The Modbus module with 4 digital inputs and 2 relay outputs with a manual control level has been designed for decentralized switching tasks. It is suitable for integrating light switches and window contacts in a room and for controlling 2 light strips or as a blind control. Additionally, it can control 2 motor-operated fire dampers. The relay contacts must be protected by appropriate load-dependent measures. The inputs can be operated as contact or voltage inputs. Through a Modbus master, the inputs and outputs can be switched and queried via standard registers. The settings for the module address, bitrate, and parity are made using 2 switches on the front or via software. The module is suitable for decentralized mounting on TH35 mounting rails according to IEC 60715 in electrical distribution boards. The connection is made using screw terminals.