Heidenhain 203 alarm: Faulty emergency stop

The system detects an internal or external fault in the emergency stop circuit. It is an alarm from the Safety area, and in the catalog it is listed as “Faulty emergency stop”. On the machine you notice it like this: It will not allow enabling, Persistent security error, It may not release even after resetting.

On the shop floor it almost always comes from one of these causes: Defective relay/safety, Cableado de E-stop, Contacto cruzado, Security module. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Do not operate until the circuit is repaired and validated. Resetting without fixing the cause first only hides the problem: Heidenhain 203 trips again and, in the meantime, you keep working with the machine in bad shape.

With the machine stopped and in a safe state, start with these checks: Do not bypass the safety circuit, Anotar estado de entradas PLC, Request electrical inspection. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Heidenhain 203 active, avoid this: Do not bypass safety devices, Do not manipulate energized electrical cabinet, Do not continue producing if the alarm reappears. Skipping any of these points is what turns a minor stop into an expensive breakdown.

Siempre: afecta seguridad funcional. If you are not sure how far it goes, stop the machine and report it: a repeat alarm always works out cheaper than a crash.

It is critical: there is a real risk of damage to the machine, the tool or a person. Leave the machine stopped, do not keep resetting it to see if it goes away, and call maintenance before producing again. Guidance reference. Always confirm the full text in the exact machine/control manual.