The PERA Model defines the Productiuon Facility Architecture as one of three basic components of any enterprise (the other 2 are the People/Organization, and the Control and Information Systems ).
The Production Facilities of the enterprise may be represented by a series of "Architecture" diagrams, beginning with the Process Flow Diagrams, Material Flow Diagrams, and Physical Architecture Drawings. PERA does not define any additional diagrams or documents for the Production Facilities, since an adequate set of these has already been evolved for most industries. However, PERA does place these documents within an Architecture which relates them to the appropriate enterprise development phase, and to the other components of the enterprise.
The Architecture of continuous processing facilities (like oil refineries) are described with "Process Flow Diagrams", while descrete manufacturing (like a parts assembly plant) is described wtih Material Flow diagrams.
Similar Mechanical Arrangement Diagrams (MFDs) used in descrete manufacturing. In much the same way that the PFD or MFD shows major material flows and major processing equipment and storage facilities, the CIAD shows major information flows, information processing, and storage systems
A P&ID (Piping and Instrumentation Diagram (EAD) is a schematic representation of the , piping, instrumentation, process equipment, and intermediate storage (tanks), and how these are connected. The P&ID also shows how instrumentation and control devices (like automated valves) are connected in "control loops" to effect regulatory contol of the process units. Note that higher level optimization functions are not usually represented on P&*IDs.