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
3-97
API Mnemonic Operands Function
42 ENCO P
S, D, n
Encode
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 encode
D
: Destination for storing encoded data
n
: Number of bits to encode
Description:
1. Encodes the lower “2 n ” bits of source
S
and stores the result in
D
.
2. If the source device
S
has multiple bits set to a 1, processing is performed on the highest bit
position. The bit number set in S is encoded to the low bits of D.
3. This instruction works best with the pulse instruction (ENCOP).
4. When operand
S
is a bit device,
n
=1~8, when operand
S
is a word device,
n
=1~4
5. ELC-PC/PA/PH, ELCM-PH/PA series: If no bits in
S
is active (1), M1067, M1068 = ON and
D1067 records the error code H0E1A.
Program Example 1:
1.
S
valid range: 0<
n
≦
8. If
n
=0 or
n
>8, an error will occur.
2. When
n
=8, the maximum decoded data is 2
8
= 256 points.
3. When X0 goes from OFF
→
ON, the data in (M0 to M7) will be encoded and stored in the low
3 bits of D0 (b2 to b0). The unused bits in D0 (b15 to b3) will be all set to 0.
4. After the execution is completed, X0 is changed to OFF and the data in
D
remain unchanged.
ENCOP M0 K3 D0
X0
0 0 0 0 0 0 0 0 0 0 0 0 1 0 0
1 2 4
b15
b0
1
0 0 0 0 1 0 0 0
7 6 5 4 3 2 1 0
M07 M06 M05 M04 M03 M02 M01 M00
All be 0 (zero)
When 3 is specified as effective bits, 8 points are occupied.
Result after encoding
Which point, counting from M0, is ON and stored in BIN.
D0