VIPA HB130E SM, Manual

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Manual VIPA System 300V
Chapter 6 Analog Input Modules
HB130E - SM - Rev. 07/44 6-23
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 of an analog value is 14 Bit plus sign Bit. Bit 15 serves as
sign bit (SG) with the meaning:
Bit 15 = "0"
→
positive value
Bit 15 = "1"
→
negative value
Depending upon parameterized interference frequency (integration time)
the modules offers different resolutions. The not used low byte bits are set
to "0".
Resolution Analog value
High-Byte Low-Byte
Bit number 15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
Value SG 2
14
2
13
2
12
2
11
2
10
2
9
2
8
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
14Bit + sign SG Measuring value (interference frequency 10Hz) 0
12Bit + sign SG Measuring value (interference frequency 50, 60Hz) 0 0 0
9Bit + sign SG Measuring value
(interference frequency 400Hz)
0 0 0 0 0 0
Note!
This resolution does not apply to temperature levels. The converted
temperature levels are the result of a conversion of the analog module.
As soon as a measured value exceeds the overdrive region and/or falls
below the underdrive region, the following value is issued:
Measuring value > end of overdrive region:
32767 (7FFFh)
Measuring value < end of underdrive region: -32768 (8000h)
Analog value
representation
Resolution
Behavior at over-
and underflow