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Siemens alarm

21612 Controller Enable Reset During Motion

The axis lost its controller enable while it was moving.

Stops the machineSiemens SINUMERIK 840D sl, 828D and 840D powerline

What it means

The axis lost its controller enable while it was moving. The drive was switched off in the middle of a move.

Common causes

  • E-stop or safety circuit opened during a move
  • Drive fault
  • PLC removed the enable

What to check first

  1. Look for the alarm that came with it
  2. Check E-stops and doors

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

If no other cause shows, a tech should look at the PLC and drive.

Repair companies that work on Siemens

See all Siemens repair

Quick answers

What does Siemens alarm 21612 mean?

The axis lost its controller enable while it was moving. The drive was switched off in the middle of a move.

What causes Siemens alarm 21612?

E-stop or safety circuit opened during a move. Drive fault. PLC removed the enable.

How do I fix Siemens alarm 21612?

Look for the alarm that came with it. Check E-stops and doors. If no other cause shows, a tech should look at the PLC and drive.

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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