5.3 Analog input
5.3.1 Properties
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.
5.3.2 Analog value representation
Resolu-
tion
Analog value - twos complement
High byte (byte 0)
Low byte (byte 1)
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
11Bit+sign
SG
Measuring value
X*
X*
X*
X*
*) The lowest value irrelevant bits of the output value (0) are marked with "X".
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.
Number representation in
Siemens S7 format
Sign bit (SG)
Behavior at error
VIPA System MICRO
Deployment I/O periphery
Analog input > Analog value representation
HB400 | CPU | M13-CCF0000 | en | 18-50
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