Profibus Troubleshooting Guide4/18/2021
Termination should be activatedplaced at both ends of every bus segment.By inspecting the signals all kinds of problems can be identified, like: short-circuits, wire breaks, missing terminations, extra terminations, EMC and bad electrical interfaces in the devices.Handling the oscilloscope requires some training, but this will be nothing compared to time and money you will safe during troubleshooting and commissioning.
The devices in that area will NOT get damaged The short-circuit can easily be detected with an oscilloscope and even the distance to the problem can be measured. If the end-user wants to keep the installation running during a short-circuit he can pick the following solutions. What they do not know, is that it has to be activated again when you are using repeaters, OLMs or Profihubs. Every segment has to be terminated This often slips in when people are using lots of fibre optic and there is only a short length of copper cable in the cabinets. ProfiTrace 2 is a Combi-Analyzer that has both tools integrated. The multi-meter is NOT useable for signal analysis It will only be used to check a connection between 2 points. But, this did not protect the PROFIBUS signals well enough due to pig-tails and ferrules. The shield should be covering the wires and not be buried in the wires (A-B line). The current difficulty is that still lots of connection materials out there are based on pin 5. The user has to verify this, because connection materials are not certified. ![]() It should contain a list of devices that can be used with this product. Of course, these are only the devices from this manufacturer. ALS176 has min.12-30 kOhm). In theory this should not cause any problems which have not been detected so far. The actual answer lies in the electronic components of the repeater. The digitalization from and to the opto-couplers in the repeater will make bits smaller or wider. If you put too many repeaters in series, the bits differentiate too much and messages are not recognized anymore. There are also repeaters available with no limit in serial placement. Profibus Troubleshooting Guide Manual Of TheCheck the manual of the repeater It should state the maximum amount. If you put a large quantity of repeaters in series you might have to change the Tslot busparameter to a higher value. The higher the baudrate and the longer the cable, the more important termination becomes.
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