
Publication LOGIX-AP008B-EN-P - June 2008 127
Conversion of Typical Program Structures Chapter 4
Call-up
Both the call-up code and the instances of UDT Valve are located in the
program “valves_callup”, which runs under task_02s. The frequency with
which the call-up code is executed depends on the application and the size of
the valve.
The screen shot below shows the data instances.
Add an instance of type Valve for each physical valve. The first tag is the
required “backing tag” for the Add-On Instruction.
The screen shot below shows the call-up code.
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