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CHAPTER9 DEVICES
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9.7 File Register (R)
9.7.6 Precautions for using the file register
9 - 63
(c) File register size checking procedure
• Check the file register size used for each sequence program.
• Check the total file register size set in SD647 on the sequence program to see if there are sufficient
number of points to be used or not.
[Program example 1]
The file register range of use is checked at the beginning of each program.
[Program example 2]
The file register range of use is checked after execution of the QDRSET instruction.
[Program example 3]
When a block is switched to another:
(3) Deleting a file register file
To delete an unnecessary file register file, select [Online] [Delete PLC data] in GX Developer.
Figure 9.78 Program examples of file register checking
SM400
M0
Y0
M0
Transfer command
M0
MOVP K4X20 R0
<
SD647 K4
4K points specified
Final file register
range check
Writing to file
register
Alarm processing
SM400
M0
Y0
M0
Transfer command
M0
MOVP K4X20 R0
<
SD647 K4
QDRSET
"1:ABCD"
Final file register
range check
Changing file register to
ABCD of Drive 1
Writing to file
register
Alarm processing
SM400
M0
Y0
M0
Block switching
command
M0
RSET
K1
<
SD647 K33
Final file register
range check
Alarm processing
Switching to block 1