Siemens SIMATIC NET PROFIBUS manual 6ZB5530-3AC30-0BA1 Infrared Link Modul ILM

6ZB5530–3AC30–0BA1 Infrared Link Modul (ILM)

If no display indicates an error and communications problems nevertheless occur, check the parameters set on both PROFIBUS nodes. You should also check the electrical RS 485 wiring. The most common cause of problems is activating or deactivating the terminating resistor incorrectly. You should also check that the cable shields at the ends of all PROFIBUS cables and all shielded power supply cables are making satisfactory contact.

Note

Remember that sporadic data errors on the cable network are not detected by the PROFIBUS ILM. The PROFIBUS ILM cannot check the contents of frames but can only monitor the basic functions and optical transmission quality.

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