Array Tag Addressing

Arrays can exist in the ControlLogix system PLC and/or the Plant SCADA tag database.

Within the ControlLogix system PLC, they are defined using the RSLogix 5000 Enterprise Series configuration software. See ControlLogix PLCs - Software Requirements.

Plant SCADA accesses the tag arrays within the ControlLogix system PLCs via the Address field of the Variable Tags for each tag or tag array. Equally, the way to define Plant SCADA tag arrays is also to use the Address field of the Plant SCADA Variable Tags for each tag array required in Plant SCADA.

Note: Plant SCADA tag arrays are simple, not complex, arrays. This means they can only contain elements of the same data type; for example, a digital tag array in Plant SCADA will only include digital type variables.

Tag arrays can be extremely flexible and quite complicated. It is possible to declare a tag array in Plant SCADA which maps to a tag array in a ControlLogix system PLC, or which maps to a contiguous sequence of tags (of the same data type) which may or may not be defined as a tag array in the ControlLogix system PLC.

See Also

Mapping to Individual Elements of an Array

Individual Tag Address Type Mapping

Mapping to More Than an Individual Element of an Array

Mapping Data Types for Array Tag Addressing