Yokogawa ARM55T Relay Board – Product Description

Overview

The Yokogawa ARM55T is a high-reliability relay board designed for industrial automation systems. It provides 32-point mechanical relay outputs for precise ON/OFF control of field devices. Moreover, its compact rack-mounted design ensures seamless integration into CENTUM VP DCS and ProSafe‑RS SIS systems, while offering dual-redundant support and strong isolation for mission-critical environments.

Technical Specifications

Electrical & I/O

• Number of Channels: 32-point mechanical relay outputs

• Contact Type: Wet contact, single or dual redundant

• Minimum Load: 5 V, 10 mA

• Terminals: M4 screws for field device connection

• Insulation Resistance: ≥10 MΩ (500 V DC)

• Input Power: 24 V DC via system backplane

Performance & Diagnostics

• Response Time: Fast switching suitable for industrial automation

• Reliability: Continuous operation in mission-critical systems

• Diagnostics: LED indicators for each channel status

• Redundancy: Supports dual-redundant configuration for fault-tolerant operation

Mechanical

• Dimensions (W × H × D): 482.6 × 177 × 150 mm (4U rack)

• Weight: 2.6 kg

• Mounting: Rack-mounted in Yokogawa system backplane

• Cooling: Natural convection

• Protection: IP20

Environmental & Compliance

• Operating Temperature: 0 °C to +50 °C

• Storage Temperature: −20 °C to +70 °C

• Relative Humidity: 10–90% RH

• Certifications: CE, UL, CSA (depending on configuration)

• Origin: Japan

FAQ

Q1: How many relay outputs does the ARM55T provide?
It provides 32 mechanical relay outputs with single or dual-redundant support.

Q2: What is the minimum load requirement?
The minimum load is 5 V and 10 mA per contact.

Q3: Can the board operate in redundant configurations?
Yes, it supports dual-redundant operation for fault-tolerant systems.

Q4: What type of field connections are supported?
M4 screw terminals allow secure connection to relays, lamps, or solenoids.

Q5: Which systems is it compatible with?
The ARM55T integrates seamlessly with Yokogawa CENTUM VP DCS and ProSafe‑RS SIS systems.