The LOGO! CMK2000 KNX module communicates via Ethernet with LOGO! 8. It transmits sensor data from KNX bus nodes to the logic module, where they are combined with logic functions. LOGO! control commands are transmitted to KNX actuators via the communication module. 50 KNX communication objects can be configured, and linked in the LOGO! program with counters, setpoints, and parameters to create automation solutions.

LOGO! 8 also makes its own functionality available to the other KNX nodes via the LOGO! CMK2000 communication module. There are 24 digital inputs, 20 digital outputs as well as 8 analog inputs and outputs in the maximum hardware configuration. LOGO! 8 also enables the date and time to be synchronized for the nodes in the KNX system.