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If even one wire were out of place, or one relay failed, the whole system would become faulty. Changes would require rewiring and careful updating of the documentation. The hard-wired nature made it difficult for design engineers to alter the automation process. Before, control logic for manufacturing was mainly composed of relays, cam timers, drum sequencers, and dedicated closed-loop controllers. PLC originated in the late 1960s in the automotive industry in the US and were designed to replace relay logic systems. 8 PLC compared with other control systems.Since then, they have been widely adopted as high-reliability automation controllers suitable for harsh environments.Ī PLC is an example of a hard real-time system since output results must be produced in response to input conditions within a limited time, otherwise unintended operation will result.
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PLCs were first developed in the automobile manufacturing industry to provide flexible, rugged and easily programmable controllers to replace hard-wired relay logic systems. Programs to control machine operation are typically stored in battery-backed-up or non-volatile memory. They can be designed for many arrangements of digital and analog I/O, extended temperature ranges, immunity to electrical noise, and resistance to vibration and impact. PLCs can range from small modular devices with tens of inputs and outputs (I/O), in a housing integral with the processor, to large rack-mounted modular devices with thousands of I/O, and which are often networked to other PLC and SCADA systems. Dick Morley is considered as the father of PLC as he had invented the first PLC, the Modicon 084, for General Motors in 1968.
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When you get support, it is from an engineer who had a hand in the product’s development, and support doesn’t require a ticket or 24-hour wait.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. When you talk with sales, you will get honest answers and recommendations. When you call, a live person answers the phone. While there are certainly other companies offering protocol gateways, there is no one who provides the level of support and service that you receive from RTA. Why Use Real Time Automation as a Gateway Supplier? Each data mapping you apply can be modified with up to 3 mathematic functions. Need to modify your data as it passes from one protocol to the other? No problem. Those locations are mapped to corresponding memory block addresses in your S7 PLC. You allocate two blocks of tag/register in your Allen-Bradley PLC. There is no polling from the PLC or EtherNet/IP scan lists to arrange. With the 460ETCSC you are making a direct connection between S7 PLC data and user-defined Tags or Registers in the data table of your Allen-Bradley PLC. The 460ETCSC connects up to 5 Allen-Bradley PLCs to 5 Siemens S7 PLCs. Connect Allen-Bradley PLCs to your S7 PLCs