Foxboro RH928BA PLC Processor Module I/A Series

Product Description

The Foxboro RH928BA is a rail-mountable control processor designed for use within Foxboro I/A Series and Foxboro Evo distributed control platforms. It functions as the central execution unit in a modular control system, responsible for processing control logic, managing I/O data exchange, and coordinating communication across distributed networks.

Built for continuous operation in industrial environments, the module combines embedded processing capability with redundant power input design and multiple communication interfaces. It integrates seamlessly with Foxboro baseplates and I/O subsystems, allowing flexible system expansion and straightforward maintenance.

The RH928BA supports both standalone and fault-tolerant configurations, making it suitable for critical applications where uptime and system resilience are essential.

Technical Specifications

Processing & Memory

• CPU: Industrial-grade embedded processor (Celeron-class architecture)

• RAM: 512 MB

• Flash Storage: 1 GB

• Alternate Configuration:

• 16 MB SDRAM

• 32 MB Flash (non-redundant systems)

Power Requirements

• Input Voltage: 24 VDC nominal

• Redundancy: Dual power input supported

• Power Consumption: ≤ 8.5 W

Communication Interfaces

• Ethernet (industrial network communication)

• Serial Interfaces: RS-232, RS-485

• Protocol Support: Modbus TCP/IP and serial protocols

Environmental Ratings

• Operating Temperature:

• Standard: 0 °C to +60 °C

• Extended: –40 °C to +85 °C

• Humidity: 0% to 95% RH, non-condensing

• Vibration Resistance: Up to 5 g RMS (10–500 Hz)

• Shock Resistance: 15 g, 11 ms half-sine

• Enclosure Protection: NEMA 4X-rated (dust-tight, water-resistant)

Mechanical Details

• Mounting: DIN rail or compatible modular baseplate

• Dimensions: 120 × 60 × 30 mm

• Weight: 0.5 kg

• Construction: Reinforced industrial housing

Key Features

• Centralized CPU for distributed control and I/O coordination

• Supports redundant configurations for fault-tolerant systems

• Multiple communication interfaces for flexible integration

• Industrial-grade design for extreme temperature and vibration conditions

• Modular architecture simplifies upgrades and maintenance

• Compatible with Foxboro I/A Series and Evo system ecosystems

Application Scenarios

• Pipeline monitoring and control in oil & gas operations

• Turbine and boiler control in power generation plants

• Continuous and batch processing in petrochemical facilities

• Water treatment and distribution automation

• Large-scale distributed manufacturing systems

FAQ

Q: Does the RH928BA support redundancy?
A: Yes. It can be deployed in dual-processor configurations to achieve fault-tolerant control operation.

Q: What communication protocols are available?
A: The module supports Ethernet-based protocols such as Modbus TCP/IP, along with serial communication via RS-232 and RS-485.

Q: Can it be installed without a baseplate?
A: It is designed primarily for integration with Foxboro modular baseplates, although DIN rail mounting is supported depending on system configuration.