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FX3S/FX3G/FX3GC/FX3U/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
33 Extension File Register Control – FNC290 to FNC299
33.5 FNC294 – RWER / Rewrite to ER
31
FNC277-FNC279
Data
Transfer 3
32
FNC280-FNC289
High-Speed
Processing 2
33
FNC290-FNC299
Extension File
Register Control
34
FNC300-FNC305
FX
3U
-CF-ADP
35
SFC•STL
Programming
36
Interrupt
Function
37
Special Device
38
Error Code
A
Version Up
Information
B
Execution Times
33.5 FNC294 – RWER / Rewrite to ER
Outline
This instruction writes the current values of an arbitrary number of extension registers (R) stored in the RAM in the
PLC to extension file registers (ER) stored in a memory cassette (flash memory or EEPROM) or the EEPROM built
into the PLC.
Because RWER (FNC294) instruction is not supported in FX
3UC PLC before Ver. 1.30, use the SAVER (FNC291)
instruction instead.
→ For the SAVER (FNC291) instruction, refer to Section 33.2.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (RWER)
1) In FX3U/FX3UC PLCs
The contents (current values) of “n” extension registers (R) starting from are written (transferred) to
extension file registers with the same device numbers in a memory cassette (flash memory).
*1. All points specified by the instruction are written (transferred).
• When “n” is set to “0”, it is handled as “32768” when the instruction is executed.
Operand Type Description Data Type
Device number of extension register storing data
16-bit binary
n
Number of devices
[FX3G/FX3GC: 1 ≤ n ≤ 24000, FX3U/FX3UC: 0 ≤ n ≤ 32767] to be written (transferred)
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD
.b KnX KnY KnM KnS T C D R
U\G
V Z Modify K H E "
"P
n
P
FNC 294
RWER
Mnemonic Operation Condition
16-bit Instruction
5 steps
RWER
Mnemonic Operation Condition
Continuous
Operation
32-bit Instruction
⎯
⎯
RWERP
Pulse (Single)
Operation
S
S
S
FNC294
RWERP
n
S
Command
input
E
E +1
E +2
E +n-1
+1
+2
+n-1
*1
Write
(transfer)
Extension file registers (ER)
inside memory cassette
Extension registers (R) inside
built-in RAM
S
S
S
S
S
S
S
S