From the course: PLC Memory Organization
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Tags types for ControlLogix controllers - Ladder Logic Tutorial
From the course: PLC Memory Organization
Tags types for ControlLogix controllers
- ControlLogix controllers use 32 bits double where it's memory structure. So the minimum memory allocation for a tag is four bytes or 32 bits of data. Now, when you create a tag to store data that require less than four bytes, the controller creates four bytes tag but the data only fills the parts it needs. The types of data that a tag can be are Boolean, Single Integer, Integer, Double Integer, and a Real Number. Here's an overview of each data type and how many bits each data type uses. This window shows how the tags look like inside the software. A column for tag name and for data type. For example, north tank mix is a Boolean type tag. You can also see here, couple of different data types. Like, counter, timer and tank. They are part of structure tags. Structure type tags are used for grouping different data types that function as a single unit and serve a specific purpose. The first type is called predefined…
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