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Mitsubishi Electronics FX3G User Manual

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Page of 964
313
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 Series
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
FN
C30
-FN
C3
9
R
ota
tion and 
Shi
ft
12
FN
C40-FN
C49
D
ata O
perati
on
13
FNC
50-FNC
59
High-Speed
 
Proc
essing
14
FM
C60-FN
C69
H
andy 
In
struction
15
FN
C70-FN
C79
E
xternal
 F
X
 I/O
 
De
vice
16
FNC
80-FNC
89
External
 FX 
Dev
ice
17
FNC1
00-
FNC10
9
Dat
a 
Transfer 2
18
FNC1
10-
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
 
Operation 2
20
FNC1
50-
FNC159
Pos
itioning 
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
S1: This function is supported only in FX
3G
/FX
3GC
/FX
3U
/FX
3UC
 PLCs.
S2: This function is supported only in FX
3U
/FX
3UC
 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
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
S1
S2
S1
S2
n
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