Siemens SINUMERIK 840D sl Function Manual page 50

Digital and analog NCK I/Os (A4)
1.2 NCK I/O via PLC
Table 1-2 Examples of digital analog-value representation
Resolution
Bit number
Significance of the bits
14-bit analog value
12-bit analog value
For the resolutions and rating ranges of the analog input/output modules used, see:
References:
/PHD/ SINUMERIK 840D Configuration Manual NCU(HW)
/S7H/ SIMATIC S7-300 Software Installation Manual, Technology Functions.
Examples
Here are two examples of digital analog-value representation for a rating range of 10 V and
14-bit resolution.
Example 1:
Analog value:
Magnitude (decimal number):
Magnitude (pure binary number):
Word (pure binary number):
Word (hexadecimal number):
Example 2:
Analog value:
Magnitude (decimal number):
Magnitude (pure binary number):
Two's complement:
Word (pure binary number):
Word (hexadecimal number):
50
Binary analog value
High byte
15 14 13 12 11
SG 2 2 2 2
14 13 12
0 1 1 1 1
0 1 1 1 1
Low byte
10 9 8 7
2 2 2 2
11 10 9 8 7
0 0 1 1
0 0 1 1
9.5 V
7782 = j9.5(V)j:10(V) * 8192
0111 1001 1001 10
0111 1001 1001 1000
7998
-4.12 V
3375 = j-4.12(V)j:10(V) * 8192
0011 0100 1011 11
1100 1011 0100 01
1100 1011 0100 0100
CB44
6 5 4 3
2 2 2 2
6 5 4 3
0 0 1 1
0 0 1 0
Function Manual, 01/2008, 6FC5397-1BP10-3BA0
2 1 0
2 2 2
2 1 0
0 0 0
0 0 0
Extended Functions