12 – 162 HEIDENHAIN Service Manual iTNC 530 HSCI
12.2 PROFIBUS
12.2.1 Introduction
îš„ The iTNC 530 HSCI also cooperates with PROFIBUS components.
îš„ For this purpose, the MC must feature a PROFIBUS interface board.
îš„ PROFIBUS components are available from HEIDENHAIN or other manufacturers.
îš„ The machine manufacturer configures the PROFIBUS system.
The described PROFIBUS diagnosis may facilitate troubleshooting.
For troubleshooting the PROFIBUS system of your machine, always contact the machine
manufacturer!
12.2.2 Possible error causes
îš„ Fault in the PROFIBUS
îš„ Fault in a bus (e.g. ASI bus) connected to the PROFIBUS
îš„ Terminating resistors missing at the ends of the PROFIBUS
îš„ Defective cable or connector
îš„ Defective device
îš„ PLC power supply missing
îš„ PROFIBUS interface of the MC defective
îš„ Poor shielding and grounding
îš„ Electromagnetic fields
îš„ Compensating currents caused by different potentials
Example:
Several electrical cabinets are connected with a bus.
Due to poor grounding, these cabinets do not have the same potential.
The shielding of the bus is connected to each electrical cabinet.
Result: Compensating currents
Special line testers and analyzers on which the service engineer has been trained are very helpful
at any rate for troubleshooting PROFIBUS systems.
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