Mitsubishi Electric FX3G SERIES Programming Manual page 719

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
• Extension file registers are written in sector units (2048 points).
The table below shows the head device number in each sector:
Sector
Head device number
number
Sector 0 R0
Sector 1 R2048
Sector 2 R4096
Sector 3 R6144
Sector 4 R8192
Sector 5 R10240
Sector 6 R12288
Sector 7 R14336
• If "n" is set to "0", it is handled as "2048" when the instruction is executed.
• When writing (transfering) of 2,048 points is finished, execution of the instruction is completed and the instruction
execution complete flag M8029 turns ON.
• The number of already written points is stored in
2. Related device
Device number
Instruction execution
M8029
complete flag
Cautions
1. Cautions on writing data to a memory cassette
Memory cassettes use flash memory. Note the following when writing data to extension file registers in a memory
cassette with the FNC291 instruction.
• It takes about 340ms to write 2,048 points. If "n" is set to K0 or K2048, the operation cycle for executing this
instruction becomes longer than about 340ms.
If the operation cycle is severely affected, write data in two or more operation cycles.
When writing data in two or more operation cycles, set "n" ranging from K1 to K1024.
• Do not abort execution of this instruction in the middle of operation. If execution is aborted, unexpected data may
be written to extension file registers.
If execution of this instruction is aborted by turning OFF the power, execute the instruction again using step 2
described below after turning the power ON again.
Write
command
M
Instruction execution complete flag
M8029
Written device range
ER0 to ER2047
ER2048 to ER4095
ER4096 to ER6143
ER6144 to ER8191
ER8192 to ER10239
ER10240 to ER12287
ER12288 to ER14335
ER14336 to ER16383
→ For the instruction execution complete flag use method, refer to Subsection 6.5.2.
Name
When execution of the target instruction is completed, the instruction execution complete
flag M8029 turns ON.
In a program, however, there may be two or more instructions which use the flag M8029.
To avoid confusion, make sure to use the NO contact of this flag immediately under the
SAVER instruction so that this flag works only for the SAVER instruction.
SET
FNC295
S
INITERP
FNC291
S n
SAVER
RST
33 Extension File Register Control – FNC290 to FNC299
Sector
Head device number
number
Sector 8 R16384
Sector 9 R18432
Sector 10 R20480
Sector 11 R22528
Sector 12 R24576
Sector 13 R26624
Sector 14 R28672
Sector 15 R30720
D .
Description
M
n
D
M
33.2 FNC291 – SAVER / Save to ER
Written device range
ER16384 to ER18431
ER18432 to ER20479
ER20480 to ER22527
ER22528 to ER24575
ER24576 to ER26623
ER26624 to ER28671
ER28672 to ER30719
ER30720 to ER32767
31
32
33
34
35
36
37
38
A
B
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