Fnc142 - Btow / Byte To Word - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
19.3 FNC142 – BTOW / BYTE to WORD
Outline
This instruction combines the low-order 8 bits (low-order byte) of consecutive 16-bit data.
1. Instruction format
FNC 142
BTOW P
2. Set data
Operand type
S
D
n
3. Applicable devices
Bit Devices
Oper-
and System User
Type
X Y M T C S D .b KnX KnY KnM KnS T C D R U \G
S
D
n
Explanation of function and operation
1. 16-bit operation (BTOW and BTOWP)
1) The low-order byte (8 bits) of "n" 16-bit data starting from
from D as shown below.
Command
input
S
"n"
bytes
+n-1
2) The high-order byte (8 bits) of each combination source 16-bit data (
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
"00H" is stored in the high-order byte (8 bits) of
+0
S
+1
When
+2
"n" is
+3
"5"
+4
4) When "n" is "0", the BTOW instruction is not executed.
Mnemonic
16-bit Instruction
7 steps BTOW
BTOWP
Head device number storing data to be combined in byte units
Head device number storing data acquired by combination in byte units
Number of byte data to be combined (0 ≤ n)
Digit Specification
FNC142
S D
BTOWP
b15 b8 b7
+0 1st byte data
+1 2nd byte data
+2 3rd byte data
"n"th byte data
The high-order byte is ignored.
b15 b8 b7
ABH 12H
CDH 34H
EFH 56H
ABH 78H
CDH 9AH
The high-order bytes is ignored.
19 Data Operation 2 – FNC140 to FNC149
19.3 FNC142 – BTOW / BYTE to WORD
Operation Condition
32-bit Instruction
Continuous
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User Index
Unit
V Z Modify K H
is combined, and stored in "n/2" devices starting
S
n
b0 b15
+0
D
+1
+n/2 *
* When "n" is an odd number,
refer to "3)" below
S
to
S S
D +2.
b0 b15
+0
D
+1
+2
Mnemonic Operation Condition
−
−
Data type
16-bit binary
Others
Con- Real Charac-
stant Number ter String
E " "
b8 b7 b0
2nd byte 1st byte
4th byte 3rd byte
"n"th byte "n-1"th byte
and later) is ignored.
+4 is stored in to
D D
b8 b7 b0
34H 12H
78H 56H
00H 9AH
When "n" is "5",
"00H" is stored.
11
12
13
14
Pointer
15
P
16
17
18
19
+2, and
20
537