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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
19.2 FNC141 – WTOB / WORD to BYTE
Outline
This instruction separates consecutive 16-bit data in byte units (8 bits).
1. Instruction format
2. Set data
3. Applicable devices
Explanation of function and operation
1. 16-bit operation (WTOB and WTOBP)
1) "n/2" 16-bit data stored in and later is separated into "n" bytes, and stored in "n" devices starting from
as shown below.
2) "00H" is stored in the high-order byte (8 bits) of each device ( and later) storing the separated byte data.
Operand type Description Data type
Head device number storing data to be separated in byte units
16-bit binary
Head device number storing result of separation in byte units
n Number of byte data to be separated (0 ≤ n)
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
3333 3
3333 3
n 33 33
P
FNC 141
WTOB
−
−
Mnemonic Operation Condition
16-bit Instruction
7 steps
WTOB
WTOBP
Mnemonic Operation Condition
Continuous
Operation
Pulse (Single)
Operation
32-bit Instruction
S
D
S
D
S
D
Command
input
FNC141
WTOBP
S
D
n
b15 b8 b7 b0
S
+0
+1
+n/2
...
*
* When "n" is an odd number, "n/2" is
rounded up.
When "n" is "5", for example, "
+3" is used.
D
+0
+1
...
"00H" is stored.
+2
+3
+n-2
+n-1
"n" bytes
High-order byte
High-order byte
High-order byte
Low-order byte
Low-order byte
Low-order byte
00H
00H
Low-order byte
High-order byte
00H
00H
Low-order byte
High-order byte
00H
00H
Low-order byte
High-order byte
...
...
b15 b8 b7 b0
S
D