Product Core Brief

• Model: YNT511D
• Brand: YOKOGAWA
• Series: CENTUM CS / V-NET
• Core Function: Amplifies and isolates optical signals for V-NET bus communication.
• Product Type: Bus Repeater Rack
• Key Specs: Optical Isolation | High Anti-Interference | 24VDC
• Condition: New Surplus / Original

Product Introduction

YOKOGAWA YNT511D serves as a critical optical bus repeater for V-NET systems. This YOKOGAWA YNT511D unit amplifies, isolates, and converts signals to maintain network integrity across long distances.

Engineered for harsh industrial environments, the YOKOGAWA YNT511D offers superior noise immunity. It ensures stable data transmission even with significant electromagnetic interference present.

Key Technical Specifications

Quality Control Process

We don’t just visually inspect these repeaters. Every YOKOGAWA YNT511D undergoes active signal injection testing. We verify optical output levels match factory specs using calibrated power meters. Ground continuity checks prevent future isolation failures. Power supply ripple is measured under load to ensure clean DC delivery. Finally, we perform a 4-hour burn-in at elevated temperature. Units failing thermal stability are scrapped immediately.

Replacement Pitfall Guide

❗ Verify Optical Fiber Type: Don’t assume multimode compatibility. Older YOKOGAWA YNT511D racks often use specific core diameters. Mismatched fiber causes intermittent packet loss that looks like a CPU fault.

❗ Check Grounding Straps: This unit relies on chassis ground for noise rejection. Missing or corroded grounding straps will introduce bus errors within hours of startup. Clean contact points thoroughly.

❗ Backplane Power Draw: Adding this repeater increases rack load. Calculate total 24VDC consumption before installation. Overloading the power supply causes voltage sag and random resets.

❗ Termination Resistors: Some revisions require external termination. Check the silkscreen on the PCB. Missing termination reflects signals and corrupts data frames.

Keep these in mind and you’ll cut 90% of rework time.

Compatibility Matrix & Benchmarks

• Signal Latency: < 1μs per repeater stage
• Optical Wavelength: 850nm (Multimode Standard)

Need help with cabling specs for the V-NET optical bus? I can pull the fiber type and distance limits for your configuration.