Which method has better noise immunity for connecting a PLC to an office PC?

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SUMMARY

The discussion centers on connecting a PLC to an office PC, comparing RS485 and Ethernet cable options. Ethernet is determined to have superior noise immunity due to its transformer coupling, making it more suitable for environments with high current cables and heat sources. In contrast, RS485 relies on a common ground, which can lead to increased data errors in such conditions. Therefore, for a distance of 7.8 meters in a noisy environment, Ethernet is the recommended choice for reliable data transmission.

PREREQUISITES
  • Understanding of RS485 communication protocols
  • Familiarity with Ethernet networking principles
  • Knowledge of noise immunity concepts in electrical engineering
  • Basic grasp of PLC (Programmable Logic Controller) functionality
NEXT STEPS
  • Research the specifications and advantages of Ethernet over RS485 in industrial applications
  • Learn about noise reduction techniques in wiring for PLC systems
  • Explore the implementation of Ethernet in PLC communication
  • Investigate common grounding issues in RS485 networks and their solutions
USEFUL FOR

Electrical engineers, automation professionals, and technicians involved in industrial communication systems will benefit from this discussion, particularly those tasked with ensuring reliable data transmission in noisy environments.

ws0619
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Hi,
I want to connect my PLC at the control panel board to my office PC.

There are two ways available for me to connect it. One is by using RS485 and one is by ethernet cable.

The main concern is the cable has to travel for a far distance, about 7.8meter and the environment is full of high current cable and also hot oven.

Which one is better in reducing data sending error?

Please enlighten me.
Thanks!
 
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ws0619 said:
Hi,
I want to connect my PLC at the control panel board to my office PC.

There are two ways available for me to connect it. One is by using RS485 and one is by ethernet cable.

The main concern is the cable has to travel for a far distance, about 7.8meter and the environment is full of high current cable and also hot oven.

Which one is better in reducing data sending error?

Please enlighten me.
Thanks!

Ethernet is transformer coupled, so it will have much better noise immunity. RS-485 is DC-connected, so all of the devices connected to the RS-485 network need to have a common ground.
 

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