Representation Of The Nck Analog Input/Output Values - Siemens SINUMERIK Series Function Manual

Extended functions
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1.2.4.3

Representation of the NCK analog input/output values

The digitized analog values are represented at the NC/PLC interface as fixed-point numbers
(16 bits including sign) in the two's complement.
Bit number
Significanc
e
SG: Sign
Increment
For a resolution of 16 bits and a nominal range of ±10 V, the increment is:
20 V / 2
Resolutions < 16 bits
If the resolution of an analog module is less than 16 bits including sign, then the digitized
analog value is entered in the interface starting from bit 14. The unused least significant bit
positions are filled with "0".
14-bit resolution
For a resolution of 14 bits including sign and a nominal range of ±10 V, the increment is:
20 V / 2
Bit 0 ... 1 are always "0".
12-bit resolution
For a resolution of 12 bits including sign and a nominal range of ±10 V, the increment is:
20 V / 2
Bit 0 ... 3 are always "0".
Extended Functions
Function Manual, 03/2013, 6FC5397-1BP40-3BA1
15
14
13
12
SG
2
2
2
14
13
12
Minimum value
-32768
D
8000
H
= 20 V / 65536 ≈ 0.305 mV
16
= 20 V / 16384 ≈ 1.22 mV
14
= 20 V / 4096 ≈ 4.88 mV
12
A4: Digital and analog NCK I/Os for SINUMERIK 840D sl
11
10
9
8
7
2
2
2
2
2
11
10
9
8
7
1.2 Access via PLC
6
5
4
3
2
2
2
2
2
2
6
5
4
3
2
Maximum value
32767
D
7FFF
H
1
0
2
2
1
0
43

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