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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
Program examples
In programs, the contents of buffer memories (BFMs) in special extension units/blocks are read (transferred) to data
registers (D), extension registers (R) and auxiliary relays (M) with digit specification using the FROM instruction and
direct specification of buffer memories
*1
.
*1. This function is supported only in FX
3U/FX3UC PLCs.
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(-2) is read to D0
-In case of FROM instruction
-In case of MOV 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(-2) are read to D10 to D13
-In case of FROM instruction
-In case of BMOV instruction
M8000
Unit
No. 0
BFM#4
Transfer
destination
Number o
f
transfer
points
FNC 78
FROM
K0 K4 D0 K1
M8000
Unit No. 0
BFM#4
Transfer
destination
FNC 12
MOV
U0\G4 D0
M0
Unit
No. 0
BFM#0
Transfer
destination
Number o
f
transfer
points
FNC 78
FROMP
K0 K0 D10 K4
M0
Unit No. 0
BFM#0
Transfer
destination
FNC 15
BMOVP
U0\G0 D10
Number o
f
transfer
points
K4