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- W1036784341 abstract "This chapter provides an introduction to internal relays, which are often known as auxiliary relays, markers, flags, coils, and bit storage. These elements give special built-in functions to a programmable logic controller (PLC) and are very widely used in programming. A small PLC might have a hundred or more internal relays, some of them being 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 a power failure. While using an internal relay, it has to be activated on one rung of a program, and then its output is used to operate switching contacts on another rung, or rungs, of the program. Internal relays can be programmed with as many sets of associated contacts as desired. To distinguish internal relay outputs from external relay outputs, they are given different types of addresses. With ladder programs, an internal relay output is represented by using the symbol for an output device with an address, which indicates that it is an internal relay rather than an external relay. Another use of internal relays is for resetting a latch circuit." @default.
- W1036784341 created "2016-06-24" @default.
- W1036784341 creator A5016788713 @default.
- W1036784341 date "2006-01-01" @default.
- W1036784341 modified "2023-09-24" @default.
- W1036784341 title "Internal relays" @default.
- W1036784341 doi "https://doi.org/10.1016/b978-075068112-4/50025-5" @default.
- W1036784341 hasPublicationYear "2006" @default.
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