Code 21619: [Channel %1: ] Block %2 transformation active: motion not possible
Issue Description & Safety Warning
The Siemens SINUMERIK 840D CNC has triggered a critical [Channel %1: ] Block %2 transformation active: motion not possible 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 Definitions: The machine kinematics does not allow the specified motion. Tr ansformation-dependent error causes can be in: TRANSMIT: A (circular) area exists around the pole, where positioning is no t possible. The area is caused by the fact that the tool reference point ca nnot be traversed as far as into the pole. The area is defined by: - the machine data (MD249.. $MC_TRANSMIT_BASE_TOOL_...) - the active tool length compensation (see $TC_DP..). Whether the tool length compensation is incl uded in the calculation depends on the working plane selected (see G17,..). The machine stops at the edge of the area where positioning is not possible. Reaction: Local alarm reaction. NC Start disable in this channel. Interface signals are set. Alarm display. NC Stop on alarm. Remedy: Modify part program. Change the incorrectl y specified tool length compensation. Note: RESET alone is not enough if transformation also remains active during RESET. 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 21619 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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