Foxboro RH923YUOB Rail-Mounted PLC Control Module

Overview

The RH923YUOB is a modular, rail-mounted PLC/control module engineered for the Foxboro Evo™ and I/A Series Distributed Control System (DCS). It provides a robust interface for Fieldbus Modules (FBMs), enabling high-speed, deterministic communication between field instruments and control processors.

Designed for industrial-grade reliability, this module supports fault-tolerant configurations, redundant 24 VDC power, and advanced diagnostics. It ensures continuous operation in mission-critical automation systems across chemical plants, refineries, power generation, pharmaceuticals, and aerospace applications.

Technical Specifications

General Information

Functional Capabilities

• Provides secure electrical and communication interface for up to 8 FBMs

• Executes logic, timing, and regulatory control functions

• Supports dual-module fault-tolerant operation

• Real-time diagnostics and system health monitoring

• Suitable for continuous operation in harsh environments

Processor & Memory

I/O Characteristics

• Digital Inputs: 16

• Analog Inputs: 8

• Digital Outputs: 16

• Analog Outputs: 8

• Input Voltage: 24 VDC

• Supports Ladder Diagram (LD), Function Block Diagram (FBD), Structured Text (ST), Sequential Function Chart (SFC)

Communication Protocols

• Ethernet/IP

• Modbus TCP

• HDLC Fieldbus

• PROFIBUS-DP and DeviceNet

Electrical & Power

• 24 VDC input with support for redundant power

• Typical power consumption: ≤ 8.5 W per non-redundant module

Environmental Ratings

• Operating Temperature: 0°C to +60°C

• Humidity: 5%–95% RH, non-condensing

• Industrial-grade IP-rated enclosure

Physical & Installation

• Rail-mounted for DIN rail or panel installation

• Compact form factor for efficient cabinet layout

• Certifications: CE, UL, RoHS, IEC 61131-2

Key Features

• High-performance PLC/control module for Foxboro Evo™ and I/A Series

• Supports up to 8 FBMs for scalable expansion

• Fault-tolerant design with redundant power input

• Multi-protocol communication: Ethernet/IP, Modbus TCP, HDLC, PROFIBUS-DP

• Industrial-grade design for continuous operation in harsh environments

• Advanced diagnostics and real-time processing

• Compact, rail-mounted installation for flexible cabinet layouts

Applications

Ideal for:

• Chemical and petrochemical plants

• Refineries and energy systems

• Power generation facilities

• Pharmaceutical manufacturing

• Aerospace and high-reliability industrial automation

FAQ

Q: How many Fieldbus Modules can RH923YUOB support?
A: Up to 8 FBMs can be connected for system expansion.

Q: Does it support fault-tolerant operation?
A: Yes, it supports dual-module fault-tolerant configurations with redundant power.

Q: Which industrial protocols are supported?
A: Ethernet/IP, Modbus TCP, HDLC Fieldbus, PROFIBUS-DP, and DeviceNet.