Rockwell Automation Logix5000 Controllers I/O and Tag Data Programming Manual - Manual (Page 24)

Chapter 2 Organize tags
The minimum memory allocation for a tag is four bytes. When you create a tag
that stores data that requires less than four bytes, the controller allocates four
bytes, but the data only fills the part it needs.
Data Type Bits
31 16 15 8 7
1
0
BOOL Not used 0 or 1
SINT Not used -128…+127
INT Not used -32,768…+32,767
DINT -2,147,483,648…+2,147,483,647
REAL -3.40282347E 38 …-1.17549435E -38 (negative values)
0
-1.17549435E -38 -…3.40282347E 38 (positive values)
The COUNTER and TIMER data types are examples of commonly used
structures.
Item Description
To expand a structure and display its members, click the + sign.
To collapse a structure and hide its members, click the – sign.
Members of running_seconds.
COUNTER Structure.
TIMER Structure.
Data Type Members.
To copy data to a structure, use the COP instruction.
Refer to the Logix5000 Controllers General Instructions Reference Manual ,
publication 1756-RM003 .
24 Rockwell Automation Publication 1756-PM004E-EN-P - October 2014