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Programmable Logic Controllers
"Programmable Logic Controllers" provides the student with a general working knowledge of the various PLC brands and models. Programming concepts applicable to virtually all controllers are discussed, and practical programming problems are presented throughout the text. A basic understanding of AC/DC circuits, electronic devices (including thyristors), basic logic gates, flip-flops, Boolean algebra, and college algebra and trigonometry is a prerequisite. The PLC simulation CD that accompanies the text provides hands-on programming experience.
QST.
None
PLC Controls with Structured Text (ST)
This book gives an introduction to Structured Text (ST), used in Programmable Logic Control (PLC). The book can be used for all types of PLC brands including Siemens Structured Control Language (SCL) and Programmable Automation Controllers (PAC). Contents: - Background, advantage and challenge when ST programming - Syntax and fundamental ST programming - Widespread guide to reasonable naming of variables - CTU, TOF, TON, CASE, STRUCT, ENUM, ARRAY, STRING - Guide to split-up into program modules and functions - More than 90 PLC code examples in black/white - FIFO, RND, 3D ARRAY and digital filter - Examples: From LADDER to ST programming - Guide to solve programming exercises Many clarifying ...
Dereliction of Duty
"The war in Vietnam was not lost in the field, nor was it lost on the front pages of the New York Times or the college campuses. It was lost in Washington, D.C." —H. R. McMaster (from the Conclusion) Dereliction Of Duty is a stunning analysis of how and why the United States became involved in an all-out and disastrous war in Southeast Asia. Fully and convincingly researched, based on transcripts and personal accounts of crucial meetings, confrontations and decisions, it is the only book that fully re-creates what happened and why. McMaster pinpoints the policies and decisions that got the United States into the morass and reveals who made these decisions and the motives behind them, dispr...
In Defense of Housing
In every major city in the world there is a housing crisis. How did this happen and what can we do about it? Everyone needs and deserves housing. But today our homes are being transformed into commodities, making the inequalities of the city ever more acute. Profit has become more important than social need. The poor are forced to pay more for worse housing. Communities are faced with the violence of displacement and gentrification. And the benefits of decent housing are only available for those who can afford it. In Defense of Housing is the definitive statement on this crisis from leading urban planner Peter Marcuse and sociologist David Madden. They look at the causes and consequences of the housing problem and detail the need for progressive alternatives. The housing crisis cannot be solved by minor policy shifts, they argue. Rather, the housing crisis has deep political and economic roots—and therefore requires a radical response.
