Yokogawa ARM55W-000 32-Channel Mechanical Relay Output Board

Product Overview

The ARM55W-000 relay output board from Yokogawa Electric Corporation is a field I/O relay interface designed for CENTUM VP and ProSafe-RS control architectures. It converts digital output signals from Yokogawa FIO modules into isolated mechanical relay contacts suitable for directly driving field equipment.

Built for continuous operation in industrial control cabinets, this board delivers stable wet-contact switching, supports redundant I/O configurations, and ensures electrical isolation between the control system and external loads.

Functional Description

The ARM55W-000 operates as an intermediary layer between digital output modules and field devices. Instead of transmitting transistor-level signals, it employs mechanical relays to provide physically isolated contact outputs, improving noise immunity and load-handling capability.

Each channel is independently driven and suitable for both normally open and normally closed output logic, depending on wiring configuration. The board is engineered for high availability systems where output reliability and fault tolerance are critical.

Key Technical Characteristics

The ARM55W-000 features a dense 32-channel design while maintaining sufficient creepage distances and thermal stability for long-term operation.

Typical characteristics include:

• Mechanical relay outputs with wet-contact switching
• Total output channels: 32
• Supported contact forms: NO or NC (field-selectable)
• Control signal voltage: 24 V DC from digital output module
• Maximum switching capacity: 250 V AC at up to 10 A
• Electrical isolation between control and load circuits
• Designed for redundant digital output module configurations

Environmental and Mechanical Specifications

The board is suitable for installation in standard industrial enclosures and control cabinets.

• Operating temperature range: –20 °C to +70 °C
• Storage temperature range: –40 °C to +85 °C
• Relative humidity: 5% to 95% RH, non-condensing
• Protection rating: IP20 (cabinet installation required)
• Mounting method: DIN rail or panel mount
• Compact form factor optimized for FIO racks

System Compatibility

The ARM55W-000 is intended for seamless integration with Yokogawa’s FIO subsystem and is commonly paired with ADV-series digital output modules. It fully supports system-level redundancy and diagnostic monitoring as implemented in CENTUM VP and ProSafe-RS platforms.

Typical Application Scenarios

This relay output board is widely deployed in systems requiring electrically isolated switching of moderate to high loads, including:

• Solenoid valve and actuator control
• Motor starter and interposing relay switching
• Safety-related auxiliary outputs in power plants
• Oil and gas process control cabinets
• Utility and water treatment automation systems

Frequently Asked Questions

Q: Does the ARM55W-000 provide dry or wet contacts?
A: The board uses mechanical relays and is designed for wet-contact applications where the external circuit supplies the load voltage.

Q: Can it be used in redundant output configurations?
A: Yes. The board is designed to support dual-redundant digital output modules in Yokogawa FIO systems.

Q: Is this board suitable for high-current loads?
A: Each channel can handle up to 10 A at 250 V AC, making it suitable for many industrial field devices when properly protected.