If a Procedure type is set to Sub device output, a call will be made on the OSDI to initialise the POD when the procedure is activated.
To select a POD:
Call up the Program editing functions menu and select the Program flow diagram
Start a new procedure or edit an existing one. Choose Body editing
Select Procedure overview
Set the Procedure type to Sub device output
Select the POD to which you want to send input. Pressing Ctrl+P will generate a list of the PODs available for the active Device Group. Here is the overview for an example procedure that selects the journal printer:
As you can see, PODs are referred to by the names you gave them in DFSETUP. When this procedure is activated during program execution both the COD mnemonic ('P' in this case) and the parameter string (`J' 0x0a for our 12-point text journal) that together define this POD are passed to the OSDI.