Representation Of Analog Values - Siemens SIMATIC ET 200SP Manual

Representation of analog values

B.1 Representation of analog values
This appendix describes the analog values for all output ranges supported by the AQ 2xI ST
analog module.
Measured value resolution
The digitized analog value is the same for all output values at the same nominal range.
Analog values are output as fixed point numbers in two's complement.
In the following table, you will find the representation of the binary analog values and the
associated decimal or hexadecimal units of the analog values.
The resolutions 15 and 16 bits including sign are shown. Each analog value is entered left
aligned into the ACCU. The bits marked with "x" are set to "0".
Table B- 1 Possible resolutions of the analog values
Resolution in bits
15
16
30
Values
Decimal Hexadecimal
2 2
1 1
Analog value
High byte
Sign 0 0 0 0 0 0 0
H
Sign 0 0 0 0 0 0 0
H
Analog output module AQ 2xI ST (6ES7135-6GB00-0BA1)
B
Low byte
0 0 0 0 0 0 1 x
0 0 0 0 0 0 0 1
Manual, 12/2015, A5E36104864-AA