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Siemens SINUMERIK Controller
Spindle · Intermediate · 30-120 minutes
Siemens 840D 22045 - Block spindle/axis not available in channel because active in
Alarm 22045 occurs when a spindle or replacement axis required in the current channel is already actively allocated to a different channel. This typically happens during synchronized spindle coupling operations where the master spindle needed for synchronization is engaged in another channel's process, preventing dual-channel resource sharing.
22045
Siemens 840D 22045 - Block spindle/axis not available in channel because active in
Block spindle/axis not available in channel because active in
The specified spindle/axis is required in channel for the correct execution of a function. The spindle/axis is currently active in the channel. The constellation can only occur with replacement axes. Problem case: A synchronized spindle coupling was programmed. The master spindle/axis is not c
Root Cause Summary
Alarm 22045 occurs when a spindle or replacement axis required in the current channel is already actively allocated to a different channel. This typically happens during synchronized spindle coupling operations where the master spindle needed for synchronization is engaged in another channel's process, preventing dual-channel resource sharing.
Safety
- Refer to Siemens documentation
- Ensure qualified technician performs repairs
Causes and Fixes
- 1
Check the active channel allocation: Navigate to Diagnostics > Channels > Channel Status in the operator panel. Verify which channel currently owns the spindle and confirm it matches channel %4 from the alarm message.
- 2
Review the NC program block %2: Identify the G-code line attempting to use the spindle. Verify the spindle number matches the hardware configuration in MD 20070 (SPINDLE_ASSIGNMENT) and confirm no M-codes (M03/M04/M05) are active in the competing channel.
- 3
Inspect channel synchronization settings: Check MD 20085 (SPINDLE_COUPLE_MODE) and MD 20084 (COUPLE_SPINDLE_AXIS) to confirm spindle coupling parameters. Ensure the master spindle is not locked in a synchronized state with channel %4.
Do not modify MD values while machine is running; use offline mode only.
- 4
Reset the alarm by stopping the competing channel: Issue M05 (stop spindle) in channel %4 and allow spindle to coast/brake, then retry the block in channel %1. If alarm persists, perform a soft reset (NC Stop > NC Start cycle).
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