Mitsubishi Electronics FX3G User Manual
451
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
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
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
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
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
The unit number is assigned in the way "No. 0
→ No. 1 → No. 2 ..." starting from the equipment nearest to the main
unit.
When the main unit is the FX
When the main unit is the FX
3UC
-32MT-LT(-2), the unit number is assigned in the way "No. 1
→ No. 2 → No. 3 ..."
starting from the equipment nearest to the main unit because the CC-Link/LT master is built into the FX
3UC
-32MT-LT
(-2).
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
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.
"n =2" in a 16-bit instruction indicates the same meaning with "n = 1" in a 32-bit instruction.
FX
3UC
-
32MT-
LT(-2)
main unit
LT(-2)
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
D101
D102
D103
D104
BFM#5
#6
#7
#8
#9
#7
#8
#9
Specified devices
Specified BFMs
D100
D101
D102
D103
D101
D102
D103
BFM#5
#6
#7
#8
#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