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MELSEC-Q
6 HIGH PERFORMANCE MODEL QCPU FILES
6.3 About the Standard ROM
(1) What is the standard ROM?
(a) The standard ROM is used for the ROM operation of the High Performance
model QCPU.
(b) Programs stored in the standard ROM can be used after being read
(boosted) to the program memory in accordance with the setting made at
the "Boot file" tab screen in the “(PLC) Parameter" dialog box.
(c) The standard ROM does not need formatting.
(d) Writing into standard ROMs is performed with the GX Developer's on-line
"PLC Writing" (flash ROM) of "Create Program Memory ROM" (see Section
6.6.1.) It is also possible to write in a standard ROM from the memory card
with "Automatic writing in the standard ROM" without using GX Developer.
POINTS
(1) Before writing data to a standard ROM, all previous data stored in the standard
ROM are erased. Therefore, all data stored in a standard ROM must be read
out and copied into the program memory at first. There, read through and
modify it as necessary. Then, write the modified data back into a standard
ROM at a time. Please note that an error may occur if data stored in the
standard ROM is used in a sequence program, with data being written in the
standard ROM.
(2) For details on the formatting procedure by GX Developer, refer to GX
Developer manuals.
(3) Programs are stored in the standard ROM in 1 k step units.
(2) Data Storage
A standard ROM stores data such as parameters and programs.
See Section 6.1 for the data to store in the standard ROM.
(3) Memory Capacity
Table 6.2 shows the memory capacity of standard ROMs.
Table 6.2 Memory Capacity
Model Name
Memory Capacity
2
Max. Number of Files Stored
Q02CPU
28 k steps (114688 bytes)
28 files
Q02HCPU
28 k steps (114688 bytes)
28 files
Q06HCPU
60 k steps (245760 bytes)
60 files
Q12HCPU
124 k steps (507904 bytes)
124 files
Q25HCPU
252 k steps (1032192 bytes)
252 files
REMARK
In computing a memory capacity, 1 step is equal to 4 bytes.
Содержание QCPU (Q Mode)
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