Allen-Bradley controllogix 1756-L61, Application Book

Page: 14 / 56

Publication LOGIX-AP007B-EN-P - January 2007
14 CompactFlash Commands
CF_Data_Working Tag
Before explaining the four commands, you need to understand the layout of a
key tag in the application. The CF_Data_Working tag, a user-defined data type
tag (UDT), is at the program scope.
This is an example of a user-defined data type tag or UDT.
When a command is executed, the routines use this tag to get all the
information needed to perform the command, such as file name, data, or
number of bytes to read or write. The table below is a layout of the UDT in the
file structure area.