Mitsubishi 00JCPU User Manual page 450

2) Checking timing
• In a program using any file register, check the file register size at step 0.
• After execution of the file register file switching instruction (QDRSET), check the file register size.
• Before executing the file register block switching instruction (RSET), confirm that space of 1K points or
more can be ensured after the switching.
3) 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.
SM400
M0 Transfer command
[Program example 2]
The file register range of use is checked after execution of the QDRSET instruction.
SM400
M0 Transfer command
9 - 75
(File register size) > [32K points
4K points specified
< SD647 K4
M0
< SD647 K4
M0
(Switching block No) + 1K points]
Final file register
M0
range check
Y0
Alarm processing
MOVP K4X20 R0
Writing to file
register
QDRSET "1:ABCD"
Changing file register to
ABCD of Drive 1
Final file register
M0
range check
Y0 Alarm processing
MOVP K4X20 R0
Writing to file
register