Since the first edition of this book in 1988, the capabilities of programmable
logic controllers have grown by leaps and bounds. Likewise, the applications
of PLCs have grown with them. In fact, in today’s increasingly computercontrolled
environment, it is almost impossible to find a technical industry
that does not use programmable controllers in one form or another. To
respond to these phenomenal changes, we introduce the second edition of
Programmable Controllers: Theory and Implementation