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There are four basic steps in the operation of all plcs: input scan, program scan, output scan, and housekeeping. A plc is a solid- state, electronic device that controls the operation of a machine. • input scan – detects the state of all input devices that are connected to the plc • program scan– executes the user created program logic. The programmable logic controller ( plc) was invented in the 1960s to replace the sequential relay circuits traditionally used in machine control. Welcome to module 24, which covers programmable logic controllers, or plcs. Yet other modules or expansion modules are often dedicated to a specific application.
Siemens does not make any type of guarantee regarding its contents. The plc system programmable logic controller consists of the following components:. Output module: provides connection to the real- world output devices ot t dl h dl dc ac lt t t tdiitloutput modules can handle dc or ac voltages to output digital or analog signals identify the output module in your lab plc; how may output devices dittk? These steps continually take place in a repeating loop. Many modules have multiple functions that can interface with multiple sensor interfaces.
Automation solution totally integrated automation ( t i a) appendix i fundamentals of plc programming with simatic s7- 300 this document was provided by siemens a& d sce ( automation and drive technology, siemens a& d cooperates with education) for training purposes. It uses logic functions,. Module 1: introduction to plc hardware in this course module, the plc hardware is discussed. Identify the input module in your lab plc; how may inputs does it take? After studying this module, the student will know the major components of a plc and the functions of these components. Many plc manufacturers will organize these functions into individual modules; the exact content of each of these modules will likely be as diverse as are the applications.
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