Siemens SINUMERIK 840D Diagnostics Manual page 682

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Clock cycle came too early

The NC basic cycle, which is generated on the NC and transferred to the drive via the

drive bus cable, has supplied a pulse, which does not match the clock timing.

Possible causes: EMC interference on drive bus, NC hardware error, hardware error on

the control module.

Check the drive bus cable and cable connections, perform remedial measures (check

shielding or ground connection). Replace the NC hardware, replace the control module.

Illegal Opcode, Trace, SWI, NMI (DSP)

Incorrect address

The processor has detected an illegal command in the program memory.

Replace the control module.

Error in checksum test

As of Version 4.0: Segment of the faulty code / data area, whereby:

0: P: memory

1: X: memory

2: Y: memory

A difference has been detected between the setpoint and actual checksums during con-

tinuous testing of the checksum.

The cause is probably a hardware error on the control module.

Replace the control module.

SSI interrupt

An illegal processor interrupt has occurred.

The cause is probably a hardware error on the control module.

Check the drive bus cable and cable connections. Replace the control module.

SCI interrupt

An illegal processor interrupt has occurred.

The cause is probably a hardware error on the control module.

Check the drive bus cable and cable connections. Replace the control module.

SINUMERIK 840D/840Di/810D Diagnostics Guide (DA), 10.04 Edition

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