Telecontrol system

Claim 1

A telecontrol system with at least one master station and a plurality of substations connected to the master station via data transmission units, each substation containing a control unit equipped with a microcomputer and a plurality of plug-in interface modules connected to the control unit and serving to enter messages and measured values and to deliver commands, wherein said interface modules are equipped with microcomputers, and that both the control unit and all interface modules of a substation have interfaces to, and are interconnected by, a serial data bus permitting the use of protection coding techniques wherein each interface module has a first subcircuit which includes said microcomputer, and is coupled to said control unit by a serial data bus over which said interface module is cyclically scanned for temporarily stored messages; and a second subcircuit for providing isolation between said interface module and a facility to be monitored, and wherein said first subcircuits in all interface modules are of the same design and contain, besides the microcomputer with main memory and program memory and the interface to the serial data bus, a function-code memory in which the function of the respective interface module can be fixed by coding, and wherein said second subcircuit includes all components necessary for adaptation to the technical facility to be monitored and controlled.