Arrangement having two redundant modules

An arrangement comprising:

• a first module;
• and a redundant, second module, the first module and the redundant, second module operatively monitoring one another mutually;
• wherein the first module and redundant, second module each includes:
• a current source or voltage source, which is one of (i) switchable on and off and is connected via a first current sensor to a first line terminal of a respective module of the first module and redundant, second module and (ii) connected to a first line terminal via a series circuit formed by a first controllable switch and a first current sensor;
• and
• a second line terminal and aground terminal, between which is operatively connected a second current sensor in series with a second controllable switch;
• wherein the first line terminal of the first module is connected via a first line to the second line terminal of the second module, and the first line terminal of the second module is connected via a second line to the second line terminal of the first module;
• and
• wherein the first module and redundant, second module are, when in a functioning state, configured to switch on its current source or voltage source and further configured to one of (i) close the second controllable switch contained in said respective module of the first module and redundant, second module and (ii) close the first and second controllable switches contained in said respective module of the first module and redundant, second module;
• wherein the first module and redundant, second module each additionally include:
• a monitoring device connected to the first and second current sensors contained in said respective module of the first module and redundant, second module, said monitoring device generating a monitoring signal which identifies a corresponding other module of the first module and redundant, second module as functioning if at least one of the first and second current sensors detects a current flow.