Allen-Bradley LOGIX 5000 Reference Manual page 547

Common Attributes for Advanced Process Control and Drives Instructions
Do not convert data to or from the BOOL data type.
Important: The math status flags are set based on the value being stored. Instructions that normally do not affect
math status keywords might appear to do so if type conversion occurs because of mixed data types for
the instruction parameters. The type conversion process sets the math status keywords.
Safety Data Types
The Logix Designer application prevents the modification of a User Defined or
Add-On Defined type that would cause an invalid data type for User Defined or
Add-On Defined types that are referenced directly or indirectly by a Safety tag.
(This includes nested structures.)
Safety tags can be composed of the following data types:
•
All elementary data types
•
Predefined types that are used for safety application instructions.
•
User-defined data types or arrays that are composed of the previous two
types.
Online edits of UDT member names in safety tags
Online editing is allowed for member names of user-defined data types on
CompactLogix 5380, Compact GuardLogix 5380, CompactLogix 5480,
ControlLogix 5580, and GuardLogix 5580 controllers. However, online editing is
disabled when a user-defined data type is used on a safety tag and the controller is
in the Safety Secured state.
See also
Math Status Flags
Rockwell Automation Publication 1756-RM006K-EN-P - November 2018
1.6 2
-1.6 -2
1.5 2
-1.5 -2
1.4 1
-1.4 -1
2.5 2
-2.5 -2
on page 537
Chapter 11
547