Programmable Logic Controller Handbooks - Volume 1

Programmable Logic Controllers (PLCs), are used in a variety of commercial and industrial applications. A PLC monitors inputs, makes decisions based on its program, and regulates outputs to automate a process or machine. This book is designed to provide information on successfully integrating a PLC into actual day-to-day processes. It not only deals with the PLC hardware and software, but all the surrounding systems that must be compatible to achieve a safe and reliable PLC control system. Articles by leading experts will discuss important installation, operation, and troubleshooting information, that electrical personnel need to know in order to design and maintain a safe and reliable programmable logic control systems.

CONTENT:

What is a PLC?
Advances in Microprocessor-based Distribution Relays
Compromises of Using a 10-Gbps Transceiver at Other Data Rates
Programmable Logic Controllers: Ladder Logic
Ethernet/IP: Industrial Protocol
SCADA: Choosing a Polling Mode for DF1 Half-Duplex Master
Industrial Ethernet: An Engineer's Guide
PACs for Industrial Control, the Future of Control
PLC Developments: The Near Future
Programmable Logic Controllers
Tuning a PID Controller for a Digital Excitation Control System
Using PLDs for High-Performance DSP Applications
Web-Enabling your PLC
Input Signal Edge Rate Guidance
Removable Storage Media Add Flexibility to Modern day PLCS
Assessment and Remediation of Vulnerabilities in the SCADA and Process
Control Systems of Utilities
Basics of PLCs
Field Programmable Controllers for Cost Sensitive Applications
PLCs Pack It In
Logic Control for Robot Work Cells
State Language for Machine Control
Buyer's Guide
-- 100+ Pages

General Definition:
The main difference from other computers are the special input/output arrangements. These connect the PLC to sensors and actuators. PLCs read limit switches, temperature indicators and the positions of complex positioning systems. Some even use machine vision. On the actuator side, PLCs drive any kind of electric motor, pneumatic or hydraulic cylinders or diaphragms, magnetic relays or solenoids. The input/output arrangements may be built into a simple PLC, or the PLC may have external I/O modules attached to a proprietary computer network that plugs into the PLC. PLCs were invented as less expensive replacements for older automated systems that would use hundreds or thousands of relays and cam timers. Often, a single PLC can be programmed to replace thousands of relays. Programmable Logic controllers were initially adopted by the automotive manufacturing industry, where software revision replaced the re-wiring of hard-wired control panels. The earliest PLCs expressed all decision making logic in simple ladder logic inspired from the electrical connection diagrams. The electricians were quite able to trace out circuit problems with schematic diagrams using ladder logic. This was chosen mainly to reduce the apprehension of the existing technicians. The functionality of the PLC has evolved over the years to include typical relay control, sophisticated motion control, process control, distributed control systems and complex networking. Today, the line between a general purpose programmable computer and a PLC is thinning. The data handling, storage, processing power and communication capabilities of some modern PLCs are approximately equivalent to desk-top computers. PLC-like functionality, combined with remote I/O hardware, allow a general-purpose desktop computer to overlap some PLCs in certain applications. - Wikipedia

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