Rockwell Automation 1757-SWKIT4000 ProcessLogix R400.0 Installation and Upgrade Guide - Manual (Page 264)

Publication 1757-IN040B-EN-P - March 2002
11-12 Performance and Capacity Specifications
Communications Capacity
and Performance System Communications Load Philosophy and Guidelines
The ProcessLogix System is designed with certain patterns of
communications in mind. Being aware of the intended traffic flows
will help the application engineers to insure that the application
realizes the highest usage from the system’s architectural capabilities.
The basic concept is shown in the following hierarchical diagram. It
shows four levels of networking: Plant Information, Supervisory, I/O,
and Device. It also includes four levels of networking nodes:
Application stations (like operator stations and high-level application
nodes), controller-level stations, I/O level chassis, and directly
networked devices.
Device
Node Device
Node Device
Node Device
Node Device
Nodes
Device
Node Device
Node Device
Node Device
Node Device
Nodes
Device
Node Device
Node Device
Node Device
Node Device
Nodes
Oper/App Node Oper/App Node Oper/App Node
Server Node
Controller Node
Controller Node Controller Node
IONode IONode IONode IONode
Device Networks (e,g, Fieldbus H1)
Supervisory Network (ControlNet)
Plant Information Network (Ethernet)
IO Networks (ControlNet)
Device
Node Device
Node Device
Node Device
Node Device
Nodes
IONode IONode