710
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
33 Extension File Register Control – FNC290 to FNC299
33.2 FNC291 – SAVER / Save to ER
33.2
FNC291 – SAVER / Save to ER
Outline
This instruction writes the current values of extension registers (R) stored in the PLC's built-in RAM to
extension file registers (ER) stored in a memory cassette (flash memory) in units of sector (2048 points).
RWER (FNC294) instruction provided in FX
3UC
PLCs Ver.1.30 or later and FX
3U
PLCs writes (transfers) only
arbitrary number of points. It is not necessary to execute INITR (FNC292) or INITER (FNC295) instruction
every time when RWER instruction is used.
→
For RWER instruction, refer to Section 33.5.
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (SAVER)
The contents (current values) of extension registers (R) specified by
to
+2047 are written
(transferred) to extension file registers (ER) inside a memory cassette (flash memory) having the same
device numbers in “2048/n” operation cycles (“2048/n+1” cycles if there is the remainder).
While the instruction is being executed, the number of already written points is stored in
.
Operand Type
Description
Data Type
Device number of extension register to which data is to be written
(Only the head device number of a sector of extension registers can be
specified.)
16-bit binary
n
Number of points written (transferred) in one operation cycle [0
≤
n
≤
2048]
Device number storing the number of already written points
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
X Y M T C S D
.b KnX KnY KnM KnS
T
C
D
R U
\G
V
Z Modify K
H
E
"
"
P
3
3
n
3 3
3
3
FNC 291
SAVER
Mnemonic
Operation Condition
16-bit Instruction
7 steps
SAVER
Mnemonic
Operation Condition
Continuous
Operation
32-bit Instruction
⎯
⎯
⎯
S
D
S
D
S
S
D
FNC291
SAVER
n
M
{{
M8029
Instruction execution complete flag
Instruction execution complete
flag for SAVER instruction
Command
input
S
D