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Although PROFIBUS is well protected by its transmission technology against transmission errors, they cannot be completely excluded. Causes of error may include, for example, faulty transmitters, a badly shielded medium, signal reflections or excessively large divergences between the send and receive clocks.


Practical inspections have shown that the error rate on a cable is smaller than 10-4 , i.e. no more than one incorrect bit for every 10 000 bits transmitted. With the use of error detection and correction, these values can be even further reduced.


Errors occurring in a PROFIBUS system can be detected with simple tools.