Code 26252: [Channel %1: ] Block %2: Element %4 of the protection area group %3 is not linked with a kinematic chain
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2: Element %4 of the protection area group %3 is not linked with a kinematic chain 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 = Index of 1st protection area group %4 = Index of 2nd protection area group Definitions: Protection areas being elements of a protection area gr oup must be linked with a kinematic chain. Protection areas that are not assigned to any kinematic chain are not relevant for collision monitoring, because their position in th e space has not been defined. Reaction: Correction block is reorganized. Interface signals are set. Alarm display. Remedy: Defining the assignment of a protection area to a kinematic chain. Deleting the protection area from the protection area group. Program Continuation: Clear alarm with NC ST ART or RESET key and continue the program.
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 26252 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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