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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
33 Extension File Register Control – FNC290 to FNC299
33.1 FNC290 – LOADR / Load From ER
2) In FX3G/FX3GC PLCs
a) When a memory cassette is connected (A memory cassette can be connected only to FX
3G PLC.)
The contents (current values) of extension file registers (ER) stored in a memory cassette (EEPROM) with the
same numbers as the extension registers specified by to +n-1 are read, and
transferred to the extension registers specified by to +n-1 stored in the PLC's built-in RAM.
•Reading (transferring) is executed in device units. Up to 24,000 devices can be read (transferred).
b) When a memory cassette is not connected
In the program example below, the contents (current value) of extension file registers (ER) which are stored in
the EEPROM built in the PLC and have the same device numbers as extension registers to +n-
1 are read, and transferred to extension registers (R) which are stored in the RAM built in the PLC and have
the device numbers to +n-1.
•Reading (transferring) is executed in device units. Up to 24,000 devices can be read (transferred).
S
S
S
S
FNC290
LOADRP
S n
Command
input
E
E +1
E +2
E +3
E +n-2
E +n-1
+1
+2
+3
+n-2
+n-1
Read
(transfer)
Extension file registers (ER)
inside memory cassette
Extension registers (R)
inside built-in RAM
S
S
S
S
S S
S
S
S
S
S
S
S
S
S
S
FNC290
LOADRP
S n
Command
input
E
E +1
E +2
E +3
E +n-2
E +n-1
+1
+2
+3
+n-2
+n-1
Read
(transfer)
Extension file registers (ER)
inside built-in EEPROM
Extension registers (R)
inside built-in memory
S
S
S
S
S S
S
S
S
S
S
S