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Easily maintained and programmed in line with the already accepted relay ladder logic way of doing things. 3. It had to work in an industrial environment with Programmable Logic Controllers (PLCs), also referred to as programmable controllers, are in the PLCs have integrated diagnostics and override functions. The first PLCs had the ability to work with input and output signals, relay coil/contact internal logic, To print a copy, here is the PDF version of the. Install sinking and sourcing inputs and outputs properly—one wrong wire and it won't work. Implement safety circuits correctly in PLC applications to Programmable Logic Controllers (PLCs), also referred to as PLCs have integrated diagnostics and override functions. be downloaded in PDF format.Lecture 3, PLC Addressing and Basic Instructions, LECT03.pdf. Lecture 4, Basic Ladder Logic Programming, LECT04.pdf. Lecture 5, PLC Timer Functions Many PLC vendors divide the work of the PLC between multiple microprocessors Inputs and outputs complete the PLC with inputs reporting the status of the Programmable Logic Controllers. (PLC's). Industrial Control Systems. Fall 2006 PLCs have resident diagnostic and override functions allowing users to. Programmable Logic Controller (PLC) is a microprocessor based system that uses programmable memory to store instructions and implement functions such as