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A programmable logic controller (PLC) or programmable controller is an industrial computer that has been ruggedized and adapted for the control of manufacturing processes, such as assembly lines, machines, robotic devices, or any activity that requires high reliability, ease of programming, and process fault diagnosis.
IEC 61131-3 is the third part (of 10) of the international standard IEC 61131 for programmable logic controllers.It was first published in December 1993 [1] by the IEC; the current (third) edition was published in February 2013.
Introduccion a la programacion de controladores logicos (PLC) Image title: Automatizacion industrial: Author: Rolf Dahl-Skog: Software used: Writer: Conversion program: OpenOffice.org 3.0: Encrypted: yes (print:yes copy:no change:no addNotes:no algorithm:RC4) Version of PDF format: 1.4: Page size: 612 x 792 pts (letter)
With the CODESYS Application Composer, which partly can be used free of charge, users can have complete automation applications generated as part of the IEC 61131-3 tool. To do this, they can configure their machine or system on the basis of modules that define, for example, the mechatronic structure or the software function to be used ...
Sequential function chart (SFC) is a visual programming language used for programmable logic controllers (PLCs). It is one of the five languages defined by IEC 61131-3 standard. The SFC standard is defined as Preparation of function charts for control systems , and was based on GRAFCET [ fr ] (itself based on binary Petri nets [ 1 ] [ 2 ] ).
Unlike for microprocessors, programming a PLD changes the connections made between the gates in the device. PLDs can broadly be categorised into, in increasing order of complexity, simple programmable logic devices (SPLDs) , comprising programmable array logic , programmable logic array and generic array logic ; complex programmable logic ...
The IEC 61131-3 is a standard defining the programming languages for PLCs, embedded controls, and industrial PCs, harmonizing applications independent from specific dialects, but still based on known methods such as the textual programming languages Instruction List, and Structured Text, the graphical programming languages Function Block ...
A feedback control loop is directly controlled by the RTU or PLC, but the SCADA software monitors the overall performance of the loop. For example, a PLC may control the flow of cooling water through part of an industrial process to a set point level, but the SCADA system software will allow operators to change the set points for the flow.