PERA Control and Information Architecture


PERA Concept Diagram - 3027 Bytes

PERA defines the Control and Information Architecture as one of three basic components of any enterprise (the other 2 are the Production Facilites, and the People/Organization). In the PERA Framework, it is usually depicted on the right, although it has an interface with the "Facilities".of the enterprise, so the diagram might actually be better represented if it were "wrapped around" into a sphere.

The Control and Information Architecture may be represented by a series of "Architecture" diagrams.

Unlike the Facility Architecture, and the Organizational Architecture, it has been necessary to develop a number of new diagrams to represent the Control and Information systems and networks. These begin with the Control and Information Architecture Diagram (CIAD), and progress through increasing levels of detail as the enterprise develops
Since no adequate tools for this purpose were previously available, we have proposed a Control and Information Architecture Diagram (CIAD) which serves the same purpose as the PFD or MFD for the Production Facility component of the enterprise and is also developed during the Conceptual Engineering Phase of the Enterprise. PHYS_ARC_small.gif - 5615 Bytes

As the Enterprise design proceeds, the information on the CAID is develped into a Control and Information Network Diagram (CIND). This parallels the development of the P&ID from the PFD, or the M&ID from the MFD. This CIND document is at a "higher level" than the P&ID in the Control and Information Architecture, and thus "completes" the low level Control and Information System structure presented on the P&ID. The CIND is also developed during the "Preliminary Engineering" phase at the same time that the P&ID is being developed..

The rules for content and presentation of information on the CIAD and CIND are explained in more detail under "What is a Control and Information Architecture".

At the CIAD level, it is not necessary to distinguish between the physical (servers, communications networks, etc.) and the Logical (software, dataflows, databases, etc.).

At the next level, the Control and Information Network Diagram (CIND) the distinction between physical and logical components of the Control and Information Architecture is made for the first time.

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The CIND is typically developed during the Preliminary Engineering Phase, at the same time as the P&ID or M&ID. A key concept in the CIND is the use of Architectural "Levels" related to the 4R's of system and network design.

From the Preliminary Engineering Phase onward (when the CIND is developed), a clear distinction is made between diagrams relating to either the physical or logical component of the Control and Information Systems.

PHYSICAL Network Diagrams (primarily representing physical network structures) and ultimately to wiring diagrams, etc. LOGICAL Entitiy Relationship Diagrams (primarily representing dabase structures), program dataflows,

The Control and Information Architecture Diagram (CIAD) is a schematic representation of the information processing nodes (computer systems) and communications (networks) which comprise the Control and Information Systems of the Enterprise. CIADs are high level drawings similar to the "Process Flow Diagrams" (PFDs) used in process industries, or Mechanical Flow 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

Like the PFD, the CIAD should be developed during the Conceptual Engineering Phase at roughly the same time as the PFD or MFD. Depeding on the complexity and the state of definition of the enterprise, the CIAD may be presented at various levels of detail ranging from very "high level" (e.g. a half page representation of a whole enterprise) to a much more detailed version showing each server farm and block of users. Click here for a more detailed description of CIADs and the rules for drawing them.

Control and Information Network Diagram (CIND) is a schematic representation of the information processing nodes (computer systems) and communications (networks) which comprise the Control and Information Systems of the Enterprise. CINDs are more detailed drawings. In much the same way that the "Piping and Instrumentation Diagrams" (PFDs) used in process industries, or manufacturing industries show major material flows and major processing equipment and storage facilities, the CIND shows major information flows, information processing, and storage systems. Click here for a more detailed description of CINDs and the rules for drawing them. The CIND is developed during the Preliminary Engineering Phase in parallel with the P&IDs.

  • Sequence Control Flow Charts are developed to convey the continuous (regularory loops), descrete control logic (interlocks), and sequence control logic (sequence of operations, both manual and automatic). These are developed during Preliminary Engineering Phase in parallel with the P&IDs and CINDs. There are a large number of diagram produced during the Detail Engineering Phase to develop the next level of detail from the CIND. These include:

    For more discussion of the concept of Control and Information Architectures see "What is an Information Architecture" the Frequently Asked Questions section.


  • by Gary Rathwell reserved

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