428
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
Program examples
In programs, the contents of buffer memories (BFMs) in special extension unit/blocks are read (transferred) to
data registers (D), extension registers (R) or auxiliary relays (M) with digit specification using an applied
instruction such as FROM, MOV and BMOV.
Example: When the BFM #4 (abnormal station information) in the CC-Link/LT master unit (whose unit number
is fixed to "0") built in the FX
3UC
-32MT-LT is read to D0
- In case of FROM instruction
- In case of MOVE instruction
Example: When the BFMs #0 to 3 (remote station connection information) in the CC-Link/LT master unit
(whose unit number is fixed to "0") built in the FX
3UC
-32MT-LT are read to D10 to D13
- In case of FROM instruction
- In case of BMOV instruction
M8000
Unit
No. 0
BFM #4
Storage
destination
Number of
transfer
points
FNC 78
FROM
K0
K4
D0
K1
M8000
Unit No. 0
BFM #4
Storage
destination
FNC 12
MOV
U0\G4
D0
M0
Unit
No. 0
BFM #0
Storage
destination
Number of
transfer
points
FNC 78
FROMP
K0
K0
D10
K4
M0
Unit No. 0
BFM #0
Storage
destination
FNC 15
BMOVP
U0\G0
D10
Number of
transfer
points
K4