14 Rockwell Automation Publication 1756-PM020F-EN-P - January 2019
• Define data in one, two, or three dimensions, as required (one
dimension is the most common).
• Use atomic or structure data types.
Data in the controller is organized as tags. The tags come in two basic types:
atomic and structure. Atomic types can be arrayed or singular, and are very
easy to work with. Structure types provide a great deal of flexibility, but are
more challenging to access. See the Atomic data type sizes table for details.
See also
CIP services overview on page 13
Atomic data type sizes on page 14
Logix 5000 data on page 14
Use the atomic data type sizes table for the data type value to use to store a
bit.
To store a Use this data type
Bit BOOL
Bit array DWORD (32-bit boolean array)
8-bit integer SINT
16-bit integer INT
32-bit integer DINT
32-bit float REAL
64-bit integer LINT
The Logix 5000 controller stores data in tags, in contrast to a PLC-5 or SLC
controller, which stores data in data files. Logix 5000 tags have these
properties:
• Name that identifies the data:
• Up to 40 characters in length.
• Scope:
• Controller (global), accessed directly.
• Program (local), which cannot be directly accessed, but can be
copied to a controller scope tag.
• Data type, which defines the organization of the data.
See CIP data types for more information.
In the Logix Designer application, version 21.00.00 and later, and in
RSLogix 5000 software, version 18.00.00 and later, external access to
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