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Siemens alarm

10720 Software Limit Switch

The programmed end position is past an axis's software limit.

Usually an operator fixSiemens SINUMERIK 840D sl, 828D and 840D powerline

What it means

The programmed end position is past an axis's software limit. The control refused the move.

Common causes

  • Wrong work or tool offset
  • Program error
  • Reference point lost

What to check first

  1. Check the block and offsets
  2. Jog back and reset
  3. Check the reference point

Lock out the machine before reaching into it. Never bypass a door switch or interlock to clear an alarm.

When to call a repair tech

Usually an operator fix. Call a tech if limits or the reference point seem wrong.

Repair companies that work on Siemens

See all Siemens repair

Quick answers

What does Siemens alarm 10720 mean?

The programmed end position is past an axis's software limit. The control refused the move.

What causes Siemens alarm 10720?

Wrong work or tool offset. Program error. Reference point lost.

How do I fix Siemens alarm 10720?

Check the block and offsets. Jog back and reset. Check the reference point. Usually an operator fix. Call a tech if limits or the reference point seem wrong.

Alarm numbers and text can differ by control model, software version and machine builder. This page is a starting point from people who have worked on these machines, not a replacement for your machine builder's manual.

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