Yokogawa SARM15A Relay Board

Configured for multi-channel discrete status monitoring in Yokogawa industrial control and safety platforms, the Yokogawa SARM15A (SARM15A Relay Board) provides direct physical/electrical execution. The solid-state sub-assembly conditions and filters binary dry-contact parameters directly at the hardware tier to update centralized register states over the system I/O backplane bus.

Hardware Specifications

Process Control & DCS Instrumentation Rails

• Multi-Channel Isolation and Noise Suppression Rails The internal circuit topology incorporates dedicated galvanic separation boundaries across all 32 individual input pathways. This electrical barrier shields the internal system logic from field-side voltage fluctuations, common-mode noise, and potential ground loop deltas, ensuring clean binary tracking without register corruption across the shared backplane bus.
• 4-20 mA HART Loop Protocol Coexistence and System Safety While engineered to process high-density discrete monitoring fields, the module operates inside cabinet enclosures alongside analog instrumentation running the 4-20 mA HART loop protocol. Built-in hardware input filtering and noise suppression elements isolate inductive contact bounce and electromagnetic interference, preventing localized electrical noise from distorting adjacent low-level analog measurement paths.

Frequently Asked Questions

Q: How do the exact input loop resistance thresholds govern status sensing reliability?

A: The input monitoring circuit recognizes an active ON state when the field circuit resistance is 150 Ohm or less, confirming solid loop closure. It registers an inactive OFF state when the loop resistance exceeds 150 Ohm, preventing minor line leakage currents or contact contamination from causing false state transitions in the controller memory registers.

Q: What mechanisms dictate the deployment of the board within redundant safety systems?

A: The physical wiring interface allows parallel input signals from a single field contact array to route into dual-redundant Yokogawa I/O modules simultaneously. This physical architecture ensures that if one upstream I/O card channel encounters a components failure, the redundant tracking branch continues updating system registers without contact chatter or state tracking latency.