Mitsubishi Electronics Mitsubishi Digital Electronics Video Gaming Accessories FX3G ユーザーズマニュアル
697
FX
3G
/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
-F
-F
N
C
27
9
Da
ta
Trans
fe
fe
r 3
32
FN
C
280-
FN
FN
C
289
H
igh Speed
Pr
ocessing 2
33
FN
C
290-
FN
FN
C
299
E
xtension Fi
le
R
egister
34
FN
C
300-
FN
FN
C
30
5
FX
3U
-C
F-A
D
P
35
SFC•
STL
Pr
ogr
am
m
am
m
ing
36
In
ter
rupt
Funct
ion
37
S
pecial
D
evice
38
Er
ro
r C
ode
A
Ve
rs
ion U
p
In
fo
rm
atio
n
B
Executi
on
T
im
es
Related devices
→ For the flag use methods for instruction execution complete and instruction execution
abnormally complete, refer to Subsection 6.5.2.
Related instructions
Errors
An operation error is caused in the following case; The error flag M8067 turns ON, and the error code is stored in
D8067.
• When the unit number "m1" does not exist (error code: K6708)
D8067.
• When the unit number "m1" does not exist (error code: K6708)
31.1.1 Common items between RBFM (FNC278) instruction and WBFM (FNC279) instruction
Specification of unit number of special function block/unit and buffer memory
→ For the connection method of special extension units/blocks,
number of connectable units/blocks, and handling of I/O numbers,
refer to the manual of the PLC used and special function block/unit.
1. Unit number "m1" of a special extension unit/block
Use the unit number to specify to which equipment the RBFM/WBFM instruction works.
Setting range: K0 to K7
Setting range: K0 to K7
A unit number is automatically assigned to each special extension unit/block connected to the PLC.
The unit number is assigned in the way "No. 0
The unit number is assigned in the way "No. 0
→ No. 1 → No. 2 ..." starting from the equipment nearest 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 in a special extension unit/block, and they are called buffer memories.
The buffer memory number is from "0" to "32766", and the contents are determined according to each special function
unit/block.
Setting range: K0 to K32766
The buffer memory number is from "0" to "32766", and the contents are determined according to each special function
unit/block.
Setting range: K0 to K32766
→ For the contents of buffer memories, refer to the manual of the special function block/unit used.
Device
Name
Description
M8029
Instruction execution complete
Turns ON when an instruction is finished normally.
M8328
Instruction non-execution
Turns ON when RBFM (FNC278) or WBFM (FNC279) instruction in
another step is executed for the same unit number.
another step is executed for the same unit number.
M8329
Instruction execution abnormally complete
Turns ON when an instruction is finished abnormally.
Instruction
Description
FROM(FNC 78)
Read from a special function block
TO(FNC 79)
Write to a special function block
WBFM(FNC279)
Divided BFM write
FX
3UC
-
32MT-LT
(-2)
main unit
(-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