VIPA 238-2BC00 - Page 28

Chapter 2 Analog input modules Manual VIPA System 200V
2-4 HB97E - SM-AIO - Rev. 12/32
Analog values are represented as a two’s complement value.
Numeric notation:
Byte Bit 7 ... Bit 0
0 Bit 7 ... 0: binary measured value
1 Bit 6 ... 0: binary measured value
Bit 7: sign
0 positive
1 negative
+/- 10V
Voltage Decimal Hex
-10V -27648 9400
-5V -13824 CA00
0V 0 0
5V 13824 3600
10V 27648 6C00
0...10V
Formulas for the calculation:
10
27648
U
Value ⋅=
,
27648
10
⋅= ValueU
U: voltage, Value: decimal value
Voltage Decimal Hex
0V 0 0000
5V 13824 3600
10V 27648 6C00
1...5V
Formulas for the calculation:
10
27648
U
Value ⋅=
,
27648
10
⋅=ValueU
U: voltage, Value: decimal value
Voltage Decimal Hex
1V 0 0
3V 13824 3600
5V 27648 6C00
+/-4V
Formulas for the calculation:
4
1
27648
−
⋅=
U
Value
,
1
27648
4
+⋅= ValueU
U: voltage, Value: decimal value
Voltage Decimal Hex
-4V -27648 9400
0V 0 0
4V 27648 6C00
+/-400mV
Formulas for the calculation:
4
27648
U
Value ⋅=
,
27648
4
⋅= ValueU
U: voltage, Value: decimal value
Voltage Decimal Hex
-400mV -27648 9400
0V 0 0
400mV 27648 6C00
4....20mA
Formulas for the calculation:
400
27648
U
Value ⋅=
,
27648
400
⋅= ValueU
U: voltage, Value: decimal value
Current Decimal Hex
4mA 0 0
12mA 13824 3600
20mA 27648 6C00
+/- 20mA
Formulas for the calculation:
16
4
27648
−
⋅=
I
Value
,
4
27648
16
+⋅= ValueI
I: current, Value: decimal value
Current Decimal Hex
-20mA -27648 9400
-10mA -13824 CA00
0mA 0 0
10mA 13824 3600
20mA 27648 6C00
Formulas for the calculation:
20
27648
I
Value ⋅=
,
27648
20
⋅= ValueI
I: current, Value: decimal value
Numeric notation
in S7 from
Siemens