Rockwell Automation 1771-N SERIES High Resolution Analog Module User Manual User Manual
Page 44
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4–4
Configuring the Module
Publication 1771ĆUM127B-EN-P - December 2002
The 1771-N series modules use 15-bit signed magnitude BCD. The
maximum range value available then becomes +
7999.
Figure 4.1
4ĆDigit BinaryCoded Decimal
1 X 2
2
= 4
1 X 2
1
= 2
1 X 2
0
= 1
1 X 2
3
= 8
0 X 2
2
= 0
0 X 2
1
= 0
1 X 2
0
= 1
1 X 2
3
= 8
0 X 2
2
= 0
0 X 2
1
= 0
1 X 2
0
= 1
1 X 2
3
= 8
0 X 2
2
= 0
0 X 2
1
= 0
1 X 2
0
= 1
0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1
7
9
9
9
10
7
9
9
9
12955ĆI
Sign
Bit
0 = +
1 = Ć
Sign Bit Ć
Table 4.A
BCD Representation
Place Value
2
3
(8)
2
2
(4)
2
1
(2)
2
0
(1)
Decimal
Equivalent
0
0
0
0
0
0
0
0
1
1
0
0
1
0
2
0
0
1
1
3
0
1
0
0
4
0
1
0
1
5
0
1
1
0
6
0
1
1
1
7
1
0
0
0
8
1
0
0
1
9
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