Foxboro PO930AA Fieldbus Module

Overview

The Foxboro PO930AA is an I/O interface and Fieldbus module. Designed for the Foxboro Distributed Control System (DCS) or I/A Series, its primary function is to interface field instruments and devices with Fieldbus networks. It facilitates seamless data exchange between the plant's field devices and the main control systems.

Specifications

Distributed Systems

The Intelligent Automation (I/A) Series system is an Open Industrial System (OIS) that integrates and automates manufacturing operations. It is an expandable distributed system that allows a plant to incrementally tailor the system to its processing requirements. The modules that make up the I/A Series system communicate with each other even though they can be located in a variety of locations. These locations depend upon the conditions and layout of the particular process plant. Another advantage of a distributed system is that each module has specific responsibilities. Each module independently performs its function regardless of the status of other modules

Field bus Modules

A Control Processor (CP) controls a process using its control database, which sends signals to and receives signals from the process (field devices) through a set of Fieldbus Modules (FBMs). But FBMs are NOT stations. Physically, they are smaller than stations and, logically, are on a separate communications path, called the Fieldbus.

Control Processor and Field Bus Module Connection

FBMs connect directly to process monitoring and controlling devices, such as pumps, valves, transmitters and thermocouples. They pass information about the process to the CP where it is made available to the control strategy and to other stations on the I/A Series network. The purpose of an FBM is to modify a signal, making it understandable to the hardware receiving it. For example, an analog signal coming in from the field (process) must be converted to a digitalized signal in order for the CP to understand it. Conversely, a digitalized signal going out to the field needs to be converted to an analog signal. An FBM falls into one of two major categories analog and discrete (digital; on – off), these are lights showing the on/off state of each channel (signal). An FBM communicates with one and only one station, the CP to which it has been assigned. An FBM is directly connected to the process (pumps, valves, etc.). It passes information about the process to the CP, where the information is made available to the other stations on the I/A Series network. The CP also passes information to the appropriate FBM, which forwards it to the process for control purposes.

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Selling

(DCS) Distributed Control System

ABB / Invensys Foxboro / Triconex / Westinghouse /

Woodward / HIMA / Yokogawa / Honeywell / Emerson

(PLC) Programmable Logic Controller

Rockwell Allen-Bradley / Schneider Modicon / GE

Fnauc / Siemens / Prosoft / Bachmann / Woodhead

(TSI) Turbine Supervisory Instrumentation

Bently Nevada / EPRO / ENTEK

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