Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 78)

Chapter 4 Data access control
2. In the New Tag dialog box, in the Type list, choose a tag type.
3. Select the Constant check box.
4. Click Create.
See Constant check box availability on page 80 for considerations.
Configure a constant in the Tag Properties dialog box
Follow these steps to designate a tag as a constant on the Tag Properties
dialog box.
1. On the Tag Editor, right-click a tag and then click Edit (tag name)
Properties.
78 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014