Siemens alarm 20007: [Channel %1: ] Axis %2 reference point approach requires 2 measuring systems

What it means

The configured referencing method for this axis needs both measuring systems (motor encoder plus second/direct measuring system), but the second system is missing or unusable. Dual-system referencing is typically used where the direct scale must be aligned to the motor encoder.

Likely causes

• second encoder (direct scale) not connected or defective
• second encoder set to simulated (MD 30240[n] = 0) although referencing mode demands it
• second measuring system not yet referenced/synchronized
• encoder input module or its cabling faulty

Replacement parts

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

• linear/direct measuring system (per machine spec)

  encoder · Check if others ruled out

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