SLVAEW6 December 2020 TPS2661
- Trademarks
- 1Introduction
- 2Protection Required for Current Inputs in Analog Input Modules
- 3Typical Discrete Circuit for Protection of Current Input
-
4TPS26610 for Analog Current Loop
Protection
- 4.1 Current Input Protection with TPS26610
- 4.2 Accurate Current Limiting with TPS26610
- 4.3 Leakage Current of TPS26610 and Current Measurement Accuracy
- 4.4 Protection from Mis-wiring to Field Power Supplies
- 4.5 Heating and Temperature Rise with TPS26610
- 4.6 Reduction in PCB Size with TPS26610 for Current Input Protection
- 5Conclusion
1 Introduction
The Programmable Logic Controllers (PLC) are widely used for automation in industries. The PLC collects data from sensors, analyze this data, and controls the industrial process through actuators. One way of collecting data from different sensors is through current loops. The sensor transmitters convert the measured parameter in to a current output and the current is transmitted over a cable to analog input module for measurement. The analog input module converts the analog current value in to a digital value by measuring the voltage drop across burden resistor. Figure 1-1 illustrates an analog input module with current inputs.
Figure 1-1 Current input protection in Analog
Input modules