PROFIBUS segment length and baud rate: the table you actually need
Maximum PROFIBUS segment length at every DP baud rate on type A cable, with repeater rules, termination values and the meter checks that find the fault.
Bus Termination
DeviceNet Troubleshooting
DeviceNet troubleshooting from the design rules out: 121 ohm termination at each trunk end, one grounding point, and a supply sized for the drops.
Profibus Faults, Network Problems Causes/Solutions, Profibus Faults Issues
Profibus faults and what each is telling you: bus errors, station failures, the terminator nobody switched on, the shield earthed at both ends.
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