State-of-the-Art PLC Configuration
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IEC 61131-3 takes advantage of recent advances in technology by incorporating modern concepts that allow the modelling of PLC projects consisting of more than just single-processor applications.
The software model of IEC 61131-3 allows for practice-oriented structuring (modularization) of applications into units (POUs). This eases maintenance and documentation, and improves the diagnostics facilities for PLC programs.
A uniform software architecture is essential for the portability of applications. The resources of PLCs are given explicit run-time properties, thus building a platform for hardware-independent programs.
In the traditional method of structuring PLC projects (see Figure 2.5), applications are modularised into blocks, and certain types of blocks (e.g. organization blocks) have implicit run-time properties. IEC 61131-3 provides more sophisticated and standardised means of accomplishing this.
KeywordsGlobal Variable Function Block Access Path Task Property Configuration Element
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