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A PLC control system and a relay control system are comprised of an input, output, and control section.The book covers:-Switching mechanisms-Relays, Relay Logic & Relay Ladder logic-Timers, Counters, and Sequencers as applied in Relay controls-PLC-basic introduction-PLC hardware-PLC operation-PLC memory structure-PLC programming-Ladder gates-Ladder logic-Ladder diagram programming and its industrial control application-Timers, counters and sequencers as applied in PLC systems-Lastly I discuss briefly how PLCs are connected in a network