Siemens alarm 400264: Pointer parameter machine control panel 1 incorrect
SINUMERIK PLC system alarm · Siemens 840D/810D powerline
What it means
Within the FB1 parameter area for machine control panel 1 one of the configuration pointers (to the MCP interface data) is invalid, so the basic program cannot locate the panel's data structure. This is a commissioning/configuration error rather than a wiring failure. Correct the FB1 parameters and restart the control.
Likely causes
- FB1 MCP1 parameter block mis-entered during commissioning
- Pointer overwritten by later program edit or partial download
- Copy-paste error between MCP1/MCP2 parameter sets
Triage note: Same pattern applies to 400265 (MCP2), 400266 (handheld unit) and 400276/400277 (direct keys 1/2).
Need the part urgently?
Send us alarm 400264 with your machine details — typical RFQ turnaround is 24–48h.