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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
4 Devices in Detail
4.10 Extension Register [R] and Extension File Register [ER]
•In FX3G PLCs
Data can be written to the memory cassette (EEPROM) up to 10,000 times, and to the built-in memory
(EEPROM) up to 20,000 times.
Every time the RWER (FNC294) instruction is executed, it is counted as a write to the memory. Make sure
not to exceed the allowable number of writes.
When a continuous operation type instruction is used, data is written to the memory in every operation
cycle of the PLC. For preventing this, make sure to use a pulse operation type instruction.
Execution of the LOADR (FNC290)instruction is not counted as a write to the memory.
4.10.8 Registration of data in extension registers and extension file registers
This subsection explains the operating procedures of GX Developer (Ver.8.72A or later).
→ For details on GX Developer operating procedures, refer to the GX Developer manual.
1 Starting up GX Developer (GPPW)
Click [Start]-[All Programs]-[MELSOFT Application]-[GX Developer] in Microsoft Windows.
2 Setting the PLC model
Set the PLC Series and PLC type as shown below.
*1. For Ver. 8.13P to 8.24A of GX Developer, the PLC type is FX3UC.
Essential set item Contents of setting
PLC series FXCPU
PLC Type
FX3U(C)
*1
, FX3G
*1
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