The LPM lamp test modules are for the detection and decoupling of group status messages. They serve as visual indicators of the switching or signal status. The LPM-K modules feature diodes which are connected in pairs on the cathode side. They are freely-switchable on the anode. On the modules, the diodes are connected in pairs on the cathode side. One anode from the connected pair is connected to a common collection point with the other anodes.
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