The module is used to control a 3-speed fan. The basic operation of the fan was modelled on the operation of air conditioning systems for vehicles.

Manual mode: Following release, the user can directly specify the fan speed (values 1-3 at Input 2) or can switch off the fan directly (1 signal at Input 5). In addition, it is possible to switch between the fan speeds 1-3 and Fan Off as desired via the inputs Speed + or Speed –.

Automatic mode: Automatic mode is activated via Input 6 and set to the specified fan speed via Input 7. When automatic mode is activated, a 1 signal on the inputs Speed –, Speed +, the input "Switch off" or the direct speed specification results in switching over to Manual mode. After another main release, the operating mode (speed) is active before the lock-out is active. To illustrate the processes, the module contains not only the 1-bit status outputs, but also a 1-byte output. The values sent via this output can be converted into fixed texts by means of comparators.