February 2012 12 – 147
12 Bus diagnosis
12.1 HSCI bus
12.1.1 Introduction
HSCI is the abbreviation of:
HEIDENHAIN Serial Controller Interface
The main computer (MC 6222, MC 6241), the controller unit (CC 61xx, UEC 11x) and other control
components (PLB 6xxx, MB 620) are connected to each other via the HSCI bus.
For further information refer to the annex of this Manual. --> See ”The HSCI bus” on page 1 – 648.
12.1.2 Possible error causes
Fault in the HSCI bus
Defective cable or connector
Defective device
PLC or NC power supply missing
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
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