From the course: PLC Memory Organization
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Base and Alias tags - Ladder Logic Tutorial
From the course: PLC Memory Organization
Base and Alias tags
- [Instructor] Tags are also classified into four types: base tags, alias tags, produced and consumed tags. Now let's look at the concept of base tags. Whenever a device is added into one of the I/O modules, RSLogix 5000 automatically assigns a tag or an address to it. The tag defines a memory location where data are stored. You can see here examples of I/O tag addresses; Local:1 Input Data.1, Local:2 Output Data.4. These tags that are created are called base tags. A base tag is a tag that represents the location where the data is stored in memory. By default, all tags created are base tags. The tags that are associated with I/O modules or internal tags that are created by the user during programming. Now, when we give a name for that base tag, this is called an alias tag. An alias tag is simply another name for an already named memory location. You can see here in this window three columns showing the name of the tag…
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