314
FX3G/FX3U/FX3UC 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
S: This function is supported only in FX3U/FX3UC PLCs.
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 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 V Z Modify K H E ""P
3333333 S 3
3333333 S 33 3
n 33
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
S
n
Command
input
FNC 39
SFRDP
D
S
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