Mitsubishi Electric MELSEC FX3U Programming Manual page 783

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
Data backup method
When the contents of extension file registers (ER) and extension registers (R) should not be lost, back up the
current values (data) of extension file registers (ER) and extension registers (R) in advance using the
following procedure:
1) Set the PLC mode to STOP.
2) Create a new project in GX Developer.
This step is not necessary if it is alright to overwrite the current project.
3) Read the contents of extension file registers (ER) and extension registers (R) to GX Developer.
[1]Select "Online" → "Read from PLC..." to
display the "Read from PLC" window.
[2]Click "Parameter" and "Device data" to put a
check mark next to each of them.
[3]Select "Ext. file register" and "Ext. register"
on the "Device data" tab. In GX Developer
former than Ver.8.18U, the extension file
register range cannot be set.
[4]Click [Execute] button to execute reading.
[5]When reading is completed, save the
project.
Errors
An operation error is caused in the following cases; The error flag M8067 turns ON, and the error code is
stored in D8067.
• When the last device number to be transferred exceeds "32767
At this time, data is read (and transferred) until the last device number R32767
• When a memory cassette is not connected (error code: K6771)
• When the protect switch of the memory cassette is set to ON (error code: K6770)
*1. The last device number is 23999 in FX
*2. An operation error is not caused in FX
in the EEPROM built into the PLC are read if a memory cassette is not connected.
33 Extension File Register Control – FNC290 to FNC299
*1.For Ver. 8.13P to 8.24A of GX Developer, the PLC
type is FX .
3UC
*2.For Ver. 8.13P to 8.24A of GX Developer, the PLC
type is FX .
3UC
*1
" (error code: K6706)
*2
PLCs.
3G
PLCs because the contents of extension file registers stored
3G
33.5 FNC294 – RWER / Rewrite to ER
FX3U(C)*1
FX3U(C)*2
*1
.
31
32
33
34
35
36
37
38
A
B
781