ARM55D-000/BR3 | Yokogawa | 32-Channel Dry Contact Relay Board

Product Overview

The ARM55D-000/BR3 is a multi-channel mechanical relay interface board developed by Yokogawa for use within CENTUM VP distributed control systems. It acts as an intermediary between digital I/O modules and field wiring, enabling safe signal handoff through physical relay isolation.

Designed for 24 VDC dry contact signals, this relay board enhances system reliability by separating control electronics from field-side disturbances such as noise, voltage transients, or wiring faults. Its construction and terminal layout are optimized for long-term industrial operation where signal integrity and maintainability are critical.

Core Functions and Design Characteristics

The ARM55D-000/BR3 relay board provides 32 independent relay channels, each using a mechanical contact to ensure true galvanic separation. This architecture is particularly suitable for safety-related or electrically noisy installations where solid-state isolation alone is insufficient.

Relay outputs are routed via robust screw terminals, allowing direct connection to field devices without additional interface components. The board is engineered to integrate directly with Yokogawa digital I/O modules using compatible signal cable assemblies.

Technical Specifications

• Model: ARM55D-000/BR3
• Manufacturer: Yokogawa Electric Corporation
• Product Type: Mechanical Relay Interface Board
• Relay Channels: 32 dry contact inputs
• Rated Control Voltage: 24 VDC
• Maximum Contact Current: 650 mA per channel
• Isolation Method: Mechanical relay (galvanic isolation)
• Terminal Type: M4 screw terminals
• Compatible Signal Cables: AKB331 series
• Compatible I/O Modules: ADV151, ATD5A digital I/O modules
• System Compatibility: CENTUM VP, Yokogawa FIO architecture
• ​Weight: 3.20 lbs

System Compatibility and Integration

The ARM55D-000/BR3 is designed to operate seamlessly within Yokogawa’s ARM relay board ecosystem. It supports standard digital input and output signal handling when paired with compatible CENTUM VP I/O modules, ensuring predictable signal behavior and simplified system diagnostics.

Its mechanical relay design makes it suitable for both standard and redundant I/O configurations, depending on the control system architecture.

Typical Application Scenarios

This relay board is commonly deployed in process control environments requiring reliable discrete signal isolation, including chemical processing units, oil and gas facilities, power generation plants, and continuous manufacturing lines. It is especially useful where field wiring is exposed to electrical interference or where additional protection for controller I/O is required.

Frequently Asked Questions

What is the primary role of the ARM55D-000/BR3? It provides electrical isolation and signal switching between Yokogawa digital I/O modules and external field devices using mechanical relays.

Is this board suitable for safety-critical signals? Yes, mechanical relay isolation makes it appropriate for applications where physical separation is required, subject to system design and compliance requirements.

Can it be used with non-Yokogawa systems? The board is mechanically and electrically designed for Yokogawa CENTUM VP platforms; use outside these systems is not recommended without engineering validation.