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It was the first multifunctional time-delay relay, and due to its purely electromechanical basis, is still used in many ways. Electromechanical (and later electronic) time-delay relays made “Schleicher Relais Werke” internationally known. [3] [4] In 1976, Schleicher developed and marketed a programmable controller (PLC).
A programmable load is a type of test equipment or instrument which emulates DC or AC resistance loads normally required to perform functional tests of batteries, power supplies or solar cells.
A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
1 controller/driver for 16k/64k/256k dRAM 48 SN74S408: 74x409 1 controller/driver for 16k/64k/256k dRAM 48 SN74S409: 74x410 1 64-bit RAM (16x4) with output register three-state 18 74F410: 74x411 1 FIFO RAM controller 40 74F411: 74x412 1 multi-mode buffered 8-bit latches (equivalent to Intel 3212/8212) three-state 24 SN74S412: 74x413 1
The use of relays for the logical control of complex switching systems like telephone exchanges was studied by Claude Shannon, who formalized the application of Boolean algebra to relay circuit design in A Symbolic Analysis of Relay and Switching Circuits. Relays can perform the basic operations of Boolean combinatorial logic.
When used to control reactive (inductive or capacitive) loads, care must be taken to ensure that the TRIAC turns off correctly at the end of each half-cycle of the AC in the main circuit. TRIACs can be sensitive to fast voltage changes (dv/dt) between MT1 and MT2, so a phase shift between current and voltage caused by reactive loads can lead to ...