728
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
33 Extension File Register Control – FNC290 to FNC299
33.5 FNC294 – RWER / Rewrite to ER
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.
*1.
In some versions of GX Developer, "FX3UC" is
offered as the PLC type.
[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 complete, save the project.
*2.
In some versions of GX Developer, "FX3UC" is
offered as the PLC type.
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” (error code: K6706)
• 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)
FX3U(C)*1
FX3U(C)*2
