Code 26284: [Channel %1: ] Block %2: The call of the function / procedure %3 is only permissible if the function 'C ollision monitoring' is present.
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2: The call of the function / procedure %3 is only permissible if the function 'C ollision monitoring' is 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
Parameters: %1 = Channel number %2 = Block number, label %3 = Funktionsname Definitions: The function or procedure stated in the alarm text (e.g. PROTA or PROTD) can only be called if the function "Collision avoidance" is present. Reaction: Correction block is reorganized. Alarm display. NC Stop on alarm. Remedy: The function "Collision avoidance" mu st be activated. For this, the MD18890 $MN_MM_MAXNUM_3D_PROT_AREAS must contain a value greater than zero. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program. Diagnostics Manual (DAsl), 03/2009
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 26284 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.
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