FOXBORO RH972KA Clock Synchronization Modules

The Foxboro RH972KA, also cataloged as the RH972KA Time Strobe Converter, operates as a high-precision hardware component for master clock pulse synchronization, fiber-to-electrical signal distribution, and downstream module coordination within Foxboro Distributed Control System (DCS) architectures.

Hardware Specifications

Process Control System Specifications

• Deterministic Synchronization Matrix Execution The module functions as a zero-latency signal arbitration link that converts incoming optical clock pulses into physical electrical waveforms. By transmitting time strobe data simultaneously across 8 isolated RS-422 differential outputs, it coordinates control processors and communication modules without introducing phase lag or scan jitter.
• Fiber-Optic Topology and Galvanic Noise Shielding The ST-terminated multi-mode fiber interface isolates the module electrically from the master clock source. This physical boundary eliminates high-voltage transients, radio frequency interference (RFI), and ground loops across a 2 km cable run, ensuring stable timing distribution in harsh EMI fields.

Frequently Asked Questions

Q: What is the mechanical function of the optical output port alongside the 8 electrical outputs?

A: The optical output duplicates the incoming multi-mode fiber strobe signal for continuation. This enables system engineers to daisy-chain the timing pulse to subsequent downstream units, supporting multi-drop network architectures of up to 50 interconnected RH972KA modules.

Q: How do the 8 differential RS-422 electrical outputs provide a benefit over standard single-ended outputs?

A: RS-422 utilizes dual-wire differential signaling, which inherently cancels common-mode noise and voltage spikes induced along the copper transmission lines. This configuration enables long, stable distribution runs between the converter and the target DCS processors.