IS230TDBTH4A - TMR Contact Input Assembly

IS230TDBTH4A - TMR Contact Input Assembly IS230TDBTH4A - TMR Contact Input Assembly

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Part Number: IS230TDBTH4A
Manufacturer: General Electric
Series: Mark VIe
Technology: Surface-mount
Max response time on: 25 ms typical
Max response time off: 25 ms typical
Contact material: Silver cad-oxide
Function: TMR Contact Input Assembly
Availability: In Stock
Country of Manufacture: United States (USA)

Functional Description

IS230TDBTH4A is a TMR Contact Input Assembly manufactured and designed by General Electric. It is a part of the Mark VIe Control System. It is a reliable TMR (Triple Modular Redundancy) contact input/output terminal board specifically designed for DIN-rail mounting. This versatile board is designed to cater to various industrial and control applications, providing a robust and efficient solution for contact input and output functions. It is capable of accepting 24 group isolated contact inputs. Each input is thoughtfully isolated from the others, preventing any interference or cross-talk that could compromise the accuracy of data readings. These inputs are supplied with a nominal 24, 48, or 125 V DC wetting voltage from an external source, offering flexibility in voltage options to suit different power supply configurations.


  • To ensure reliable and stable operation, the contact inputs on the TDBT board are equipped with noise suppression circuitry. This circuitry effectively filters out surge events and high-frequency noise that may occur in industrial environments, ensuring that the inputs remain clean and consistent, contributing to the overall reliability and stability of the connected system.
  • The product is designed to provide 12 form-C relay outputs, offering versatile switching capabilities. These relay outputs enable users to control various external devices and processes with precision. Additionally, to further enhance the relay functions, the TDBT board accepts an option card. This option card allows users to expand the relay functions and customize the board to meet specific application requirements, offering a flexible and scalable solution.
  • In Mark VIe systems, the board works seamlessly with the PDIO (Programmable Digital Input Output) I/O pack. The PDIO I/O pack plugs into D-type connectors on the TDBT board and communicates with the controllers over Ethernet. For systems with dual controllers, three connection points for PDIO are provided on the TDBT board: connector JR1 is networked to the R controller, JS1 PDIO to the S controller, and JT1 PDIO to both R and S controllers. This redundant configuration ensures the reliability and fault tolerance of the control system.
  • For TMR controllers, one network connection is provided to each PDIO, leading to the respective controller. This setup ensures that each controller receives the required input and maintains the necessary redundancy for fault tolerance.
  • It is important to note that the board is not designed to operate correctly with a single PDIO I/O pack. The use of TMR controllers and the redundancy provided by multiple PDIO packs are essential for the component to function as intended and maintain the high level of reliability required in critical control applications.


  • The board, in combination with a plastic insulator, is ingeniously designed for secure mounting on a sheet metal carrier. This sheet metal carrier is then conveniently mounted on a DIN rail, providing a standardized and space-saving solution for industrial control systems. Additionally, the TDBT board and insulator can optionally be mounted on a sheet metal assembly, which can be securely bolted inside a cabinet. This versatility in mounting options allows users to choose the most suitable configuration based on their specific installation requirements and available space.
  • The connections are expertly wired directly to two sets of 48 terminal blocks, utilizing typically #18 AWG wires. These terminal blocks serve as reliable and organized connection points for external devices and equipment, allowing for efficient integration of the TDBT board into the control system. The upper set of terminals, referred to as TB1, is dedicated to connecting to the relay portion of the board, enabling control over various external processes and devices. On the other hand, the lower set of terminals, TB2, facilitates the connection to the contact input circuits, allowing for the monitoring and processing of different contact inputs.
  • To ensure consistency and ease of use, the screw assignments for the two sets of terminals, TB1 and TB2, are thoughtfully designed to be identical to those found on the SRLY relay board and the STCI contact input terminal board. This standardization simplifies the wiring process and ensures a uniform and familiar experience for users, reducing the risk of wiring errors and streamlining the integration into existing systems.
  • To enhance signal integrity and minimize electromagnetic interference, shields from the shielded cables are appropriately terminated on a separate bracket. This thoughtful design provides a secure grounding path for the shields, helping to maintain optimal noise immunity and ensuring accurate data transmission and control signals.

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What is IS230TDBTH4A?
It is a TMR Contact Input Assembly manufactured and designed by General Electric

How does the board provide diagnostic feedback to the PDIO packs?
The terminal board is designed to provide diagnostic feedback to the PDIO packs. It achieves this by monitoring an isolated set of contacts on each relay. By doing so, the TDBT board can indicate the state of each relay to the PDIO packs, offering essential diagnostic information about the status and operation of the relay outputs.

What is position feedback, and how is it utilized in the terminal board?
Position feedback is a feature in the board that distributes relay status information to all three PDIO packs. This ensures that each PDIO pack is aware of the position or state of the relays on the TDBT board. This redundancy helps enhance system reliability and fault tolerance, allowing for effective and synchronized control across multiple PDIO packs.

How does the module utilize isolated voltage feedback with WROB?
When used in conjunction with WROB (Wide Range Output Boards), the TDBT board employs isolated voltage feedback to detect the status of the six fuse pairs present on the board. This isolated voltage feedback allows the board to determine the operational status of the fuses accurately. Any deviations or abnormalities in the fuse status can trigger diagnostic alarms or alerts, ensuring timely maintenance and ensuring the integrity of the system.