Rockwell Automation DeviceLogix System User Manual - Manual (Page 144)

144 Publication RA-UM003B-EN-P - February 2010
Chapter 7 Create Logic in the New Ladder Editor
Working with the Tag Database
Devices have two kinds of tags:
• product scope tag
• program scope tag
If you edit Macro logic, then the product scope tag will be replaced
with the Macro scope tag.
Product scope tags are the product I/O defined in DeviceLogix. You
can assign alias names to product scope tags. In the logic
configuration, only alias tag names are used. Alias tag names are not
case-sensitive.
Use Bit type tags for input contact or output coil binding, depending
on the tag type. Use Analog input type tags only in instruction input
binding. You can use Analog type output tags in instruction output
binding, as long as the data type matches.
Use the program scope tag when you want an instruction to reference
the results of other instructions. It is a "soft" tag and is created
dynamically during the logic editing.
Product Scope Tags
I/O Data Group I/O Data Data Type Reference Rule
Hardware Input Device Input (DIP) Bit Input
Analog Input (AIP) DINT/REAL Input
Hardware Output Device Output (DOP) Bit Output/Input
Analog Output (AOP) DINT/REAL Output/Input
Soft Input Fault Bit (FB) Bit Input
Consumed Network Data (CNB) Bit/DINT/REAL Input
Status Bit (SB) Bit Input
Soft Output Produced Network Data (PND) Bit/DINT/REAL Output/Input