Heidenhain 182 alarm: External emergency stop

The Control-Is-Ready input or external emergency chain is inactive. It is an alarm from the Safety area, and in the catalog it is listed as “External emergency stop”. On the machine you notice it like this: Does not enable machine, E-stop or safety active, May appear at start-up.

On the shop floor it almost always comes from one of these causes: E-stop button or door, Safety relay, Drive not ready, Cableado de cadena de emergencia. Rule out the most likely one on your machine first, before touching parameters or swapping anything.

Reset security and reset according to OEM. Resetting without fixing the cause first only hides the problem: Heidenhain 182 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: Release mushrooms and close protections, Review PLC diagnosis, Consult electrical diagram if it persists. That alone will tell you whether it is the program or whether you need to raise a maintenance job.

With Heidenhain 182 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.

If the chain does not release or there is a fault in the safety circuit. 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 a stop alarm: the cycle will not continue until you fix the cause. It does not always mean serious damage, but it leaves the machine where it is and you have to check it before running again. Guidance reference. Always confirm the full text in the exact machine/control manual.