Description
Product Overview
The Triconex 8120E is the primary 19-inch rack chassis for Tricon triple modular redundant (TMR) safety instrumented systems (SIS). It provides backplane TriBus communication, power distribution and mechanical mounting for Tricon processor modules, I/O cards, communication boards and redundant power supplies. Designed for fault-tolerant emergency shutdown (ESD), fire & gas (F&G), turbine protection and critical safety interlock systems, this chassis supports simplex, dual and triple redundant configurations for high-risk industrial processes.
Technical Specifications
| Item | Parameter |
|---|---|
| Part Number | 8120E |
| Manufacturer | Triconex (Emerson) |
| Product Family | Tricon SIS |
| Type | TMR Main Rack / Chassis Assembly |
| Rack Size | 19” rackmount, 8U height |
| I/O Slot Capacity | Up to 16 module slots for CPU, I/O and comms cards |
| Backplane Bus | TriBus TMR parallel backplane bus |
| Power Feed | Supports dual redundant 24VDC power supply modules |
| Operating Temp | -40 °C ~ +70 °C |
| Humidity | 5%–95% non-condensing |
| Safety Certification | IEC 61508 SIL3, FM, CSA, ATEX |
| Enclosure | Metal cabinet assembly, IP20 (for cabinet mounting) |
| Weight | ~25 kg fully assembled |
| Communication Ports | Front panel Ethernet, RS232/RS485 service interfaces |
Key Features
- TMR backplane architecture, with three independent parallel voting paths for fault tolerant operation
- 16 plug-in card slots to host Tricon CPU, analog/digital I/O, relay and communication modules
- Dual redundant power supply slots to eliminate single point of power failure
- Hot-swap support for individual I/O and processor modules without rack shutdown
- Built-in TriBus high-speed backplane for synchronous voting between the three TMR control lanes
- Integrated module status LED indicators for each card slot
- Conformal coated backplane option available for high humidity / corrosive plant environments
- Supports event sequence recording, trip data capture and online system diagnostics
- Certified for SIL3 safety applications in oil & gas, refinery, chemical and power generation
Application
Deployed in safety instrumented systems for refineries, natural gas plants, petrochemical complexes and thermal power stations. The 8120E chassis forms the core of ESD, F&G and turbine protection racks, hosting the Tricon TMR controller and all associated safety I/O modules for emergency process shutdown.
Installation & Maintenance Notes
- ESD protection is mandatory before handling backplane or inserting/removing modules
- Maintain adequate cabinet ventilation; avoid stacking heat-generating equipment directly adjacent
- Install dual redundant 24VDC power feeds to the rack for maximum fault tolerance
- Check backplane connector pins for oxidation or damage before installing replacement cards
- Complete full system proof test after chassis swap or major module replacement
- Separate safety TriBus wiring from non-safety DCS and low-level analog instrument cables
- Back up the Tricon control database before any rack or backplane maintenance work
FAQ
Q: What is the difference between 8120 and 8120E? A: The 8120E is the enhanced revision of the original 8120 chassis, with improved backplane circuit noise immunity and extended temperature rating.
Q: Can I mix old and new series Tricon modules inside the 8120E rack? A: Most Tricon classic series I/O and CPU modules are compatible, but firmware version matching is required before commissioning.
Q: Does the 8120E include CPU and I/O cards? A: No. 8120E is only the empty rack chassis and backplane; processors, I/O modules and power supplies are sold separately.
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