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FX
3G
/FX
3U
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3UC
Series Programmable Controllers
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
FN
C
C
30
-FN
C
C
39
R
otati
on and
on and
Shi
ft
ft
12
FNC4
0-F
0-F
NC4
9
D
ata O
per
ati
per
ati
on
13
FN
C
C
50-FN
C
59
H
igh S
pe
ed
P
rocessing
14
FM
C
C
60-FN
C
69
H
andy
In
st
ru
ct
ion
15
FNC7
0-F
0-F
NC7
9
Ex
ter
nal FX
I/O
D
evice
16
FN
C
C
80-FN
C
89
Ext
ernal
FX
ernal
FX
De
vic
vic
e
17
FN
C
100-
FN
FN
C
10
9
Da
ta
Transf
er 2
er 2
18
FN
C
110-
FN
FN
C
139
Floati
ng Poi
nt
19
FN
C
14
0-F
N
C
149
Da
ta
O
per
at
at
ion 2
20
FN
C
150-
FN
FN
C
159
Posit
ioning
C
ont
ro
ro
l
Explanation of function and operation
1. 16-bit operation (SFWR and SFWRP)
The contents of
are written to "n-1" devices from
+1, and "1" is added to the number of data stored in
.
For example, when
= 0, the contents of
are written to
+1. When
= 1, the contents of
are written to
+2.
1) When X000 turns ON from OFF, the contents of
are stored to
+1. So the contents of
+1
become equivalent to
.
2) When the contents of
are changed and then the command input is set to ON from OFF again, the new
contents of
are stored to
+2. So the contents of
+2 become equivalent to
. (When the
continuous operation type SFWR instruction is used, the contents are stored in each operation cycle. Use the
pulse operation type SFWRP instruction in programming.)
pulse operation type SFWRP instruction in programming.)
3) Data are stored from the right end in the same way, and the number of stored data is specified by the contents of
the pointer
.
Related device
→ For the carry flag use method, refer to Subsection 6.5.2.
Related instructions
Caution
1. In the case of continuous operation type (SFWR) instruction
Note that data are stored (overwritten) in each scan time (operation cycle).
Device
Name
Description
M8022
Carry
When the contents of the pointer
exceeds "n-1", no operation is executed (so data is not written)
and the carry flag M8022 turns ON.
Instruction
Description
SFRD (FNC 39)
Shift read (for FIFO control)
POP (FNC212)
Shift last data read (for FILO control)
S
D
D
D
S
D
D
S
D
n
Command
input
FNC 38
SFWRP
SFWRP
D
S
Before
execution
After
execution
D
D+n
...
D+2
D+10 D+9 D+8 D+7 D+6 D+5 D+4 D+3
D+1
n
S
D
D+n
...
D+2
D+10 D+9 D+8 D+7 D+6 D+5 D+4 D+3
S
D
D+n
...
S
D+10 D+9 D+8 D+7 D+6 D+5 D+4 D+3
S
+1
→
D +1
→
Executed at the 2nd time
(K1)
(K0)
(K2)
(K1)
Executed at the 1st time
( = 0)
( = 0)
D
Pointer
Pointer
Pointer
S
D
D
D
S
S
D
D
S
S
S
D
D
S
D
D