![]() ![]() A small PLC might have a hundred or more internal relays, some of them battery backed so that they can be used in situations where it is necessary to ensure safe shutdown of a plant in the event of power failure. These are one of the elements included among the special built-in functions with PLCs and are very widely used in programming. A variety of other terms are often used to describe these elements, such as auxiliary relays, markers, flags, coils, and bit storage. This chapter discusses programming and introduces internal relays. Bolton, in Programmable Logic Controllers (Fifth Edition), 2009 Publisher Summary ![]()
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