Foxboro P0923NB-OC/P0923NAC Communication Interface Module

Overview

The P0923NB‑OC and P0923NAC are high-speed communication interface modules (Fieldbus Modules / Node Bus Controllers) for the Foxboro I/A Series DCS. They provide deterministic, real-time communication between field devices, control processors, and FBMs. Built for fault-tolerant operation with galvanic isolation, these modules maintain reliable performance in industrial environments including power generation, petrochemical plants, and feedwater/turbine control systems.

Technical Specifications

General Information

Functional Capabilities

• High-speed, deterministic communication between field devices and controllers

• Redundant node configuration for fault-tolerant operation

• Real-time data exchange for monitoring and process control

• High noise immunity for harsh industrial environments

• Integrated diagnostics and LED indicators (Power, Run, Fault, Network)

Communication Specifications

• Protocol: Proprietary Foxboro I/A Series stack

• Data Transmission: Deterministic, high-speed control loop communication

• Isolation Voltage: 1500 VAC galvanic isolation

• Supported Topology: Node bus / Fieldbus network controller

Electrical Specifications

• Power Supply: 24 VDC nominal (±10%)

• Redundant Power Input: Supported

• Power Consumption: Consistent with similar Foxboro communication modules

Environmental Ratings

• Operating Temperature: –20°C to +70°C

• Storage Temperature: –40°C to +85°C

• Humidity: 5%–95% RH, non-condensing

Physical & Installation

• Weight: 0.5 kg

• Mounting: DIN rail or backplane carrier

• Certifications: UL, CE, CSA industrial safety standards

Key Features

• Deterministic, high-speed communication for Foxboro I/A DCS

• Galvanic isolation for signal protection and safety

• Supports redundant configuration for fault-tolerant networks

• Compact, industrial-grade design for harsh environments

• Integrated diagnostic functions and LED indicators

• Ideal for turbine control, feedwater systems, and mission-critical processes

Applications

Designed for critical industrial systems where reliable, real-time communication is required, including power plants, chemical and petrochemical processes, and advanced turbine or feedwater control.

FAQ

Q: Can these modules be used in redundant network configurations?
A: Yes, both P0923NB‑OC and P0923NAC support redundant node configurations for fault-tolerant operation.

Q: What industrial environments are these modules rated for?
A: They operate in temperatures from –20°C to +70°C with high noise immunity and non-condensing humidity tolerance.