There is disclosed a base band signal generation device and others for processing transmission data so that a reception side can restored the data without recognizing whether the data has been subjected to a processing and transmitting the data with an appropriate efficiency corresponding to the communication quality. A memory is provided, in which safety-relevant data of the stored-program control is stored, which is accessible to the controller. When the hoop is open, the free ends thereof are separated by a distance \u0394.