Rockwell Automation 1757-SWKIT5100 ProcessLogix R510.0 Installation and Upgrade Guide - Manual (Page 252)

Publication 1757-IN510A-EN-P - October 2003
11-12 Performance and Capacity Specifications
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 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.
Figure 11.1 System Communications Architecture
The server is the head of a “pyramid” of controllers. Each controller, in
turn, is a head of a pyramid of IO chassis. Each IO chassis is in turn, a
head of a pyramid of field devices nodes.
External
DCS
Systems
ABRIO
Operator and
Applications Nodes
Server Node
Controller
Nodes
IO Nodes
Device Nodes