697
FX
3U
/FX
3UC
Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
31 Data Transfer 3 – FNC275 to FNC279
31.1 FNC278 – RBFM / Divided BFM Read
31
FN
C
275-FN
C
279
Da
ta
Tr
ans
fe
r 3
32
FN
C
280
-F
N
C
28
9
H
igh Speed
Pr
oces
si
ng 2
33
FN
C
290-FN
C
299
Ext
ensi
on Fi
le
R
egi
st
er
34
SF
C
•S
T
L
Pr
o
g
ra
m
m
in
g
35
In
te
rru
p
t
Funct
ion
36
Sp
e
cia
l De
vic
e
37
E
rro
r C
o
d
e
A
V
e
rs
ion U
p
In
fo
rm
a
tio
n
B
Ex
ec
ut
ion Ti
m
e
s
C
Appl
ic
ab
le
In
st
ru
ct
ion Li
st
• Do not stop the driving of the instruction while it is being executed. If driving is stopped, the buffer memory
(BFM) reading/writing processing is suspended, but the data acquired in the middle of reading/writing
processing is stored in
and later and buffer memories (BFM).
• When indexing is executed, the contents of index registers at the begining of execution are used.
Even if the contents of index registers are changed after the instruction, such changes do not affect the
process of the instruction.
• The contents of "n1" devices starting from
change while RBFM (FNC278) instruction is executed.
After execution of the instruction is completed, execute another instruction for "n1" devices starting from
.
• Do not update (change) the contents of "n1" devices starting from
while WBFM (FNC279) instruction
is executed. If the contents are updated, the intended data may not be written to the buffer memories
(BFM).
• Do not update (change) the contents of "n1" buffer memories (BFM) starting from the buffer memory No.
"m2" while RBFM (FNC278) instruction is executed. If the contents are updated, the intended data may
not be read.
D
Command
input
M
{{
SET
M
{{
M8029
RST
M
{{
Instruction execution complete
FNC278
RBFM
m1
m2
D
n1
n2
D
D
S
