Yokogawa 3500/42 176449-02 with TMR (Triple Modular Redundant) Base 128229-01 - TMR Relay Module
Description:
The Yokogawa 3500/42 176449-02 is a specialized Relay Module designed to operate on the TMR (Triple Modular Redundant) baseplate 128229-01. This combination creates a highly reliable, fault-tolerant relay module for the Yokogawa 3500 Machinery Management System. Unlike a standard relay module, this TMR configuration incorporates three independent relay circuits per channel. A built-in voting logic ensures that a single component failure within the module does not cause a spurious (false) trip of the machinery, while still guaranteeing a valid trip command when required. This design is essential for achieving high Safety Integrity Levels (SIL) in critical process shutdown and machinery protection systems.
Specifications / Parameters
| Parameter | Specification |
|---|---|
| Model | 3500/42 176449-02 (Module) & 128229-01 (TMR Base) |
| Product Type | TMR (Triple Modular Redundant) Quad-Channel Relay Module |
| Rack Compatibility | Yokogawa 3500 Series Rack |
| Configuration | Requires the module (176449-02) to be installed on the dedicated TMR base (128229-01). |
| Number of Channels | 4 independent channels |
| Redundancy | Triple Modular Redundant (TMR) architecture per channel. |
| Contact Form | Form C (SPDT - Single Pole Double Throw) for each channel. |
| Contact Rating | Consult the official manual for specific ratings (e.g., 2A @ 30VDC resistive). Critical for design. |
| Safety | Designed to prevent spurious trips and ensure safe operation on demand (SIL rated). |
| Module Slots | Occupies a single slot in a 3500 series rack (using the TMR baseplate). |
| Dimensions (H x W) | Standard 3500 Module Size: Approximately 132 mm (H) x 62 mm (W) The TMR baseplate has the same frontal dimensions. |
| Depth | Varies with rack and connector. The assembly is deeper than a standard module. |
| Weight | Approximately 0.7 kg (1.5 lb) (for the module and baseplate assembly) |
Note: For mission-critical applications, always verify all parameters, especially contact ratings and SIL certifications, against the latest official Yokogawa documentation. Dimensions and weight are typical values.
Application Scenarios
This TMR Relay Module is deployed in the most critical applications where both operational availability and safety are paramount. Its key application scenarios include:
Safety Instrumented Systems (SIS) / Emergency Shutdown (ESD) Systems:
Used as the final element to execute a safety shutdown for critical equipment like gas compressors or turbines in processes where an uncontrolled failure could have severe consequences. Its TMR design is essential for achieving the required Safety Integrity Level (SIL 2 or SIL 3).
High-Reliability Turbomachinery Protection:
Protects extremely high-value assets such as turbogenerators in power plants or main refrigerant compressors in LNG plants. The architecture minimizes the risk of a false trip, which itself can be very costly and damaging, while ensuring the machine trips if a genuine danger is detected.
Process Industries with Zero-Tolerance for Spurious Trips:
Ideal for applications in industries like Oil & Gas, Petrochemicals, and Pharmaceuticals, where an unplanned shutdown can lead to massive production losses, flaring, or safety incidents. The TMR voting logic ensures system stability.
Critical Compressor and Pump Trains:
Used on trains where a single shutdown can halt an entire production line or process. The module provides the highest assurance that the protection system will only operate when a true fault condition exists.
Applications Requiring High Hardware Fault Tolerance:
Mandated in safety system designs where a single fault within the shutdown logic subsystem must not prevent the system from performing its safety function. The TMR design provides this high level of fault tolerance.
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