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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
19 Data Operation 2 – FNC140 to FNC149
19.2 FNC141 – WTOB / WORD to BYTE
11
FNC30-FNC39
Rotation and
Shift
12
FNC40-FNC49
Data Operation
13
FNC50-FNC59
High Speed
Processing
14
FMC60-FNC69
Handy
Instruction
15
FNC70-FNC79
External FX I/O
Device
16
FNC80-FNC89
External FX
Device
17
FNC100-FNC109
Data
Transfer 2
18
FNC110-FNC139
Floating Point
19
FNC140-FNC149
Data
Operation 2
20
FNC150-FNC159
Positioning
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 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.
Errors
An operation error is caused in the following cases; The error flag M8067 turns ON, and the error code is stored in
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 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
It is ignored when
"n" is "5".
D
+0
+1
"00H" is stored.
+2
+3
+4
When "n"
is "5"
12H
56H
FEH
39H
78H
DCH
00H
00H
39H
12H
00H
00H
78H
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"
32H
34H
36H
31H
33H
35H
00H
00H
31H
32H
00H
00H
33H
34H
00H 35H
D13
D14 D14
D15
D16
b15 b8 b7 b0
b15 b8 b7 b0
S
S
D
D
X000
FNC141
WTOBP
D10 D20 K6
END
D10 D20
D21
6 bytes
FDH
57H
34H
58H
E2H
44H
00H
00H
58H
FDH
00H
00H
E2H
57H
00H 44H
D11
D12 D22
D23
D24
00H 34HD25
b15 b8 b7 b0
b15 b8 b7 b0
"00H" is stored.