4. Analogue input module CPX−4AE−T
4−11
Festo P.BE−CPX−AX−EN en 0503b
4.3.3
Connecting temperature sensors to the analogue inputs
Each input provides a constant source of current and two
connections for measuring the voltage drop at the sensor. The
voltage drop can be measured at various points, dependng
on the degree of accuracy desired. A distinction is therefore
made between various connecting methods:
4−cable design
The highest degree of accuracy is achieved with the 4−cable
design:
2 cables transmit the current from the constant source of
current (connections lx+, Ix−) through the sensor,
2 cables serve for measuring the voltage drop directly on
the sensor. Connections Ux+ and Ux− are highly−resistive,
so that the cable resistance does not lead to incorrect
measurement.
1
Constant source
of current in the
module
2
Connecting pin of
the CPX module
3
Current supply
for sensor
4
Separate voltage
cable
5
Temperature
sensor
Ix+
Ix−
Ux+
Ux−
1
2
3
4
5
3
Fig.4/2:
Connection in 4−cable design
Summary of Contents for CPX-2AA-U-I
Page 2: ......
Page 19: ...Overview and connection technology I O modules 1 1 Festo P BE CPX AX EN en 0503b Chapter 1...
Page 44: ...1 Overview and connection technology I O modules 1 26 Festo P BE CPX AX EN en 0503b...
Page 45: ...Analogue input module CPX 2AE U I 2 1 Festo P BE CPX AX EN en 0503b Chapter 2...
Page 83: ...Analogue input module CPX 4AE I 3 1 Festo P BE CPX AX EN en 0503b Chapter 3...
Page 122: ...3 Analogue input module CPX 4AE I 3 40 Festo P BE CPX AX EN en 0503b...
Page 123: ...Analogue input module CPX 4AE T 4 1 Festo P BE CPX AX EN en 0503b Chapter 4...
Page 157: ...Analogue output module CPX 2AA U I 5 1 Festo P BE CPX AX EN en 0503b Chapter 5...
Page 198: ...5 Analogue output module CPX 2AA U I 5 42 Festo P BE CPX AX EN en 0503b...
Page 199: ...Technical appendix A 1 Festo P BE CPX AX EN en 0503b Appendix A...
Page 221: ...Index B 1 Festo P BE CPX AX EN en 0503b Appendix B...
Page 222: ...B Index B 2 Festo P BE CPX AX EN en 0503b Contents B Index B 1...
