Siemens SINUMERIK Series Function Manual page 44

A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
1.2 Access via PLC
Representation of the maximum value for different resolutions
Bit number
Significance of the bits
16-bit resolution: 32767
D
14-bit resolution: 8191
D
12-bit resolution: 2047
D
Note
The data (resolution, nominal range) of the analog input/output module used can be taken
from the documentation of the particular module.
Examples
Digital representation of analog values at a resolution of 14 bits including sign and a nominal
range of ±10 V.
Example 1: Analog value = 9.5 V
Digitized analog value (decimal):
Digitized analog value 14-bit (binary):
Digitized analog value 16-bit (binary):
Digitized analog value 16-bit (hex):
Example 2: Analog value = -4.12 V
Digitized analog value (decimal):
Digitized analog value 14-bit (binary):
Digitized analog value 16-bit (binary):
Digitized analog value 16-bit (hex):
44
15 14
SG 2
14
= 7FFF 0 1
H
= 1FFF 0 1
H
= 7FF 0 1
H
13 12 11 10 9
2 2 2 2 2
13 12 11 10 9
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
9.5 V / 20 V * 16384 = 7782
01 1110 0110 0110
0111 1001 1001 10
7998
-4.12 V / 20 V * 16384 = -3375
11 0010 1101 0001
1100 1011 0100 01
CB44
8 7 6 5 4
2 2 2 2 2
8 7 6 5 4
1 1 1 1 1
1 1 1 1 1
1 1 1 1 1
00
H
00
H
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
3 2 1 0
2 2 2 2
3 2 1 0
1 1 1 1
1 1 0 0
0 0 0 0
Extended Functions