091"
or earlier
Q25HCPU
"02092"
or later
Table 6.3 Memory Capacity
Number of Files Stored
32 k words (64 kbytes)
32 k words (64 kbytes)
64 k words (128 kbytes)
32 k words (64 kbytes)
64 k words (128 kbytes)
32 k words (64 kbytes)
128 k words
(256 kbytes)
32 k words (64 kbytes)
128 k words
(256 kbytes)
MELSEC-Q
"Format PLC memory" and
Number of Files Stored
File Register Local Device
1
1
1
1
1
1
1
1
1
1
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