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

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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.