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These materials were developed for a seven-unit secondary or postsecondary education course on programmable logic controllers (PLCs) that treats most of the skills needed to work effectively with PLCs as programming skills. The seven units of the course cover the following topics: fundamentals of programmable logic controllers; contracts, timers, and counters; sequencers and registers; editing and programming functions; installation and troubleshooting; types of PLCs and programming; and industrial program applications. The first section of the manual is designed to show teachers how to use the materials and includes an explanation of instructional elements; an instructional task analysis for each unit; a list of tools, equipment, and materials; and a list of 14 references. Each instructional unit includes some or all of these basic components: performance objectives; suggested activities; information sheets; transparency masters; assignment sheets; job sheets; tests; and test answers. Some elements, such as the information sheets, include photographs, diagrams, and line drawings. (CML)

1Boy Crusoe

By Allan Eric

Also published as" A Yankee Crusoe" . A 15 year old hard working and studious farm boy finds the lure of adventure on the seas as a merchant seaman more than he can resist. This is his story. " I was born in a little town in the State of Maine, near the close of the Civil War. My boyhood life did not differ materially from that of the average farmer's son in the remote country districts of New England--except, perhaps, that I read more and thought more. Hard work on the rugged soil, two terms each year in the little yellow country schoolhouse, a day's fishing now and then filled the early years of my life full to over-flowing. " What he gets is enough excitement and adventure to overflow his wildest dreams. How he experiences disaster and uses his wits and knowledge to overcome every problem makes for a great read. - Summary by Phil Chenevert