Description
Triconex 8120X Main Chassis (Tricon CX)
The part number 8120X designates the Main Chassis for the EcoStruxure Triconex Tricon CX safety system (manufactured by Schneider Electric). It acts as the core backplane interface designed to house and power the primary processing and communication infrastructure for the Tricon CX Triple Modular Redundant (TMR) safety architecture.
Key Architectural Specifications
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Manufacturer: Triconex (Schneider Electric)
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Product Series: Tricon CX Safety System
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Module Capacity:
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Accepts three Model 3009X Main Processor modules (enabling TMR processing).
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Accepts four communication modules arranged in two redundant pairs.
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Expansion & Networking: Interfaces with the Model 8131X I/O Expansion Chassis through triplicated RS-485 bi-directional communication ports.
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System Integration: Supports Foxboro Distributed Control System (DCS) time synchronization interfaces for direct Foxboro DCS mesh network integration.
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Power Supply: Powered by external dual-redundant 24 VDC power supplies to maintain high-availability fault tolerance.
8120X
Product Overview
8120X is the Main Chassis for Tricon CX TMR Fault-Tolerant Safety Control System manufactured by Triconex (Schneider Electric EcoStruxure platform). It serves as the core mechanical carrier and triple-redundant backplane foundation of the Tricon CX safety system.
This main chassis supports installation of 3 pcs 3009X Triple Main Processor modules, accommodates up to four communication modules (configured as two redundant pairs). It relies on triplicated RS485 I/O bus to connect extended 8131X I/O expansion chassis, forming a complete Tricon CX safety instrumented system (SIS). The backplane implements independent triple modular redundant TriBus, supporting 2oo3 voting logic, suitable for SIL3 safety interlock, burner management and turbine protection control.
Technical Specifications
| Item | Parameter |
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| Part Number | 8120X |
| Module Type | Tricon CX Main Control Chassis |
| Manufacturer | Triconex / Schneider Electric |
| Applicable Platform | Tricon CX Fault-Tolerant Safety System |
| Supported CPU | 3 × 3009X Main Processor Slots |
| Communication Slots | 4 slots for communication modules (2 redundant pairs) |
| Expansion Interface | Triplicated RS485 bus for linking 8131X I/O expansion chassis |
| Backplane Architecture | Triple Modular Redundant TriBus (2oo3 voting) |
| External Power Input | Redundant 24 VDC power supply (external power modules) |
| Mounting Standard | 19-inch standard cabinet rack mounting |
| Mechanical Material | Heavy-duty welded steel frame, black anti-corrosion coating |
| Hot Swap Support | Supports hot replacement of compatible modules without chassis power-off |
| Operating Temperature | 0 ℃ ~ +60 ℃ |
| Ambient Humidity | 5%–95% non-condensing |
| Protection Class | IP20 (must be installed inside control cabinet) |
| Safety Certification | IEC 61508 SIL3, ISA 84, IEC 61511 |
| Spare Part Status | OEM production discontinued; new surplus and refurbished chassis available |
Key Features
- Dedicated chassis for Tricon CX generation, matched exclusively with 3009X series processors; incompatible with older Tricon 8110 / 8120E hardware
- Triple redundant backplane bus realizes independent operation of A/B/C three channels, single channel fault will not cause system trip
- Supports redundant communication module configuration, improving communication reliability with upper DCS/SCADA
- Triplicated I/O expansion bus can cascade multiple 8131X I/O chassis to expand field signal acquisition capacity
- Mechanical keyed slot design prevents misplugging different types of modules
- Optimized internal air duct layout, ensuring stable heat dissipation under continuous heavy-load operation
- Built-in hardware monitoring circuit works with main processor to detect backplane and module connection faults
- Strict full part number verification required; cannot be interchanged with 8120E, 8110 and other chassis variants
- Core infrastructure spare part for maintenance and retrofit of Tricon CX safety interlock systems
