Applies To:
  • CitectSCADA
  • CitectHMI
Summary:
In the Allen Bradley ControlLogix PLC the variable tags 'scope' can be either 'Controller tags' which are global or 'Program Tags' which are local to the program section in which they are defined. In this way tags in separate program sections can have the same name. How can these be accessed via the Citect ABLOGIX driver. 

Solution:
The addressing for Controller tags is just the tag name but for Program tags the syntax of the address should be

program:<ProgramName>.<Tagname>

e.g. if the PLC has a (sub)program called "Motor1" which has a program tag defined which is called "Start" then the address for this tag is

program:Motor1.Start

 
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