Part No.: IS230TBAIH4C
Manufacturer: General Electric
Product Type: TMR Analog I/O Assembly
Input span, transmitters: 1-5 V dc from 4-20 mA current input
Outputs: 24 V outputs provide 21 mA each connection
Size: 10.16 cm wide x 33.02 cm high
Number of channels: 12
Availability: In Stock
Country of Manufacture: United States (USA)
Series: Mark VIe
IS230TBAIH4C is an TMR Analog I/O Assembly developed by GE. It is a part of Mark VIe control system. The Terminal Board for Analog Inputs (TBAI) provides convenient and versatile connectivity options for integrating analog input signals from the field devices to the I/O processors in various control systems. The TBAI features three DC-37 pin connectors that facilitate these connections. In TMR applications, the input signals are distributed to the three connectors (R, S, and T) on the TBAI. This triplex arrangement ensures that the I/O processors receive redundant input signals from multiple sources, enhancing the system's fault tolerance and reliability.
- Simplex Configuration: For straightforward applications, the analog inputs can be connected using a single connector (JR1). This setup is ideal when redundancy or fault tolerance is not a critical requirement.
- TMR Configuration: For applications that demand high reliability and redundancy, the TMR (Triple Modular Redundancy) configuration is employed. This involves using all three connectors, namely R, S, and T, for connecting to the R, S, and T control channels in the I/O processors.
- Cable or Direct Connection: Allows flexibility in how the connections are made. Analog inputs can be connected through cables, which offers ease of installation and maintenance. Alternatively, for applications where direct and short connections are feasible, the analog inputs can be directly linked to the electronics.
- TMR Output Operation: The TMR outputs work in a synchronized manner to achieve redundancy. The output drivers on each connector (R, S, and T) combine their individual current outputs to create a total current output.
- Measuring Shunt for TMR Output: To determine the total current output accurately, a measuring shunt is integrated. This shunt provides a reference signal for measuring the combined current generated by the three connected output drivers.
- In a TMR (Triple Modular Redundancy) system, redundancy and fault tolerance are paramount to ensure high reliability and safety. In such a system, the analog inputs fan out to three independent I/O controllers, typically VAIC (Voter Analog Input Controller) or PAIC (Programmable Analog Input Controller). These controllers serve as redundant channels for processing and voting the analog input signals.
- To power the transducers that provide the analog input signals, each of the three I/O controllers supplies a 24 V dc power. To achieve redundancy and ensure a stable power source, the 24 V dc power is diode shared on the terminal board. This diode sharing configuration ensures that even if one of the I/O controllers fails, the power supply to the transducers remains intact through the other two controllers.
- The analog current output from each I/O controller is fed into the terminal board and combined with currents from the other two controllers. The terminal board serves as a central point for gathering the three redundant analog output signals.
- To determine the actual output current accurately, a series resistor is incorporated into the circuit. Each output current passes through this resistor, generating a voltage drop proportional to the current flowing through it. This voltage is then fed back to each I/O controller.
- Each I/O controller receives the three voltage signals corresponding to the three output currents. To achieve a voted or redundant output, the I/O controllers implement a voting algorithm. This algorithm calculates the median value of the three currents, also known as the voted middle value. The median value is chosen to ensure robustness against outliers or transient faults that might affect one of the I/O controllers. By selecting the median value, the TMR system ensures a reliable and accurate output current even in the presence of potential failures in one of the redundant channels.
- The voted middle value output, determined by the voting algorithm, is then used for further processing or control actions within the TMR system. The redundancy provided by the TMR architecture ensures that the control system maintains stable and accurate operation, even in challenging and safety-critical environments. The TMR approach is widely used in various industries where high reliability and fault tolerance are essential requirements.
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Frequently Asked Questions
What is IS230TBAIH4C?
It is an TMR Analog I/O Assembly developed by GE
Can I integrate various types of sensors and transmitters into the terminal board's analog inputs?
Yes, The terminal board's flexibility allows seamless integration of various types of sensors and transmitters. Whether it's voltage inputs, externally powered transmitters, or different configurations of two, three, or four-wire transmitters, the board can handle diverse measurement needs.
Can I use the terminal board in safety-critical applications?
The terminal board's reliability, TMR support, and noise suppression capabilities make it suitable for safety-critical applications where accurate and redundant measurements are essential.
What is the measuring shunt, and how does it work?
The measuring shunt is a critical component in TMR applications. It helps determine the total current output generated by the three connected output drivers. By measuring this combined current accurately, the terminal board ensures precise control and redundancy in the analog output signals, enhancing system reliability.