The status byte provides information regarding the “usability” of the process value. Some devices can be permanently connected to the network and some are handheld for ad hoc use.ĭuring operation, Profibus PA instruments carry a status byte with the process variable in every cycle. Bus and protocol analyzers are available from multiple sources. Profibus PA Troubleshooting DiagnosticsĪfter alarms, which parallel those for Profibus DP, checking the network is a good troubleshooting starting point. Run-time analysis tools perform oscilloscope functions (such as wave forms, signal levels, and reflections) and network topology determinations, and assist in locating cabling errors, faulty devices, etc. Many vendors provide tools for Profibus DP (RS-485). collection of statistics for repeats, drop-outs, corrupted messages, etc.analysis of protocol for Profibus DP and PA networks and devices.
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Profibus is one protocol over two different physical layers: RS-485 for Profibus DP in discrete applications and Manchester-encoded, bus-powered (MBP) for Profibus PA in process applications. Both specifications are part of IEC 61158. This diagnostic information can prevent downtime and accelerate Profinet troubleshooting.įirst, an explanation of the technologies: Profibus and Profinet International (PI) created, support, and maintain the Profibus and Profinet standards. One of the strengths of fieldbuses and industrial Ethernet protocols in general, and Profibus and Profinet in particular, is the diagnostic information.