Triconex is both the name of an Invensys company that supplies products, systems and services for safety, critical control and turbomachinery applications and the name of its hardware devices that utilize its TriStation application software. Triconex products are based on patented Triple modular redundancy (TMR) industrial safety-shutdown technology. Today, Triconex TMR products operate globally in more than 11,500 installations, making Triconex the largest TMR supplier in the world
Fault tolerance in the Tricon is achieved by means of a Triple-Modular Redundant(TMR) architecture. The Tricon provides error-free, uninterrupted control in the presence of either hard failures of components, or transient faults from internal or external sources. The Tricon is designed with a fully triplicated architecture throughout, from the input modules through the Main Processors to the output modules. Every I/O module houses the circuitry for three independent legs. Each leg on the input modules reads the process data and passes that information to its respective Main Processor. The three Main Processors communicate with each other using a proprietary high-speed bus system called the TriBus. Once per scan, the three Main Processors synchronize and communicate with their two neighbors over the TriBus. The Tricon votes digital input data, compares output data, and sends copies of analog input data to each Main Processor. The Main Processors execute the userwritten application and send outputs generated by the application to the output modules. In addition to voting the input data, the TriBus votes the output data. This is done on the output modules as close to the field as possible, in order to detect and compensate for any errors that could occur between the Tricon voting and the final output driven to the field.
The Triconex system usually consists of the following typical modules:
- Main Processor modules (triple).
- Communication module(s) .
- Input and output modules: can be analog and/or digital and work singular or in hot-spare (standby).
- Power supply modules (redundant).
- Backplane(s) (chassis) that can hold the previous modules.
- System cabinet(s): can compact one or more chassis in one cabinet.
- Marshalling cabinets to adapt and standardize interface connections between the field instruments and the Triconex system cabinets.
- Human machine interface (HMI) to monitor the events.
- Engineering workstation (EWS) for programming. monitoring, troubleshooting and updating.
The Triconex main processors can communicate with the so-called TriStation 1131 application software to download, update and/or monitor programs. These programs are either written in:
- Function Block Diagram language,
- Ladder diagram language, or
- Structured text (Pascal like) Language.
- Cause and Effect Matrix Programmable Language (CEMPLE).
Besides, a Sequence of Events (SOE) recorder software and Diagnostic monitor software are implemented.
References and notes
- Safety Considerations Guide for Tricon v9 Systems, © 2004 Invensys Systems, Document No. 9720097-001
- Technical Product Guide Tricon Systems, © 2006–2007 by Invensys Systems, Inc.
- Developer’s Guide-TriStation 1131, Version 4.1© 2004 Invensys Systems, Document No. 9720100-001