Mitsubishi Electric MELSEC FX3U Programming Manual page 562

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
3) When "n" is an odd number, "00H" is stored in the high-order byte (8 bits) of the final one among the
combination result destination devices as shown below.
For example, when "n" is "5", the low-order byte (8 bits) of
+2, and "00H" is stored in the high-order byte (8 bits) of
D
S
When
"n" is
"5"
4) When "n" is "0", the BTOW instruction is not executed.
Related instruction
Instruction
WTOB (FNC141)
Caution
Devices storing the combination source data may be equivalent to devices storing the combined data.
After combination, however, the high-order byte (8 bits) of the combination source data stored in the devices
used for the combination destination data is erased and overwritten with the data acquired by combining the
high-order byte (8 bits).
=D11
S
D12
When
D13
"n" is
D14
"6"
D15
D16
Because these combination source devices are
also used for the combination destination, "ABH"
and "CDH" are erased and overwritten.
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 combination source devices
code: K6706)
• When the combined data destination devices
(error code: K6706)
When "n" is an odd number, the number of a rounded up value decides the numer of devices. (error code:
K6706)
560
b15 b8 b7
+0 ABH 12H
+1 CDH 34H
+2 EFH 56H
+3 ABH 78H
+4 CDH 9AH
The high-order bytes is ignored.
Separates consecutive 16-bit data in byte units (8 bits).
b15 b8 b7
ABH 12H
CDH 34H
EFH 56H
ABH 78H
CDH 9AH
EFH BCH
The high-order bytes is ignored.
b0 b15
+0
D
+1
+2
Description
b0
=D10
D
D11
D12
D13
D14
D15
D16
to +n-1 are outside the specified device range (error
S S
to +n/2 are outside the specified device range
D D
19 Data Operation 2 – FNC140 to FNC149
19.3 FNC142 – BTOW / BYTE to WORD
to +4 is stored in
S S
+2.
D
b8 b7
34H 12H
78H 56H
00H 9AH
When "n" is "5",
"00H" is stored.
b15 b8 b7
34H 12H
78H 56H
BCH 9AH
EFH 56H
ABH 78H
CDH 9AH
EFH BCH
It is not changed.
to
D
b0
b0