Overview
The Triconex 8112 is a remote expansion chassis for the Tricon fault-tolerant controller. It provides the mechanical and communication interfaces required to connect remote I/O modules to the controller system. Its design includes three isolated RS-485 I/O bus channels, six backplane bus connectors and a 2 Mbit/s module communication link. Furthermore, its 19-inch rack format supports integration into an industrial control cabinet.
Chassis Design and Construction
The 8112 uses a welded steel enclosure with a black zinc-plated finish. Its 19-inch industrial rack assembly has defined width, height and depth dimensions for cabinet layout planning. Meanwhile, mechanically keyed slot guides help position and retain modules in their designated locations.
Communication and Bus Architecture
The chassis uses three isolated RS-485 channels for triplicated I/O bus communication at 375 kbit/s. This arrangement forms part of the Tricon system’s triple modular redundant (TMR) architecture. In addition, the module communication link operates at 2 Mbit/s, while six backplane bus connectors provide the specified expansion interfaces.
Controller Operation and Configuration
The chassis includes a RUN-PROGRAM-STOP-REMOTE keyswitch for selecting the controller operating mode. Engineers use TriStation 1131 configuration software to configure the Tricon system. Therefore, replacement planning should account for the installed hardware arrangement, communication connections and project configuration.
Technical Specifications
| Parameter | Specification |
|---|---|
| Model | 8112 |
| Brand | Invensys |
| Product Type | Remote Expansion Chassis |
| System Platform | Tricon Fault-Tolerant Controller |
| Mechanical Format | 19-inch industrial rack assembly |
| Chassis Fabrication | Black zinc-plated welded steel |
| Overall Width | 48.3 cm |
| Overall Height | 57.8 cm |
| Overall Depth | 45.1 cm |
| I/O Bus Architecture | Three isolated RS-485 channels |
| I/O Bus Rate | 375 kbit/s |
| Communication Bus Rate | 2 Mbit/s |
| Expansion Ports | Six backplane bus connectors |
| Controller Keyswitch | RUN-PROGRAM-STOP-REMOTE |
| Module Retention | Mechanically keyed slot guides |
| Engineering Software | TriStation 1131 |
| Safety Architecture | Triple Modular Redundant (TMR) |
| Stock | 1 unit |
Frequently Asked Questions
Q: What is the function of the Triconex 8112?
A: The 8112 serves as a remote expansion chassis for the Tricon fault-tolerant controller. It provides the rack structure and backplane communication interfaces for the installed system hardware.
Q: What communication architecture does the 8112 use?
A: It uses three isolated RS-485 I/O bus channels operating at 375 kbit/s. The specified module communication link operates at 2 Mbit/s.
Q: What should be checked before replacing an 8112 chassis?
A: Check the complete model number, nameplate, hardware revision, connector layout and installed system configuration. Furthermore, verify the chassis, baseplate, cables and field termination requirements against the existing installation before ordering a replacement.
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