Yokogawa ARM15A-000 Relay Terminal Boards

Configured for high-density discrete signal routing within industrial monitoring networks, the Yokogawa ARM15A-000 (ARM15A Relay Board) provides direct physical/electrical execution.

Suffix Breakdown & Model Matrix

• ARM15A: Base model designation representing 32 dry contact inputs equipped with M4 screw terminals.
• -0: Always fixed at 0 as per baseline factory revision parameters.
• 0: Designates a 19-inch rack-mountable physical configuration (3U height).
• 0: Indicates the basic hardware version.

Hardware Specifications

Process Control and DCS Instrumentation

• Channel-to-Channel Isolation: The layout features electrical separation barriers across all 32 dry contact input circuits, preventing field-side electrical surges or ground loops from transferring to the core DCS input modules.
• Dual-Redundant Configuration Pathing: Circuit board traces support both single-terminal processing and dual-redundant multi-cable branching, allowing critical mechanical contact monitoring to continue even during single-link signal disruptions.

Frequently Asked Questions

Q: What are the installation advantages of the integrated M4 screw terminals?

A: The physical M4 terminals offer high-vibration resistance and secure surface-area contact for industrial ring and spade wire lugs. This ensures terminal connections do not back out or introduce signal resistance over time.

Q: How does this relay board behave during input power disruptions?

A: Because the ARM15A-000 is built as a dry contact passive input termination board, it does not contain onboard active power supplies. Field signal status is registered directly by the digital inputs of the connected control system, providing a fail-safe mechanical interface.

Field Installation Guidelines

• 19-Inch Cabinet Rail Fastening: Secure the 3U chassis panel to the standard 19-inch rack rail using four structural screws and lock washers. Ensure the assembly is level to prevent mechanical stress across the terminal strips.
• Signal Cable Routing and Separation: Route all field-contact wire bundles away from heavy AC power distribution lines inside the cabinet. Use integrated strain relief bars to prevent terminal block screw fatigue.
• Dry Contact Loop Resistance Testing: Prior to system commissioning, verify that total loop resistance across each field switch contact path remains within the limits defined by the upstream DCS input card specifications.