Eaton ELC-PB, Programming Manual

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3 . I n s t r u c t i o n S e t
M N050 03003E F or mo re infor ma tio n vi sit:
w w w. e a t o n . c o m
3-95
API Mnemonic Operands Function
41 DECO P
S, D, n
Decode
Bit Devices Word devices Program Steps
Type
OP
X Y M S K H KnX KnY KnM KnS T C D E F
S * * * * * * * * * * *
D * * * * * * * *
n * *
DECO, DECOP: 7 steps
ELC ELCB ELCM
PB PC/PA/PH PV PB PH/PA
32 16 P 32 16 P 32 16 P 32 16 P 32 16 P
Operands:
S
: Source to decode
D
: Destination
n
: Number of bits to decode
Description:
1. Decodes the lower “
n
” bits of source
S
and stores the result of “2 n ” bit in
D
.
2. This instruction works best with the pulse instruction (DECOP).
3. When operand
D
is a bit device,
n
=1~8, when operand
D
is a word device,
n
=1~4
Program Example 1:
1.
n
valid range: 0<
n
≦
8. But if
n
=0 or
n
>8, an error will occur.
2. If
n
= 8, the decoded data is 2
8
= 256 bits of data.
3. When X20 goes from OFF
→
ON, the data of X0~X2 will be decoded to M100~M107.
4. If the source data is 3, M103 (third bit from M100) = ON.
5. After the execution is completed, X20 is changed to OFF. The result in M103 remains.
DECOP X0 K3 M100
X20
X2 X1 X0
M107 M106 M105 M104 M103 M102 M101 M100
0 1 1
1
0 0 0 0 0 0 0
3
7 6 5 4 2 1 0
4 1 2
3