Overview
Configured for remote I/O communication in Tricon safety instrumented systems, the Invensys Triconex 4200 (4200 Primary Remote Extender Module) transfers the triplicated I/O communication path between the main chassis and remote RXM location through multi-mode fiber-optic links.
Hardware Specifications
| Parameter | Specification |
|---|---|
| Model | 4200 |
| Brand | Invensys Triconex |
| Product Type | Primary Remote Extender Module (RXM) |
| System | Tricon Safety Instrumented System |
| Architecture | Triple Modular Redundant (TMR) |
| Installation Location | Primary / Main Chassis |
| Remote Module | 4201 / 4201-3 |
| Complete Set | 4200-3 |
| Fiber Type | Multi-mode fiber optic |
| Maximum Cable Length | 2 km (1.2 miles) |
| Communication Speed | 375 kbit/s |
| Remote Locations Supported | Up to 3 |
| Connector Type | ST fiber-optic connectors |
| Connections per Remote Site | 6 |
| Communication Method | Fiber-optic point-to-point |
| Diagnostic Indicators | PASS, FAIL, ACTIVE, TX, RX1, RX2, RX3 |
TMR Fiber-Optic Communication
The 4200 provides the primary-side interface for the Tricon remote I/O communication path. A 4200-3 configuration contains three primary RXM modules that correspond to the three communication channels in the TMR architecture.
The module communicates with the corresponding 4201-3 remote RXM set through multi-mode fiber-optic cables. The documented communication rate is 375 kbit/s, while the maximum multi-mode fiber distance is 2 km (1.2 miles).
The optical path provides electrical isolation between the primary and remote chassis. It also separates the communication path from electrical interference associated with copper signal wiring. Each remote location requires six fiber connections for the triplicated communication arrangement.
Frequently Asked Questions
Q: What remote module works with the Triconex 4200?
A: The 4200 operates with the corresponding 4201 remote RXM. The documented three-module configuration is 4200-3 with 4201-3.
Q: What fiber type does the 4200 use?
A: The 4200 uses multi-mode fiber-optic cable with ST fiber-optic connectors.
Q: What is the maximum documented communication distance?
A: The supplied documentation specifies a maximum multi-mode fiber distance of 2 km (1.2 miles).
Field Installation Guidelines
Install the 4200 in the designated primary RXM chassis position and connect it to the corresponding remote RXM assembly through the specified fiber-optic interface.
First, verify the module identification, hardware revision, connector arrangement, and chassis compatibility. Next, route the multi-mode fiber according to the applicable Tricon installation requirements. Avoid excessive mechanical stress, sharp bends, contamination, or improper termination at the ST connectors.
For a TMR installation, maintain the three independent communication paths and verify the fiber connections for each remote location. Confirm the PASS, FAIL, ACTIVE, TX, RX1, RX2, and RX3 indicators during commissioning. Also verify the complete optical path before placing the remote I/O chassis into service.
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