Due to the expansion modules the amount of analog and digital I/Os of the MFW basic mod-ule can be extended. Through the bus cable, which is in the scope of supply, on one of the two CAN-bus sockets the connection can be done, whereas the second socket is used to connect another module or for test purposes. The power of the modules is supplied over the CAN-bus. Furthermore the configuration of the modules is simply done by the DIP switch.