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Deployment I/O periphery
Analog input > Analog value representation
5.3.2 Analog value representation
Number representation in
Siemens S7 format
Resolu-
tion
Bit number
15
14
Value
SG
14
2
11Bit+sign
SG
*) The lowest value irrelevant bits of the output value (0) are marked with "X".
Sign bit (SG)
Behavior at error
Voltage measurement
0 ... 10V
Measuring range
Voltage
(U)
0 ... 10V
> 11.759V
11.759V
10V
5V
0V
-0.8V
< -0.8V
88
High byte (byte 0)
13
12
11
10
13
12
11
10
2
2
2
2
Measuring value
Here it is essential:
Bit 15 = "0": à positive value
n
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.
Decimal
(D)
32767
32511
27648
13824
0
-2212
-32768
Analog value - twos complement
9
8
7
6
9
8
7
6
2
2
2
2
Hex
Range
7FFFh
overflow
7EFFh
overdrive range
6C00h
nominal range
3600h
0000h
F75Ch
underdrive range
8000h
underflow
VIPA System MICRO
Low byte (byte 1)
5
4
3
2
5
4
3
2
2
2
2
2
X*
X*
Formulas
D: decimal value
U: voltage value
HB400 | CPU | M13-CCF0000 | en | 16-47
1
0
1
0
2
2
X*
X*
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