IS230TTCSH3B - TMR Module

SPECIFICATIONS

Part Number: IS230TTCSH3B
Manufacturer: General Electric
Series: Mark VIe
Function: TMR Module
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS230TTCSH3B is a TMR Module manufactured by General Electric. It is a part of Mark VIe control system. In a redundant system configuration, such as a Triple Modular Redundant (TMR) system, or a dual system or single system, the controllers play specific roles and interact through dedicated I/O networks (IONets). In a TMR (Triple Modular Redundant) control system, the configuration is typically set to operate with a two-out-of-three selection, maximizing running and tripping reliability. However, for even higher tripping reliability, additional dedicated tripping controls can be implemented. It is crucial that these tripping controls also follow TMR principles to ensure the preservation of running reliability.

TMR System Configuration

• In a TMR system, there are three controllers designated as R, S, and T.
• Each controller is responsible for its own I/O network (IONet), namely the R IONet, S IONet, and T IONet.
• During normal operation, each controller receives inputs from the I/O modules across all IONets.
• The controllers have the option to perform voting on the inputs, comparing and selecting the most reliable readings if redundancy is employed.
• The controllers then process the application algorithms, which may involve additional computations or sensor selection if voting is not performed.
• After the algorithm processing, each controller sends its respective outputs to the I/O modules on its own network.
• Finally, the controllers exchange data with each other for synchronization, ensuring consistent and coordinated operation across the system.

SYstem features

• The Mark VIe control architecture in a TMR configuration offers superior reliability and availability compared to a dual controller setup. This is due to its enhanced fault detection capabilities. In addition to the features found in a dual redundant system, the TMR controller provides three independent outputs to all TMR I/O modules. The state variables between controllers are voted, meaning that they are compared and selected rather than simply combined.
• In a TMR Mark VIe control system, all three controllers receive inputs from the I/O modules across all networks and continuously transmit outputs on their respective IONets. If a controller or network component fails, the system does not require fault detection or failover time to continue operating. Each controller transmits its copy of the state variables after the output packet has been transmitted. During the next run cycle, each controller takes the three sets of state variables and performs a voting process to determine the final values to be used.
• This redundancy and voting mechanism in a TMR Mark VIe control system significantly improves fault detection and ensures that the system can continue functioning reliably even in the presence of failures or faults. The continuous transmission of outputs and voting of state variables contribute to the system's high reliability and availability, making it suitable for critical control applications.

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FREQUENTLY ASKED QUESTIONS

What is IS230TTCSH3B?
It is a TMR Module manufactured and designed by General Electric

How do the controllers in a TMR system configuration operate?
In a system, there are three controllers designated as R, S, and T. Each controller is responsible for its own dedicated I/O network (IONet), namely the R IONet, S IONet, and T IONet. During normal operation, all three controllers receive inputs from the I/O modules across all IONets.

What is the purpose of the two-out-of-three selection in a system?
The two-out-of-three selection is a configuration setting commonly used in TMR systems. It maximizes running and tripping reliability by requiring at least two out of the three controllers to agree on a decision. This redundancy helps ensure that reliable and accurate control actions are taken.

Can additional tripping controls be implemented in a TMR system for increased reliability?
Yes, additional dedicated tripping controls can be implemented to further enhance tripping reliability. It is important that these tripping controls also follow TMR principles to maintain the overall running reliability of the system.