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

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Ethernet offers superior noise immunity compared to RS-485, especially in environments with high electromagnetic interference, such as those with high current cables and heat sources. The transformer coupling in Ethernet helps reduce data transmission errors over longer distances, like the 7.8 meters mentioned. In contrast, RS-485 relies on a common ground, making it more susceptible to noise in challenging environments. Therefore, for this specific application, Ethernet is the recommended choice for connecting a PLC to an office PC. Proper selection of the connection method is crucial for reliable data transmission.
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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