Yokogawa SARM55C Terminal Board

Overview

The Yokogawa SARM55C Terminal Board is a 32-channel relay output interface designed to provide reliable field wiring connectivity for Yokogawa rack-based control systems. It integrates electromechanical relays with screw-terminal connections to safely switch external devices in industrial process, safety, and interlock applications.

This terminal board pairs with the SARM55C output module, converting low-level control signals into robust relay-driven outputs, making it suitable for critical alarm, annunciation, motor interlock, and solenoid control tasks.

Key Features

• 32 relay output channels with Form A or Form C relays depending on model

• Channel-to-channel and channel-to-system isolation for enhanced safety

• Inductive load suppression to protect relays from voltage spikes

• Rack-mounted design compatible with Yokogawa I/O frames

• Industrial-grade PCB construction with protective coating for harsh environments

• M4 screw terminals for secure and reliable field connections

Technical Specifications

General Specifications

• Model: SARM55C Terminal Board

• Function: Relay output interface for 32 digital channels

• Mounting: Rack-mounted, compatible with Yokogawa I/O systems

• Weight: 2.2 kg

Electrical Specifications

• Output Channels: 32

• Output Type: Relay contact

• Rated Voltage: 24 V DC (field-supplied)

• Contact Rating: Suitable for low- to medium-power loads, including solenoids, lamps, interposing relays, alarms

• Isolation: Channel-to-channel, channel-to-system

• Protection: Inductive suppression and noise-resistant design

Environmental Specifications

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

• Humidity: Non-condensing, industrial tolerance

• Vibration/Shock: Designed for harsh plant environments

Applications

• Process control systems

• Emergency shutdown (ESD) and interlock circuits

• Alarm and annunciation outputs

• Motor and valve interlocks

• Solenoid or relay actuation for field devices

FAQ

Q: Can the SARM55C handle AC loads?
A: This terminal board is primarily designed for DC field supply, but relay ratings for AC loads depend on the relay variant. Always verify the relay specifications.

Q: Is this terminal board compatible with redundant systems?
A: Yes, it supports both single and redundant control architectures within Yokogawa systems.

Q: How does it compare with similar Yokogawa relay boards?
A: The SARM55C offers 32 channels with full isolation and robust protection, making it ideal for medium-power field devices, whereas smaller models may support fewer channels or lower power ratings.