Foxboro RH926JM | I/A Series | 8-Slot Modular Baseplate

Product Description

The Foxboro RH926JM is a vertical mounting baseplate designed to support modular components within the Foxboro I/A Series distributed control architecture. It provides both the physical mounting structure and the electrical interconnection platform for Fieldbus Modules, control processors, and communication interfaces.

This baseplate incorporates a passive backplane design, reducing active component dependency and improving long-term system reliability. Dual power inputs and redundant communication paths are integrated to support high-availability configurations, particularly in systems requiring continuous operation.

The RH926JM is commonly installed in control cabinets where space efficiency, modular scalability, and fault tolerance are key design requirements.

Key Features

• Eight vertical slots for modular I/A Series components

• Dual 24 VDC inputs enabling redundant power supply configurations

• Redundant Fieldbus communication channels (A/B)

• Passive backplane architecture for improved reliability

• Mechanical design optimized for vertical cabinet installation

• Durable cast aluminum housing suitable for industrial environments

• Supports redundant processor configurations such as dual FCP setups

Technical Specifications

General Information

• Model: RH926JM

• Manufacturer: Foxboro 

• System Compatibility: Foxboro I/A Series, 200 Series modules

• Type: Modular baseplate for distributed control systems

• Country of Manufacture: USA

• Enclosure Material: Corrosion-resistant cast aluminum

Mechanical Characteristics

• Slot Capacity: 8 module positions

• Mounting Orientation: Vertical

• Dimensions: 17.5 × 5.5 × 2.5 inches

• Weight: 2.5 kg

• Installation: Panel-mounted within control cabinets

Electrical Specifications

• Input Power:

• Primary: 24 VDC

• Secondary: 24 VDC (redundant input)

• Backplane Type: Passive (no active electronic components)

• Communication Interfaces:

• Dual Fieldbus channels (Channel A and B)

• Time synchronization interface for coordinated control

Environmental Conditions

• Operating Temperature Range:

• Standard: 0°C to +60°C

• Extended installations: down to –20°C depending on enclosure design

• Storage Temperature: –40°C to +70°C (typical system-level rating)

• Humidity: 0–95% RH, non-condensing

• Environmental Suitability: Designed for industrial-grade applications

Module Compatibility

• Supports installation of:

• Fieldbus Modules (FBMs)

• Field Control Processors (FCP270 and similar)

• Communication modules (e.g., FCM, FBI series)

• Other 200 Series I/O and interface modules

Applications

• Centralized mounting platform in distributed control systems

• Control cabinets in chemical and petrochemical plants

• Oil refining and upstream/downstream operations

• Power generation and energy infrastructure

• Water and wastewater treatment facilities

• Mining and heavy industrial processing systems

FAQ

Q: What is the function of the RH926JM baseplate?
A: It provides both mechanical support and electrical interconnection for I/A Series modules, acting as the backbone of a modular DCS node.

Q: Does the baseplate support redundant configurations?
A: Yes, it includes dual power inputs and dual Fieldbus channels to enable redundant system architectures.

Q: Are active electronics included in the backplane?
A: No, the passive backplane design improves reliability by minimizing failure points.

Q: Which modules can be installed on this baseplate?
A: It supports FBMs, FCP processors, and various communication modules within the Foxboro I/A Series ecosystem.