Fnc291 - Saver / Save To Er - Mitsubishi Electric MELSEC FX3U Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
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
arbitrary number of points. It is not necessary to execute INITR (FNC292) or INITER (FNC295) instruction
every time when RWER instruction is used.
1. Instruction format
FNC 291
SAVER
2. Set data
Operand Type
S
n
D
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S
n
D
Explanation of function and operation
1. 16-bit operation (SAVER)
The contents (current values) of extension registers (R) specified by
(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
Command
input
Instruction execution complete flag
M8029
758
Mnemonic
16-bit Instruction
SAVER
7 steps
⎯
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.)
Number of points written (transferred) in one operation cycle [0 ≤ n ≤ 2048]
Device number storing the number of already written points
Digit Specification
FNC291
n
S
SAVER
33 Extension File Register Control – FNC290 to FNC299
PLCs Ver.1.30 or later and FX
3UC
→ For RWER instruction, refer to Section 33.5.
Operation Condition
32-bit Instruction
Continuous
Operation
Description
Word Devices
Special
System User
Unit
D
Instruction execution complete
M
flag for SAVER instruction
33.2 FNC291 – SAVER / Save to ER
PLCs writes (transfers) only
3U
Mnemonic Operation Condition
⎯
⎯
16-bit binary
Others
Con- Real
Index
stant Number
V Z Modify K H E
to +2047 are written
S S
D
Data Type
Charac-
Pointer
ter String
" " P
.