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Deployment I/O periphery
Analog input > Analog value representation
5.3 Analog input
5.3.1 Properties
5.3.2 Analog value representation
Number representation in
Siemens S7 format
Resolu-
tion
Bit number
15
14
Value
SG
2
14
11Bit+sign
SG
*) The lowest value irrelevant bits of the output value (0) are marked with "X".
Sign bit (SG)
Behavior at error
120
n
2xUx12Bit (0 ... 10V) fixed.
n
The analog channels of the module are not isolated to the electronic power supply.
n
The analog part has no status indication.
Temporarily not used analog inputs must be connected to the concerning
ground.
High byte (byte 0)
13
12
11
10
2
13
2
12
2
11
2
10
Measuring value
Here it is essential:
n
Bit 15 = "0": à positive value
n
Bit 15 = "1": à negative value
As soon as a measured value exceeds the overdrive region respectively falls below the
underdrive region, the following value is issued:
n
Measuring value > end of overdrive region:
32767 (7FFFh)
n
Measuring value < end of underdrive region:
-32768 (8000h)
At a parameterization error the value 32767 (7FFFh) is issued.
When leaving the defined range during analog output 0V respectively 0A is issued.
Analog value - twos complement
9
8
7
6
2
9
2
8
2
7
2
6
VIPA System SLIO
Low byte (byte 1)
5
4
3
2
2
5
2
4
2
3
2
2
X*
X*
HB300 | CPU | 013-CCF0R00 | en | 19-30
1
0
2
1
2
0
X*
X*
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