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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
33 Extension File Register Control – FNC290 to FNC299
33.5 FNC294 – RWER / Rewrite to ER
2) In FX3G PLCs
a) When a memory cassette is connected
The contents (current values) of “n” extension registers (R) starting from are written (transferred) to extension
file registers having the same device numbers in a memory cassette (flash memory).
b) When a memory cassette is not connected
The contents (current values) of "n" extension registers (R) starting from are written (transferred) to
extension file registers which are stored in the EEPROM built in the PLC and have the same device numbers..
FNC290
RWERP
S n
Command
input
E
E +1
E +2
E +n-1
+1
+2
+n-1
*1
*1 All points specified by the instruction are written (transferred).
Write
(transfer)
Extension file registers (ER)
inside memory cassette
Extension registers (R) inside
built-in RAM memory
S
S
S
S
S
S
S
S
S
FNC290
RWERP
S n
Command
input
E
E +1
E +2
E +n-1
+1
+2
+n-1
*1
*1 All points specified by the instruction are written (transferred).
Write
(transfer)
Extension registers (R) inside
built-in RAM memory
S
S
S
S
S
S
S
S
Extension file registers (ER)
inside built-in EEPROM