427
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
15 External FX I/O Device – FNC 70 to FNC 79
15.9 FNC 78 – FROM / Read From A Special Function Block
11
FN
C30-
FN
C39
R
o
ta
tion and
Sh
ift
12
FNC
4
0
-FNC49
D
a
ta
Op
e
ra
tio
n
13
FNC5
0
-FNC5
9
H
igh Speed
Pr
ocessi
ng
14
FM
C6
0
-F
NC6
9
H
and
y
In
st
ru
cti
o
n
15
FNC7
0
-FNC7
9
Ex
te
rn
a
l F
X
I
/O
D
evi
ce
16
FNC8
0
-FNC8
9
Ext
e
rnal
FX
D
evi
ce
17
F
N
C1
00
-F
NC
10
9
Da
ta
Tr
ansf
e
r 2
18
FN
C
110-FN
C
13
9
Fl
oat
ing P
o
in
t
19
FN
C
140-FN
C
149
Da
ta
O
per
at
io
n
2
20
FN
C
15
0-F
N
C
159
P
o
si
tioni
ng
C
ont
ro
l
2. 32-bit operation (DFROM and DFROMP)
Special extension unit/block (BFM)
→
PLC (word device)
"n" 32-bit data starting from the buffer memory (BFM) # [m2+1, m2] inside a special extension unit/block No.
m1 are transferred (read) to "n" devices starting from [
+1,
] inside a PLC.
Related devices
Cautions
1. Digit specification in bit device
For the 16-bit operation instruction, specify K1 to K4. For the 32-bit operation instruction, specify K1 to K8.
Device
Name
Description
M8028
Enable interrupt flag
Disables or enables interrupts while FROM/TO instruction is executed.
→
For the details, refer to "Acceptance of interrupts while FROM/TO instruction
is executed (M8028)" on the next page.
OFF: Disables interrupts.
(Interrupts are executed after FROM/TO instruction is executed.)
ON:
Enables interrupts.
D
D
Command
input
FNC 78
DFROM
m1
m2
n
D
Unit No.
m1 = 0 to 7
Transfer source BFM #
m2 = 0 to 32765
Transfer destination
Number of transfer points
n = 1 to 16383
D