Mitsubishi Electronics FX3G User Manual
535
FX
3S
/FX
3G
/FX
3GC
/FX
3U
/FX
3UC
Series
Programming Manual - Basic & Applied Instruction Edition
19 Data Operation 2 – FNC140 to FNC149
19.2 FNC141 – WTOB / WORD to BYTE
11
FN
C30
-FN
C3
C30
-FN
C3
9
R
ota
tion and
Shi
ft
ft
12
FN
C40-FN
C40-FN
C49
D
ata O
perati
perati
on
13
FNC
50-FNC
59
High-Speed
Proc
essing
14
FM
C60-FN
C60-FN
C69
H
andy
In
struction
15
FN
C70-FN
C70-FN
C79
E
xternal
F
X
I/O
De
vice
16
FNC
80-FNC
89
External
FX
Dev
ice
ice
17
FNC1
00-
FNC10
00-
FNC10
9
Dat
a
a
Transfer 2
18
FNC1
10-
FNC139
FNC139
Fl
oati
ng Poi
nt
19
FNC14
0-F
N
C
149
Da
ta
Operation 2
20
FNC1
50-
FNC159
FNC159
Pos
itioning
itioning
Control
3) When "n" is an odd number, only the low-order byte (8 bits) of the final separation source device is regarded as
the target data as shown in the figure below.
For example, when "n" is "5", the data from
For example, when "n" is "5", the data from
to the low-order byte (8 bits) of
+2 is stored in
to
+4.
4) When "n" is "0", WTOB instruction is not executed.
Related instruction
Caution
Devices storing the separation source data can overlap devices storing the separated data.
When "n" is an odd number, however, the high-order byte (8 bits) of the final separation source device is overwritten
and erased.
When "n" is an odd number, however, the high-order byte (8 bits) of the final separation source device is overwritten
and erased.
Errors
An operation error is caused in the following cases; The error flag M8067 turns ON, and the error code is stored in
D8067.
D8067.
• When the separation source devices
to
+n/2 are outside the specified device range (error code:
K6706)
When "n" is an odd number, the number of a rounded up value decides the number of devices. (error code: K6706)
When "n" is an odd number, the number of a rounded up value decides the number of devices. (error code: K6706)
• When the separated data destination devices
to
+n-1 are outside the specified device range (error
code: K6706)
Program example
In the program shown below, the data stored in D10 to D12 is separated in byte units, and stored in D20 to D25.
Instruction
Description
BTOW (FNC142)
Combines the low-order 8 bits (low-order byte) of consecutive 16-bit data.
S
S
D
D
b15
b8 b7
b0
S
+0
+1
+2
+1
+2
It is ignored when
"n" is "5".
"n" is "5".
D
+0
+1
+1
"00H" is stored.
+2
+3
+4
+3
+4
When "n"
is "5"
is "5"
12H
56H
56H
FEH
39H
78H
78H
DCH
00H
00H
00H
39H
12H
12H
00H
00H
00H
78H
56H
56H
00H
DCH
b15
b8 b7
b0
S
=D12
"36H" is ignored when "n" is "5".
Because D14 is also used in the
separation result destination devices D
and later, "36H" is erased and
overwritten.
D
=D12
D13
"00H" is stored.
When "n"
is "5"
is "5"
32H
34H
36H
34H
36H
31H
33H
35H
33H
35H
00H
00H
00H
31H
32H
32H
00H
00H
00H
33H
34H
34H
00H
35H
D13
D14
D14
D14
D15
D16
D15
D16
b15
b8 b7
b0
b15
b8 b7
b0
S
S
D
D
X000
FNC141
WTOBP
WTOBP
D10
D20
K6
END
D10
D20
D21
D21
6 bytes
FDH
57H
34H
34H
58H
E2H
44H
00H
00H
00H
58H
FDH
00H
00H
00H
E2H
57H
00H
44H
D11
D12
D12
D22
D23
D24
D23
D24
00H
34H
D25
b15
b8 b7
b0
b15
b8 b7
b0
"00H" is stored.