Sinumerik Alarm 6406 Channel %1 PLC acknowledge for command %2 is missing
%1 = Channel ID
%2 = Command no.
There is still no acknowledgement from the PLC for the tool change. The NCK cannot continue processing until it receives this acknowledgement for the specified command number. Possible command number values are described for alarm 6405.
– Alarm display.
– Interface signals are set.
– NC Start disable in this channel.
Please inform the authorized personnel/service department.
• Erroneous PLC communication: Correct the PLC program.
• It is possible to release NCK with the PLC command 7 from the wait condition.This aborts the waiting command.
Clear alarm with the RESET key. Restart part program
- Siemens Diagnostics Guide by Siemens