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Per Westermark
07/16/12 10:13
Read: 464 times

#187951 - Industrial environments can be dangerous to electronics
Responding to: Andy Neil's previous message
Noise need not be an issue, with slow relays.

But there may be a need for protection from very strong spikes on the signals. And a possibility of very big voltage differences between controller board and relay board, depending on how they are powered.

That is why it is important that the board is designed for industrial use - EMI filters as low-pass filters and diodes to clamp overvoltages.

List of 10 messages in thread
74LS245 ouput cable drive distance      Raj Nambiar      07/15/12 23:32      
   what is the termination      Erik Malund      07/16/12 00:31      
   Frequancy?      Per Westermark      07/16/12 00:33      
      not only capacitance      Erik Malund      07/16/12 01:22      
         Thanks for the replies      Raj Nambiar      07/16/12 01:32      
            DC      Per Westermark      07/16/12 01:50      
               one thing to consider ...      Richard Erlacher      07/16/12 03:18      
            "an industrial automation project"      Andy Neil      07/16/12 09:11      
               Industrial environments can be dangerous to electronics      Per Westermark      07/16/12 10:13      
                  optical isolation      Mahmood Elnasser      07/16/12 18:01      

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