Common Items Between From Instruction And To Instruction (Details) - Mitsubishi FX3U Series Programming Manual

FX /FX Series Programmable Controllers
3U 3UC
Programming Manual - Basic & Applied Instruction Edition

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
Unit
No. 0
Built-in
CC-Link/LT
FX -
3UC
I/O
32MT-
extension
LT main
block
unit
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.
High-order
16 bits
BFM #10
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.
Specified devices
D100
D101
D102
D103
D104
In the case of "n = 5" in a 16-bit
Unit Unit
No.1 No.2
Special Special
extension extension
block block
Low-order
16 bits
← Specified BFM number
BFM #9
Specified BFMs
BFM #5
#6
#7
#8
#9
instruction
15 External FX I/O Device – FNC 70 to FNC 79
15.9 FNC 78 – FROM / Read From A Special Function Block
Unit
No.3
I/O Special
extension extension
block block
Specified devices
D100
D101
D102
D103
In the case of "n = 2" in a 32-bit
instruction
Specified BFMs
BFM #5
#6
#7
#8
11
12
13
14
15
16
17
18
19
20
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