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plc primer
A PLC Primer.pdf
November 8, 2009 · Filed Under Electrical Engineering · Comment · Tags: PLC, Programmable Logic Control
Taken from Why Use PLC: The softwiring advantage provided by programmable controllers is tremendous. In fact, it is one of the most important features of PLCs. Softwiring makes changes in the control system easy and cheap. If you want a device in a PLC system to behave differently or to control a different process element, all you have to do is change the control program. In a traditional system, making this type of change would involve physically changing the wiring between the devices, a costly and time-consuming endeavor.
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