Phoenix Contact Gmbh + Co. Kg

Hans-Peter Hudetz

Elmar Schaper

Udo Haumersen

Alexander Rasche

Circuitry for fuse failure display for monitoring the trip status of a fuse is disclosed, wherein a light-emitting diode is provided in order to display the trip status of the fuse, which light-emitting diode is arranged in a current path parallel to the fuse. If the fuse is not tripped, the parallel current path has a high resistance in relation to the resistance across the fuse, such that the current across this current path is insufficient for operation of the light-emitting diode. If the fuse is tripped, this parallel current path has a low resistance in relation to the resistance across the fuse, such that the current across this current path is sufficient for operation of the light-emitting diode, wherein a current-limiting device for limiting the current across the light-emitting diode and a voltage-limiting device for limiting the voltage across the tripped fuse are also provided.

Fuse failure display

The invention relates to a control and/or data-transmission system comprising a number of I/O modules connected in series one adjacent to the other and a control and/or data-transmission module, as well as a control and/or data-transmission module for controlling I/O modules for such a control and data-transmission system. The invention proposes a control and data-transmission system that comprises a number of I/O modules connected in series one adjacent to each other, wherein each I/O module comprises at least one I/O signal channel and also at least one first signal terminal for connecting the I/O signal channel to a data bus and at least one second signal terminal for connecting a bus subscriber to the I/O signal channel, and wherein the system comprises a control and/or data-transmission module that comprises control electronics for the selective control of the number of I/O modules and that forms a detachable unit.

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Hameln, Germany

Hans-Peter Hudetz