429
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
15.9.1
Common items between FROM instruction and TO instruction (details)
Contents specified by operands
1. Unit number "m1" of a special extension unit/block
Use the unit number to specify which equipment FROM/TO instruction works for.
Setting range: K0 to K7
A unit number is automatically assigned to each special extension unit/block connected to a PLC.
The unit number is assigned in the way "No. 0
→
No. 1
→
No. 2 ..." starting from the equipment nearest to the
main unit.
2. Buffer memory (BFM) number "m2"
Up to 32767 16-bit RAM memories are built into a special extension unit/block, and they are called buffer
memories.
Buffer memory numbers range from "0" to "32766" and their contents vary depending on the function of the
extension equipment.
Setting range: K0 to K32766
• When BFMs are handled in a 32-bit instruction, a specified BFM stores low-order 16 bits, and a
consecutive BFM stores high-order 16-bits.
3. Number of transfer points "n"
Setting range: K1 to K32767
Specify the number of transferred word devices in "n".
"n =2" in a 16-bit instruction indicates the same meaning with "n = 1" in a 32-bit instruction.
FX
3UC
-
32MT-
LT main
unit
Unit
No. 0
Built-in
CC-Link/LT
I/O
extension
block
Special
extension
block
Special
extension
block
Special
extension
block
I/O
extension
block
Unit
No.1
Unit
No.2
Unit
No.3
BFM #10
BFM #9
Low-order
16 bits
High-order
16 bits
←
Specified BFM number
D100
D101
D102
D103
D104
BFM #5
#6
#7
#8
#9
Specified devices
Specified BFMs
D100
D101
D102
D103
BFM #5
#6
#7
#8
Specified devices
Specified BFMs
In the case of "n = 5" in a 16-bit
instruction
In the case of "n = 2" in a 32-bit
instruction