Справочник Пользователя для Mitsubishi Electronics FXCPU
14 Applied Instructions (External FX I/O Device)
14.9 FROM / Read From A Special Function Block
381
FXCPU Structured Programming Manual
[Basic & Applied Instruction]
11
Appl
ied
ied
In
stru
cti
cti
ons
(D
ata O
per
at
io
n)
12
Ap
plied
Instru
ctio
ns
Instru
ctio
ns
(High S
peed
Process
ing)
13
App
lied Instr
lied Instr
ucti
ons
(Handy
Instruction)
14
Ap
pl
ied In
struct
struct
ions
(External FX I/O
D
evice)
15
Appl
ied
ied
Instru
cti
cti
ons
(External
Dev
ice
ice
(op
tional
dev
ice)
)
tional
dev
ice)
)
16
App
lie
lie
d Instr
uction
s
s
(E
xter
nal
nal
Devi
ce)
17
Ap
pl
ied Inst
ruct
io
io
ns
(Dat
a T
ransf
er 2)
a T
ransf
er 2)
18
Appl
ied
ied
In
stru
cti
cti
ons
(Float
ing P
oin
oin
t)
19
App
lie
lie
d Instr
uction
s
s
(D
at
a Oper
at
ion 2)
20
App
lied Inst
lied Inst
ructi
ons
ons
(Pos
itioning
Control)
14.9
FROM / Read From A Special Function Block
Outline
This instruction reads out the content of buffer memory (BFM) of special extension unit/block to the PLC.
If a large quantity of buffer memory (BFM) data is read out in batch by using this instruction, a watchdog timer
error may occur. When there is no bad influence for the control if the data is divided and read out, you can use
RBFM instruction.
If a large quantity of buffer memory (BFM) data is read out in batch by using this instruction, a watchdog timer
error may occur. When there is no bad influence for the control if the data is divided and read out, you can use
RBFM instruction.
1. Format and operation, execution form
2. Set data
*1.
In the case of FX
1N
, FX
1NC
, FX
U
, FX
2C
, FX
2N
, FX
2NC
series, the data type of DFROM, DFROMP of
32-bit operation is ANY16.
FX
3U(C)
FX
3G(C)
FX
3S
FX
2N(C)
FX
1N(C)
FX
1S
FX
U
/FX
2C
FX
0N
FX
0(S)
Instruction
name
Operation
Execution
form
Expression in each language
Structured ladder/FBD
ST
FROM
16 bits
Continuous
FROM(EN, n1, n2, n3, d);
FROMP
16 bits
Pulse
FROMP(EN, n1, n2, n3, d);
DFROM
32 bits
Continuous
DFROM(EN, n1, n2, n3, d);
DFROMP
32 bits
Pulse
DFROMP(EN, n1, n2, n3, d);
Variable
Description
Data type
16-bit
operation
32-bit
operation
Input
variable
variable
EN
Execution condition
Bit
Unit No. of special extension unit/block
ANY16
ANY32
*1
Transfer origin buffer memory (BFM) number
ANY16
ANY32
*1
Number of transfer points
ANY16
ANY32
*1
Variable
ENO
Execution state
Bit
Transfer destination device
•
•
16-bit operation: n
3
points occupied
•
32-bit operation: 2
× n
3
points occupied
ANY16
ANY32
FROM
EN
n1
n2
n1
n2
ENO
d
n3
FROMP
EN
n1
n2
n1
n2
ENO
d
n3
DFROM
EN
n1
n2
n1
n2
ENO
d
n3
DFROMP
EN
n1
n2
n1
n2
ENO
d
n3