Compact binary input with four channels for controlling lights, blinds, etc. with conventional switches or contacts. The inputs are suitable for potential-free contacts. It can also be used as a pulse counter. This means, for example, energy meters with S0 output or wind meters can be connected. Two buttons and three LEDs enable local operation and visualization of the device status. In addition to the input channels, the device contains 16 independent logic or timing functions. The device is powered via the KNX bus and does not require an external power supply. Sales unit: 1 ST.