Foxboro RH928AL PLC Baseplate Backplane I/A Series

Product Description

The Foxboro RH928AL is a modular baseplate designed to serve as the structural and electrical backbone for Foxboro I/A Series and Spectrum Distributed Control Systems. It provides a unified platform for installing control processors and distributed I/O modules while managing internal communication and power distribution.

Acting as both a mounting carrier and backplane, the unit enables seamless integration of multiple system components into a scalable architecture. It supports redundant 24 VDC inputs, ensuring continuous operation in critical process environments. Its design is optimized for remote I/O deployments, where reliability and system expandability are essential.

The RH928AL is built for industrial durability, maintaining stable performance under vibration, electrical interference, and extended temperature ranges typical of field installations.

Technical Specifications

General Characteristics

• Model: RH928AL

• Module Type: Modular PLC Baseplate / Backplane

• System Compatibility: Foxboro I/A Series and Spectrum DCS

• Functional Role: Mechanical mounting, power distribution, and signal backplane

Electrical Parameters

• Supply Voltage: 24 VDC nominal

• Redundancy: Dual power input supported

• Power Distribution: Integrated across backplane bus

• Processor Compatibility: Supports Foxboro control processors and I/O modules

Environmental Ratings

• Standard Operating Range:

• Temperature: 0 °C to +60 °C

• Humidity: 5% to 95% RH (non-condensing)

• Extended Industrial Range:

• Immunity: EN 61000-6-2

• Emission: EN 61000-6-4

• Temperature: –40 °C to +70 °C

• Vibration Resistance: Up to 5 g RMS

• Shock Resistance: Up to 30 g

• EMC Compliance:

Mechanical Details

• Mounting Method: DIN rail or rack-mounted baseplate

• Form Factor: Modular, slot-based configuration (size depends on I/O capacity)

• Weight: 1.0 kg

• Construction: Industrial-grade metal and reinforced housing

Key Features

• Centralized backplane for system-wide communication and power distribution

• Modular architecture supports flexible I/O expansion

• Redundant power input increases system availability

• Designed for distributed and remote I/O topologies

• High resistance to EMI, vibration, and mechanical stress

• Compatible with a wide range of Foxboro control and I/O modules

Application Scenarios

• Distributed Control Systems in oil & gas production

• Petrochemical and refining facilities

• Power generation and utility infrastructure

• Large-scale manufacturing automation

• Remote I/O stations requiring scalable architecture

FAQ

Q: What is the primary function of the RH928AL?
A: It acts as a baseplate and backplane, providing mechanical support, internal communication paths, and power distribution for connected modules.

Q: Does this module perform control logic?
A: No. It is not a controller; it hosts processors and I/O modules that execute control functions.

Q: Can the system operate with redundant power supplies?
A: Yes. The baseplate supports dual 24 VDC inputs to improve system reliability and uptime.