Early PLCs have been made to replace relay logic units. These PLCs were programmed in "ladder logic", which strongly resembles a schematic diagram of relay logic. A programmable logic controller, PLC, or programmable controller is a digital Computer system employed for automation of usually industrial electromechanical procedures, such as Charge https://bamboo-sheets13333.qowap.com/63671943/getting-my-power-supply-modules-to-work