11 – 118 HEIDENHAIN Service Manual iTNC 530 HSCI
11.2 Error messages
See “Error messages” on page 4 – 21.
PLC error messages (text, reaction of the control, etc.) are defined by the machine manufacturer.
11.3 Possible error causes
General
information
PLC power supply missing
Overload, short-circuit on an output
Defective PLC input at the MC or the at PLC expansion card
Defective PLC output at the MC or at the PLC expansion card
Defective cables or connectors
Faulty clamp or screw connection
Bouncing switches (e.g. mechanical pushbutton switches)
Poor shielding and grounding
Electromagnetic fields
Fault in the PLC bus
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
Additionally
for PROFIBUS
Fault in the PROFIBUS
Fault in a bus (e.g. ASI bus) connected to the PROFIBUS
Terminating resistors missing at the ends
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