HEIDENHAIN iTNC 530 HSCI - Profibus; Introduction; Possible Error Causes

12 – 162 HEIDENHAIN Service Manual iTNC 530 HSCI
12.2 PROFIBUS
12.2.1 Introduction
 The iTNC 530 HSCI also cooperates with PROFIBUS components.
 For this purpose, the MC must feature a PROFIBUS interface board.
 PROFIBUS components are available from HEIDENHAIN or other manufacturers.
 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
 Fault in the PROFIBUS
 Fault in a bus (e.g. ASI bus) connected to the PROFIBUS
 Terminating resistors missing at the ends of the PROFIBUS
 Defective cable or connector
 Defective device
 PLC power supply missing
 PROFIBUS interface of the MC defective
 Poor shielding and grounding
 Electromagnetic fields
 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
Note
Special line testers and analyzers on which the service engineer has been trained are very helpful
at any rate for troubleshooting PROFIBUS systems.