Patent ID: 6959402

Claim:
A computer device with a safety function for avoiding non necessary disconnection of the computer device, comprising processor means; an ordinary memory unit connected to said processor means and arranged to store at least one application program that is executed by the processor means; a supervisory unit that supervises the function of the computer device and that is arranged to, in case an error occurs, send a restart signal or a stop signal to the processor means, characterised by a further memory unit that is arranged to store at least some basic instructions in the form of instructions of the at least one application program that control a system or a part of a system that is controlled by the computer device, wherein the computer device is arranged such that the processor means, at a restart generated by said restart signal from the supervisory unit is connected to the further memory unit and reads and executes the basic instructions that are stored in the same, while the ordinary memory unit is disconnected from the processor means, and wherein said further memory unit is arranged to be write protected at least when the computer device is in operation.