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- W970180047 abstract "This chapter describes the ladder logic diagrams and programmable logic controller (PLC) implementations. A common component of a hardwired control implementation is a control relay. When no current is applied to the coil, the coil is not energized, due to which the normally open contacts remain open and the normally closed contacts remain closed. A PLC can be programmed using a software ladder logic diagram that is very similar to an electrical ladder logic diagram. In a software ladder logic diagram, input conditions, such as the status of on/off switches, contacts of coils, push button switches, and limit switches are denoted by the contact symbols. Any p-input m-output N-state-variable discrete logic controller given by Boolean logic equations can be specified in terms of a software ladder logic diagram. The output of the central processing unit (CPU) then goes through another input/output (I/O) interface that converts the CPU output into command signals that are sent to the output devices. The status of the inputs and outputs are stored in the I/O interfaces using registers that have numerical addresses for reference purposes. There are also registers in the CPU that store the status of the software coils comprising the PLC control program." @default.
- W970180047 created "2016-06-24" @default.
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- W970180047 date "1999-01-01" @default.
- W970180047 modified "2023-10-16" @default.
- W970180047 title "Ladder logic diagrams and PLC implementations" @default.
- W970180047 doi "https://doi.org/10.1016/b978-012394850-2/50008-4" @default.
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