Code 75016: [Channel %1: ] CLC: block %2 orientation changed for TRAFOOF
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] CLC: block %2 orientation changed for TRAFOOF 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 Definitions: 1. The 2D/3D clearance control has been switched of f before the transformation. The tool direction according to G17/G18/G19 has been applied as the c ontrol direction. Switching on the transformation with rotary axis settings that define a different to ol orientation requires an orientation step change and is therefore rejected. 2. The transformation has been switched off temporar ily (TRAFOOF) while clearance control is still active. When the transformation is switched on again, the tool orientation must be the same as when it was switched off, i.e. the rotary axes must not be moved while the transformation is deactivated. Reaction: NC Start disable in this channel. Alarm display. NC Stop on alarm. Remedy: Modify part program: Do not switch on the clearance control until the transform ation is already active or make sure that the required conditi ons relating to orientation are observed. Program Continuation: Clear alarm with the RESET key. Restart part 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 75016 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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