Structured Text PLC Programming Example for Input & Output Tag Aliasing Assignments

Structured Text PLC Programming Example for Input & Output Tag Aliasing Assignments

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One of the ways we utilize Structured Text to speed up machine development is through input and output assignment. In a typical system integration environment, one would have to create a rung dedicated for every input and output in order to pass the data to an internal tag of the PLC. The reason for this practice was discussed in a tutorial on tag aliasing we've released before. In short, by doing so, we can easily reassign and expand our tags as the program changes.
As you design a new piece of equipment or system, it's important to keep documentation of every point of input and output. More often than not, this documentation would be kept in an Excel spreadsheet and used by electricians during the installation phase and by engineers during the commissioning phase. In other words, it's a list of all the inputs and outputs of the system identifying their location and what they're connected to in the field.
By using Structured Text over ladder logic in this specific case, programmers can create simple string manipulations in Excel and implement the entire tag architecture through copy pasting entire routines. Furthermore, by taking this approach, it becomes much easier to make changes to an existing system and to export the information of data into other structures or databases.

Full Tutorial:
www.solisplc.com/tutorials/structured-text-example-for-input-output-tag-aliasing-assignments

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