PLC Data Types & Structures - Allen Bradley PLC RSLogix 5000 Basics Programming BOOL INT DINT Arrays

PLC Data Types & Structures - Allen Bradley PLC RSLogix 5000 Basics Programming BOOL INT DINT Arrays

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The most fundamental programming block is a boolean which stores the value equal to 0 or 1. A boolean is used for most basic instructions and to evaluate most logic within PLC programming.
At the point of creating a tag through laying out logic or by using the tag creator, the user may specify the data type for the tag. Through the tag creation tab, the data type is specified within the "Data Type" tab. Note that once the tag is created online, it's impossible to change the type. The workaround to make that happen would require the user to delete the tag and re-create it again.
By typing in the tag "Data Type", a window is opened from which the user may choose the type of tag one wants to create. Note that the types listed here will include the default Allen Bradley as well as custom UDTs.
As a beginner, you'll be creating a lot of Boolean tags while programming. Most basic instructions such as the XIC, XIO and OTE utilize BOOLs. It's important to keep in mind that creating a large number of BOOLs can be done through different means. The first way is to use individual booleans from within DINTs as we'll see in the next section. The second way is to create arrays of BOOLs as we will see in the last section.

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