Architectural Overview of a Foxboro Evo Process Automation System

The Foxboro Evo Process Automation System (PAS) is comprised of a suite of Control Stations and other devices interconnected through a FECN (formerly MESH) network. Control Stations can include WSTA70/WSVR70 that hosts CPs, Historical Database servers and collectors, or, in the case of Foxboro Evo, a Galaxy repository. Operator Stations are used to control plant processes predefined in control system strategies, compounds, and blocks that reside on CPs.

CPs connect to the FECN network and to one or more Fieldbus Modules (FBMs) to perform logic, sequential control, data acquisition, alarm detection, and alarm notification. CPs execute control algorithms composed of control blocks. These control blocks are organized into a container called a compound. Multiple compounds can reside simultaneously on a single CP. If using Foxboro Evo, related compounds are grouped to form a strategy.

An FBM is a simple processor that connects a number of process sensors or actuators to a CP. The FBM allows CPs to communicate with remote FBMs for further geographical distribution of functions in the field.

For SCP, both the CPs and the FBMs are removed from the offline system and replaced with one or more SCP computers. SCP emulates the FBM logic.