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Instant PLC Programming with RSLogix 5000 by Austin Scott

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Understanding online changes (Intermediate)

In this recipe, we will introduce the concept of Online Changes in RSLogix 5000. We are going to make an online modification to our VALVES routine by adding logic to check for a power-failure event.

Getting ready

In order to complete this recipe, you will need to have a PLC project that is free from errors, has been downloaded to the PLC, and is Online and Equal.

How to do it...

  1. When you are online on your PLC (if you are not sure how to do this read the recipes Uploading explained (Simple) and Downloading explained (Simple)), right-click on Program Tags, and select New Tag… (or press Ctrl + W).
  2. On the New Tag form that appears, create a new base type tag using the following values:
    • Name: POWER_FAILURE
    • Description ...

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