Mitsubishi Electric MELSEC FX3U Programming Manual page 781

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Cautions
1. Cautions on writing data to a memory cassette (flash memory) for FX
Memory cassettes adopt flash memory. Note the following contents when writing data to extension file
registers in a memory cassette with the FNC294 instruction.
• Though extension file registers to be written can be specified arbitrarily, writing is executed in units of
sector.
It takes about 47 ms to write one sector. If the extension file registers to be written are located in two
sectors, the instruction execution time will be about 94 ms.
Make sure to change the set value of the watchdog timer D8000 before executing this instruction.
Writing command input
M100
The table below shows the head device number in each sector:
Sector number
Sector 0
Sector 1
Sector 2
Sector 3
Sector 4
Sector 5
Sector 6
Sector 7
• Do not turn OFF the power while this instruction is being executed. If the power is turned OFF, execution
of this instruction may be aborted. If execution is aborted, the data may be lost. Make sure to back up the
data before executing this instruction.
2. Cautions on writing data to a memory cassette (EEPROM) for FX
Memory cassettes adopt the EEPROM. Note the following contents when writing data to extension file
registers in a memory cassette using the FNC294 instruction.
• Do not turn OFF the power while this instruction is being executed. If the power is turned OFF, execution of
this instruction may be aborted. If execution is aborted, the data may be lost. Make sure to back up the
data before executing this instruction.
PLS
FNC 12
D8000
MOV
FNC 20
D8000 K47 *1
ADD
FNC294
R1000
RWER
D200
MOV
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
33 Extension File Register Control – FNC290 to FNC299
M100
D200
D8000 *1 Number of sectors to be written × 47 ms
FNC 07
WDT
The contents of R1000 to R1099 in the sector 0 are
K100
written to ER1000 to ER1099.
D8000
FNC 07
WDT
Sector number
Sector 8
Sector 9
Sector 10
Sector 11
Sector 12
Sector 13
Sector 14
Sector 15
→ For the backup method, refer to the next page.
→ For the backup method, refer to the next page.
33.5 FNC294 – RWER / Rewrite to ER
/FX PLCs
3U
3UC
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
PLCs
3G
31
32
33
34
35
36
37
38
A
B
779