How A PLC Input Reads A 4-20 MA Signal Featuring The PLC Tools SIM-ALP2

All 4-20mA inputs are voltage inputs with a precision load resistor and Ohms Law.

In this video we go through how to wire a 4-20mA signal and how controllers read them using load resistors and voltage inputs. Then we use the PLC Tools SIM-ALP2 analog simulator to show the relationship between voltage and milliamps when using load resistors.