Fnc141 - Wtob / Word To Byte - Mitsubishi Electric FX3G SERIES Programming Manual

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
19.2 FNC141 – WTOB / WORD to BYTE
Outline
This instruction separates consecutive 16-bit data in byte units (8 bits).
1. Instruction format
FNC 141
WTOB 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 (WTOB and WTOBP)
1) "n/2" 16-bit data stored in
as shown below.
D
Command
input
b15
+0 High-order byte
S
+1 High-order byte
*
High-order byte
+n/2
* When "n" is an odd number, "n/2" is
rounded up.
When "n" is "5", for example, "
+3" is used.
2) "00H" is stored in the high-order byte (8 bits) of each device (
Mnemonic
16-bit Instruction
7 steps WTOB
WTOBP
Head device number storing data to be separated in byte units
Head device number storing result of separation in byte units
Number of byte data to be separated (0 ≤ n)
Digit Specification
S and later is separated into "n" bytes, and stored in "n" devices starting from
FNC141
S D
WTOBP
b8 b7 b0
Low-order byte
Low-order byte
Low-order byte
S
19 Data Operation 2 – FNC140 to FNC149
19.2 FNC141 – WTOB / WORD to BYTE
Operation Condition
32-bit Instruction
Continuous
Operation
Pulse (Single)
Operation
Description
Word Devices
Special
System User Index
Unit
V Z Modify K H
n
b15
+0 00H
D
+1 00H
+2 00H
+3 00H
+n-2 00H
+n-1 00H
"00H" is stored.
D and later) storing the separated byte data.
Mnemonic Operation Condition
−
−
Data type
16-bit binary
Others
Con- Real Charac-
stant Number ter String
E " "
b8 b7 b0
Low-order byte
High-order byte
Low-order byte
"n" bytes
High-order byte
Low-order byte
High-order byte
11
12
13
14
Pointer
15
P
16
17
18
19
20
535