In its minimum configuration the telecontrol system consists of a master station and an outstation, in which each station needs at least one basic module. In order to increase the I/O scope each basic module can be fitted up to a maximum of 15 expansion modules, which are connected via the CAN bus interface. Each I/O module is given a module number. Thus data is exchanged between modules with the same module number. The physical arrangement of the modules within the system is not significant. The data exchange is event- and time-controlled. In the case of digital I/O modules the inputs/outputs 1-4 can be switched-over between the two types of functions - static or counting/momentary pulses, whereas analog signals can be transmitted both as voltage values 0-10 V or as current values 0-20 mA. If a fault occurs, the system detects the faulty communication and reports it via LED and a relay contact both in the master station and the respective outstation. When using appropriate I/O modules a binary contact can be used additionally to signal availability of all connected stations at any point of the telecontrol system. After the cause of the fault has been removed, normal operation is resumed automatically. The MFW power line telecontrol system uses a very safe carrier frequency process for signal transmission and is therefore suitable for applications in rough problematic industrial environments. The MFW is able to bridge distances of several kilometers. The MFW power line telecontrol system operates as standard with a carrier frequency of 109.4 kHz. The transmission network can be designed as a star, ring or tree system.