In the Fides guide (Page 53), the Π Placement factor is defined by the items below:
Non-interface digital function
Interface digital function
Non-interface low level analog function
Interface low level analog function
Non-interface power analog function
Interface power analog function
The criterias of selection between the items are not very clear to me.
What is the difference between the low level analog function and the power analog function ? Is there a power threshold between the two items (10 W, 100W, 1000W) ?
What is the boundary between the interface and the non-interface ? Shall we consider the interface between the equipment functions ? Shall we consider the interface between the equipment and external systems only ? Are interface fonctions limited to protection items (transil, tranzorb...), fitering items (filters, coil, capacitors???), isolation means (optocouplers, transformers...), connectors...