290
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
11 Rotation and Shift Operation – FNC 30 to FNC 39
11.10 FNC 39 – SFRD / Shift Read [FIFO Control]
11.10 FNC 39 – SFRD / Shift Read [FIFO Control]
Outline
This instruction reads data for first-in first-out control.
1. Instruction format
2. Set data
*1.
"+1" is required for the pointer.
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (SFRD and SFRDP)
+1 written in turn by SFWR (FNC 38) instruction is transferred (read) to
, and "n-1" words from
+1 are shifted rightward by 1 word. "1" is subtracted from the number of data stored in
.
Operand Type
Description
Data Type
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
Word device number storing data taken out first 2
≤
n
≤
512
16-bit binary
n
Number of stored data 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
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
3
3 3 3 3
3
3
3
3
3
3 3 3 3
3
3 3
3
n
3 3
P
FNC 39
SFRD
16-bit Instruction
7 steps
Mnemonic
Operation Condition
Continuous
Operation
Pulse (Single)
Operation
SFRD
SFRDP
−
−
Mnemonic
Operation Condition
32-bit Instruction
S
S
D
S
D
S
1
D
S
1
D
n
Command
input
FNC 39
SFRDP
D
S