What is the purpose of a 250 ohm resistor in a 4 to 20 mA loop for a PLC system?
A. To Prevent the overload the siganl
B. To convert the voltage signal to a current signal
C. To convert the current signal to a voltage signal
D. To protect the transmitter from voltage spikes
Answer:C
What is the purpose of a 250 ohm resistor in a 4 to 20 mA loop for a PLC system?
A. To Prevent the overload the siganl B. To convert the voltage signal to a current signal C. To convert the current signal to a voltage signal D. To protect the transmitter from voltage spikes
Explanation: The 250 ohm resistor in a 4 to 20 mA loop is used to convert the current signal to a voltage signal. This is done by using Ohm’s law to calculate the voltage drop across the resistor based on the current flowing through it.