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FX3S/FX3G/FX3GC/FX3U/FX3UC 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
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High-Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
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
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.
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
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.
FX3UC-
32MT-
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
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