Hi,

I would like to create a custom FB and have the input/output as structured variables per the APL standard - with the option of system attribute features - namely S7_archive.

I believe the APL implements User Defined Data Types (UDT) for a common real/bool structured variable, which include the value and status byte.

The question is, how can the value (real or bool) be archived individually?

From SCL code, I have the [attached] (with the UDT in the static area of the FB):

Note: The input T_BASE provides the option of archiving automatically in the FBs > Object Properties>I/Os, however user must select this manually.

With the goal of archiving myMV#Value {S7_archive:= 'longterm'}, how can this be initialised?

Solved:

Following forum link provides the correct initialisation of an archive variable for struct parameters as follows:

S7_xm_c := 'Value,true;' 

S7_xm_c attribute problem - 198513 - Industry Support Siemens