Control and Information System Diagrams

To facilitate communication, it is necessary to establish formal rules for what is, and is not, represented on each type of Control and Information System Diagram. Based on our experience to date, we propose the following presentation rules:

The Control and Information Architecture Diagram should include the following:

• All major computing systems
• Connection lines to represent networks
• Weight or color of lines may be used to indicate relative bandwidth
• Depiction of the "Level" of each system and network (according to its 4Rs)
• Workstations are shown "generically" rather than by user group.
• Redundant systems are not drawn (but may be indicated)

The CIAD is developed during the Conceptual Engineering Phase, in parallel with the PFD (or MFD).

The Control and Information System Network Diagram should include the following:

• All major computing Servers
• Connection lines to represent networks
• Each network includes an indication of speed and protocol .
• All network specification changes (e.g. at routers) are indicated.
• Depiction of the "Level" of each system and network (according to its 4Rs)
• Workstations for all major user groups are indicated
• Redundant systems are shown
• Major Data Repositories are shown

The CIND is developed during the Preliminary Engineering Phase, in parallel with the PFD (or MFD).