Input Sensors with PLC: 4-20 mA Current Loop

Learn about the 4-20mA current loop circuit and its components, a circuit used when connecting analog industrial sensors to PLCs (programmable logic controllers.

Introduction

• The 4-20 mA current loop circuit
• What you should know before watching

1. Introduction to PLC and Industrial Automation

• Introduction to the 4-20 mA loop
• Industrial 4-20 mA current loop basics
• Industrial 4-20 mA current loop components
• Industrial transmitters overview
• Optional: Calculating mA current reading
• Example: Wiring a temperature sensor to the PLC
• Why start from 4 mA instead of 0 mA?
• Why choose 4 mA instead of 10 mA?
• Load resistor in a 4-20 mA current loop

Conclusion

• Next steps