AH500 Programming Manual
6-264
API
Instruction code Operand Function
1202 DECO P
S, D, n
Decoder
Device
X Y M S T C HC D L SM SR E PR K 16# “$” DF
16-bit instruction (7 steps)
Symbol:
S
：
Source device Bit/Word
D
：
Device in which the decoded values are
stored
Bit/Word
n
：
Number of bits whose values are decoded Word
Explanation:
1. The values of the lower n bits in the source device specified by S are decoded as the values of
the lower 2
n
bits in D.
2. When D is a bit device, n is within the range between 1 and 8. When n is 8, the values of the 8
bits is decoded as the values of the 256 bits. (Please note that the devices in which the
decoded values are stored can not be used repeatedly.)
3. When D is a word device, n is within the range between 1 and 4. When n is 4, the values of the
4 bits is decoded as the values of the 16 bits.
4. Generally, the pulse instruction DECOP is used.
Example 1:
1. When Y0.0 is switched from OFF to ON, the instruction DECO decodes the values of the 3 bits
in X0.0~X0.2 as the values of the 8 bits in M100~M107.
2. After the values of the 3 bits in X0.0~X0.2 are added up, the value 3 is gotten. The third bit in
M10~M1007, that is, the bit in M103, is set to 1.
3. After the instruction DECO is executed and Y0.0 is switched OFF, the values of the 8 bits in
M100~M107 are unchanged.
X0.2 X0.1
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 12
3
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