Smart Relays and PLC's

(a.k.a. programmable logic controller, programmable relay, programmable controller, relay logic system)

The basics: a PLC receives information from the input side (sensors and other devices), processes this data and then sends outputs based on parameters it has been programmed for. Smart relays are a simplified, lower cost option that can be programmed from the unit or through a computer. Smart relays can replace a number of relays and timers and can also be re-programmed and reused on different applications.
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