Siemens alarm 22040: [Channel %1: ] Block %3 spindle %2 is not referenced with zero marker

What it means

Position-controlled spindle functions such as rigid tapping or thread cutting require the spindle measuring system to be referenced to a zero mark. The command was refused because the spindle encoder reference is missing.

Likely causes

• spindle encoder provides no zero mark (contamination, defect)
• spindle referencing never performed since power-on
• reference mode/machine data for the spindle encoder inconsistent (MD 30240/34200)
• zero mark lost after encoder or cable work without re-referencing

Replacement parts

We supply the following units for this alarm — tested, warranty-backed:

• 6FX2001 series spindle encoder

  encoder · Common cause

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• 6FX5002 series encoder signal cable

  cable · Common cause

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