Telecommunication Power Supply with Programmable Logic Control

Programmable logic control (PLC) microprocessors are designed to take the place of hard-wired relay and contactor-control assemblies. Among the multiple advantages offereo are a wider scope of task adaptation and protective devices, rapid functional testing with less instrumentation in a small space: and greater reliability and endurance following therefrom. These merits can of course be put tc good use in the telecommunicatior supply sector; this has already been realised by the German Federal Post authorities. The necessary multicontrol functions are here represented by a schematic hardware layout, and a simplified flowchart of operational states. These introduce the requisite tasks of process control, and the programmable logic exercised by the central microprocessor. Operating experiences made in talcom power supply, and distribution engineering, are outlined.