The invention relates to a plug-in communication module (1) and a method for communicating using a plug-in communication module (1) to simplify the communication interfacing of assemblies and devices. A communication module (1) is proposed with means (2) for storing and executing software components (3, 4, 5) with communication functionality, with first connection means (7) for direct electrical and mechanical coupling to interfaces (8) of at least a first assembly (9), with access means (6) for accessing local communication means (10) of the first assembly (9) and with second connection means (11) for electrical coupling to interfaces (12) of at least a second assembly (13). Advantageous embodiments relate in particular to a communication module, with which at least one of the software components (3, 4, 5) is provided to execute communication tasks using Internet technologies and/or at least one of the software components (3, 4, 5) is a Web server or is provided to execute Web services.