Manual VIPA System 200V Chapter 3 Analog output modules
HB97E - SM-AIO - Rev. 12/32 3-3
Analog value
The analog values are only processed by the CPU in binary representation.
Hereby the process signals are transformed into digital format in the analog
module and passed on to the CPU as word variable.
The digitized analog value is the same for input and output values at the
same nominal range.
The resolution depends on the used module as follows:
Analog value
High byte Low byte
Bit number 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Resolution SG Analog value (word)
12bit + Sign SG Relevant output value X X X
11bit + Sign SG Relevant output value X X X X
10bit + Sign SG Relevant output value X X X X X
* The least significant irrelevant bits of the output value are marked by "X".
The algebraic sign bit is represented by Bit 15. Here it is essential:
Bit 15 = "0" → positive value
Bit 15 = "1" → negative value
Analog value
representation
Sign bit (SG)
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