Yokogawa ARM15A-000 Relay Board

Configured for high-density signal distribution in Centum VP control networks, the Yokogawa ARM15A-000 (ARM15A Relay Board) provides direct physical/electrical execution. It serves as a centralized termination interface that channels 32 dry contact inputs from field equipment into the digital processing layer of the distributed control system (DCS) through secure M4 terminal screw connections.

Suffix Breakdown & Model Matrix

The ARM15A series utilizes specific alphanumeric codes within its suffix architecture to define the mounting geometry, electrical configuration, and system application constraints:

• ARM15A: Core model identifier for the 32 Dry Contact Input Relay Board featuring M4 terminal blocks.
• 0: Standard fixed designator reserved for factory baseline validation.
• 0: 19-inch rack-mountable hardware layout designed for standard 3U cabinet rail integration.
• 0: Basic electrical type configuration optimized for direct single or dual-redundant mechanical relay contact input routing.

Hardware Specifications

Distributed Process Control & Fieldbus Topologies

• 4-20 mA HART Loop Protocol and Fieldbus Routing Layer The board coordinates physical digital state inputs across 32 independent channels concurrently. It acts as a passive marshalling plane that aggregates external mechanical contact closures, formatting the binary state transitions cleanly so they can be processed by downstream digital I/O modules and mapped directly onto the primary DCS backplane network registers.
• Channel-to-Channel Isolation and Optical Safety Controls Electrical protection is maintained via physical trace separations and isolated circuit paths between adjacent input channels on the board. This structural layout limits channel-to-channel crosstalk and isolates inductive switching transients, preventing a field ground fault on one mechanical contact from disrupting the logical operation of surrounding input channels.

Frequently Asked Questions

Q: How is dual-redundancy achieved on the passive ARM15A-000 interface board?

A: The board contains dual-routed circuit traces that split the 32 incoming field contact signals simultaneously into two independent output connectors. These connectors link via pre-fabricated cables to a pair of redundant digital input modules, allowing continuous signal processing even if one upstream DCS card fails or undergoes maintenance.

Q: What are the wetting voltage requirements for the 32 dry contact inputs routed to the M4 terminals?

A: Because the board interfaces with unpowered mechanical contacts, wetting voltage must be supplied externally or derived from the matching Yokogawa digital input module's internal power distribution rail (typically 24 VDC). Loop resistance and terminal torque must be checked to ensure consistent current flow across the dry contacts.