Analog TECHNIQUE
The development in the last years has shown us, that you can't get around analog technique in building automation. In certain applications the low priced and reliable analog controllers are by far better than the digital controllers.
That's why R+S has revised the analog controllers and is still offering a wide range of low priced, easy to handle controllers for simple applications. Or you can use the famous module system to controller more sophisticated systems
Compact Controllers
Module Controllers