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Code 22045: Block %2 spindle/axis %3 not available in channel %1 because active in channel %4

Issue Description & Safety Warning

The Siemens SINUMERIK 840D CNC has triggered a critical Block %2 spindle/axis %3 not available in channel %1 because active in channel %4 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 = Axis name, spindle number %4 = Number of the channel in which th e spindle/axis is currently active. Definitions: The specified spindle/axis is requi red in channel %1 for the correct execution of a function. The spindle/axis is currently active in the %4 channel. The constellation can only occur with replacement axes. Problem case: A synchronized spindl e coupling was programmed. The master spindle/axis is not contained in the channel programmed for the coupling at the time the coupling is activated. The master spindle/axis can be moved by FC18 or synchroni zed actions. When using FC18, please note that the master spindle/axis must be assigned to the channel which activates the coupling. When FC18 terminates, the master spindle/axis must not be assigned to another channel via PLC while the coupling is still active (VDI interface signals). Reaction: Interface signals are set. Alarm display. NC Stop on alarm. Remedy: - Program a GET for the master spindle/axis in the NC program before activating the coupling, or - Assign the master spindle/ axis to the channel that activated the coupling via PLC. Program Continuation: Clear alarm with the Delete key or NC START.

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 22045 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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