The Electrician's Guide to PLC Systems: A Field and Classroom Guide for Electricians (Paperback) (ISBN-13: 9798188233402)

When a machine that runs on a PLC stops, the sophisticated part is almost never the problem. The trouble is in the signal, going in or coming out. Was it present, was it the right signal, was it at the right level, and did it arrive at the right time? Answer those four questions, in order, and you will rarely have any reason to suspect the processor at all.

The Electrician's Guide to PLC Systems is the field and classroom guide to the hardware side of programmable control, written in plain, first-person language for the electricians, mechanics, and technicians who keep automated equipment running, not for programmers. It is brand-agnostic and it stays on the hardware: the field device, the wiring, the I/O, the power, and the diagnostics that live in them. You will not write a single rung of ladder logic, and you will not need to.

• Read any PLC on sight: the I/O structure common to every platform, and what the lights are really telling you
• Discrete inputs made simple: sinking and sourcing, PNP and NPN, and wiring protective circuits to fail safe
• Analog inputs: the 4-20 mA current loop, the live zero, and how to prove a signal is stable
• The output path: relay, transistor, and triac outputs, inductive kickback, and how to protect them
• Power, grounding, electrical noise, and the enemies of the signal inside the panel
• Remote and distributed I/O, configuring hardware without software, how PLC hardware fails, and how to recover

Every chapter is built on real jobs from the plant floor and closes with field-tested methods and case files that turn troubleshooting from guesswork into a repeatable process.

About the author. Stan Turkel is an electrical engineer, educator, and Certified Power Quality Engineer with more than forty-five years in the field, from Fortune 500 plants and hospitals to water-treatment facilities and the ships of the U.S. Navy and Coast Guard.

Part of Stan Turkel's Troubleshooting Series, the field-first guides for the people who keep industry running.