304
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
11 Rotation and Shift Operation – FNC 30 to FNC 39
11.9 FNC 38 – SFWR / Shift Write [FIFO/FILO Control]
11.9 FNC 38 – SFWR / Shift Write [FIFO/FILO Control]
Outline
This instruction writes data for first-in first-out (FIFO) and last-in first-out (LIFO) control.
1. Instruction format
2. Set data
*1. "+1" is required for the pointer.
3. Applicable devices
S: This function is supported only in FX3U/FX3UC PLCs.
Operand Type Description Data Type
Word device number storing data to be put in first 16-bit binary
Head word device number storing data (The first word device works as the pointer, and
data is stored in +1 and later)
16-bit binary
n
Number of store points plus "1"
*1
2 n 512
16-bit binary
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 VZModifyKH E ""P
33333333 S 33 3 33
3333333 S 3
n 33
16-bit Instruction
7 steps
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
SFWR
SFWRP
−
−
Mnemonic Operation Condition
32-bit Instruction
P
FNC 38
SFWR
S
D
D
S
D
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