user defined data type in rslogix 5000

[md.abdullah]

hello every one
as i am new to this forum
i want to know detial of udt in rslogix 5000
does all tags in udt get in my program?
if i have to write program still then what is benefits of udt
simply we can make tags differentially.
i am making instrument calibration interpolar by udt
give me some idea about it

 

[rdrast]

UDT's are a convenient way to combine all the storage required for some function in a single place, and promote easier reuse of code.

They are just data structures, why would you think that they would obviate the need to write a program using the data?

 

[md.abdullah]

thanks for the quick response rd
can i make calculation tag in udt
if yes then how
please provide me some useful link for the detail
thanks agian

 

[sthompson]

Rockwell/AB recommends you start with this Manual for UDTs.


http://literature.rockwellautomation.com/idc/groups/literature/documents/qs/1756-qs001_-en-p.pdf

Stu....

 

[md.abdullah]

thanks athomson

 

[bernie_carlton]

After reading the Allen Bradley material you may come to realize that a UDT is not a tag, it is the template for a (possibly) complex tag. Just as INT and DINT and STRING are not of themselves tags but are the definition of the structure of a tag, your UDT is the description of a structure. After making your UDT, when creating your tags you can select your UDT from the list of types just as you can select DINT or REAL.

In a like concept, and AOI is a definition of a logic structure with its acceptable types of variables. You create it then, at the appropriate point in the program you create an 'Instance' of it (much like creating a tag using the UDT as the template).

 

[md.abdullah]

thank you lot to all