Siemens alarm 400604: Set change with M06 in the machine data
SINUMERIK PLC system alarm · Siemens 840D/810D powerline
What it means
For the configured magazine type (box or chain magazine) tool changing may only be executed with M06, but channel machine data allow another change behaviour. The alarm asks for the channel-specific TOOL_CHANGE_MODE (MD 22550) to be set to 1 so the NC matches what the magazine mechanics support. It is a configuration-consistency check around tool change, not a hardware fault.
Likely causes
- MD 22550 TOOL_CHANGE_MODE != 1 although a box/chain magazine is configured
- Magazine type changed in tool management setup without adapting MD 22550
- Impermissible setting also possible for turret magazines per Siemens note
Triage note: Reaction: alarm display only; program continuation internal.
Need the part urgently?
Send us alarm 400604 with your machine details — typical RFQ turnaround is 24–48h.