Description
TRICONEX 8112 Remote Expansion Chassis
Key Technical Specifications
| Parameter | Specification |
|---|---|
| Manufacturer | Triconex / Schneider Electric |
| Model | 8112 |
| Product Type | Remote Expansion Chassis |
| Configuration | High-density |
| System | Tricon SIS |
| Architecture | TMR |
| Applicable Versions | Tricon v9.0–v11.x |
| I/O Slots | 6 I/O module positions |
| Remote Interface | RXM module position |
| Main Chassis Relationship | Used with Tricon main chassis such as 8110 |
| Expansion Cable | Tricon I/O bus expansion cabling |
| Chassis Application | Remote placement of I/O and communication hardware |
The Tricon technical product guide identifies 8112 as the High-Density Remote Expansion Chassis, while 8110 is the high-density main chassis and 8111 is the high-density local expansion chassis.
Product Introduction
The TRICONEX 8112 is the high-density Remote Expansion Chassis used in Tricon safety instrumented systems. Its purpose is to extend the physical I/O architecture away from the main chassis while retaining the Tricon system’s redundant architecture. It is a chassis-level component, so it should not be specified as a CPU, power module, or individual I/O card.
In documented Tricon v9–v11 configurations, the 8112 provides one RXM module position and six I/O-module positions. The chassis works with the appropriate Tricon remote-expansion hardware and bus cabling, allowing field I/O to be distributed without moving the main processor chassis closer to the process.
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Application Scenarios & Field Pitfalls — The Engineer’s Perspective
Engineering Pain Point
Long field wiring runs are a recurring problem in large SIS installations. They increase cable quantity, cabinet congestion, termination points, and troubleshooting effort. The 8112 remote expansion chassis addresses the physical distribution problem by placing Tricon I/O hardware closer to remote process areas while maintaining the Tricon system architecture.
Typical Applications
- Remote Tricon SIS I/O installations
- Oil and gas emergency shutdown systems
- Petrochemical process safety systems
- Power-generation and other safety-critical process installations
Technical Pitfalls
1. Do not confuse 8112 with 8111.
The 8111 is the high-density local expansion chassis. The 8112 is specifically the remote expansion chassis. Their physical appearance and chassis-level roles can make them easy to confuse during spare-parts procurement.
2. 8112 is not an I/O module.
The chassis provides mounting and system-bus infrastructure. The actual process signal functions remain in the installed Tricon I/O modules. Ordering an 8112 does not replace a failed DI, DO, AI, AO, or communication module.
3. Check the RXM configuration.
Remote expansion requires the appropriate remote-expansion interface hardware and cable arrangement. The 8112 should be evaluated together with the installed RXM modules and Tricon chassis configuration rather than as an isolated mechanical rack.
4. Verify the Tricon system generation.
The 8112 is associated with the high-density Tricon architecture and is documented for v9–v11 configurations. A chassis from another Tricon generation should not be assumed interchangeable solely because the module slots look similar.
5. Do not use generic 24 VDC chassis specifications.
Some commercial listings incorrectly describe 8112 as a powered controller or give it generic voltage, protocol, IP-rating, or I/O-channel specifications. Those descriptions should not be used for engineering procurement. The 8112 is fundamentally a remote expansion chassis, not a standalone powered controller.
6. Inspect the chassis before accepting a used spare.
For legacy Tricon equipment, inspect the backplane connectors, module guides, chassis grounding points, cable interfaces, mechanical damage, and evidence of corrosion or previous field modification. A clean chassis with damaged backplane contacts can still create intermittent system faults.
Related Products
- TRICONEX 8110 — High-density Tricon main chassis; houses the primary processor and system hardware.
- TRICONEX 8111 — High-density local I/O expansion chassis; intended for local rather than remote expansion.
- TRICONEX 8121 — Enhanced low-density expansion chassis.
- TRICONEX 8310 — 120 VAC/VDC, 175 W Tricon power module.
- TRICONEX 8311 — 24 VDC, 175 W Tricon power module.
- TRICONEX 8312 — 230 VAC, 175 W Tricon power module.
- TRICONEX 3008 — Tricon main processor used in applicable v9.6–v10.x systems.
- TRICONEX 3009 — Main processor associated with Tricon v11 systems.
- TRICONEX 9000 — I/O bus expansion cable set used for Tricon chassis expansion.
Procurement Note
For a TRICONEX 8112, confirm the Tricon system version, remote-expansion architecture, RXM configuration, installed I/O modules, and required expansion cables before purchase. The chassis itself is only one part of the remote I/O assembly. For a running SIS, physical compatibility should be checked against the existing chassis and bus configuration rather than relying on the model number alone.
