4-20 mA vs 0-10 V: Which Analog Signal Should You Use?
As an electrical or automation engineer, you’ve probably asked this more than once:
“Should I choose a 0-10V or 4-20mA signal?”
Both are analog signals used to transmit sensor data to a PLC or controller. But each has strengths depending on the application.
Here’s a quick comparison:
0-10V Signal
- Easy to understand (voltage = value)
- Great for short distances (< 20 meters)
- Prone to electrical noise and voltage drop
- Hard to detect cable cuts or signal loss
4-20mA Signal
- Current-based signal: carries info through current
- Excellent noise immunity – ideal for long cable runs (100+ meters)
- Instantly detects disconnections (below 4mA = alarm)
- More reliable in harsh industrial environments
My Recommendation
- For simple setups and close sensors: 0-10V works fine
- For long distances, industrial zones, or high-precision setups:
- Stick with 4-20mA – it’s your best friend for stability and reliability.