Code 201507: <location>BICO: Interconnections to inactive objects present
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical <location>BICO: Interconnections to inactive objects present alarm. Immediate attention from a qualified operator or maintenance technician is required to prevent secondary damage to the equipment or spoiled parts during the manufacturing cycle. Always ensure standard safety and LOTO procedures are followed before accessing electrical cabinets.
Official Troubleshooting Steps
Message value: %1 Drive object: All objects Reaction: NONE Acknowledge: NONE Cause: There are BICO interconnections as signal sink from a drive object that is either inactive/not operational. The BI/CI parameters involved are listed in r9498. The associated BO/CO parameters are listed in r9499. The list of the BICO interconnections to other driv e objects is displayed in r9491 and r9492 of the deactivated drive object. Note: r9498 and r9499 are only written to, if p9495 is not set to 0. Alarm value (r2124, interpret decimal): Number of BICO interconnections found to inactive drive objects. Remedy: - set all open BICO interconnections centra lly to the factory setting with p9495 = 2. - make the non-operational drive object active/operat ional again (re-insert or activate components).
Source: SINUMERIK 840D sl / 840Di sl / SINAMICS S120 Diagnostics Manual (DAsl, 03/2009)
Last reviewed: 2026-07-01 · Verified against the manufacturer’s official documentation.
About Siemens SINUMERIK 840D CNC Alarms
Siemens controllers include extensive self-diagnostics that flag or halt the machine when a fault is detected. Error code 201507 on the SINUMERIK 840D CNC identifies one specific fault condition — its documented cause and the official corrective steps are listed above, sourced from Siemens's service documentation. Always confirm against the manual for your exact machine configuration and follow LOTO procedures before servicing.
Complete Alarm List: 4014 Siemens SINUMERIK 840D CNC codes.
Have a better solution?
Help the industrial community by sharing your repair experience for code 201507.
Need a searchable reference for more Siemens SINUMERIK 840D CNC manuals?
We structure equipment manuals into searchable code, title, cause, solution, safety note, and source-reference data. Send a PDF and example searched codes when you need public pages, private search, or structured exports.
Space reserved for Google AdSense / Industrial Affiliate Links
Monetization target for 2026