FastCAT IO is the head of rack system designed for mounting on a standard DIN-Rail with proprietary MTBus. The module is an EtherCAT slave which converts the passing telegrams from EtherCAT to MTBus; it can manage up to 16 I/O modules. The rotary switch allows to assign an ID to the coupler on the EtherCAT bus.The network is connected via the two RJ45 EtherCAT interface.