IS200TBCIH4C - Contact Input with Group Isolation Terminal Board

IS200TBCIH4C - Contact Input with Group Isolation Terminal Board IS200TBCIH4C - Contact Input with Group Isolation Terminal Board

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Part Number: IS200TBCIH4C
Manufacturer: General Electric
Series: Mark VI
Product Type: Contact Input w/ Group Isolation Terminal Board
Input filter: Hardware filter, 4 ms
Power consumption: 20.6 watts on the terminal board
Temperature rating: 0 to 60 oC
Size: 33.02 cm high x 10.16 cm wide
Temperature Operating: -30 to 65oC
Number of channels 24
Repair: 3-7 Day
Availability: In Stock
Country of Manufacturer: United States

Functional Description

IS200TBCIH4C is a Contact Input with a Group Isolation Terminal Board developed by General Electrics.The contact input terminal board is purpose-built to accommodate a substantial quantity of 24 dry contact inputs. These inputs are skillfully integrated into the system, meticulously wired to two barrier type terminal blocks for streamlined connectivity. To facilitate the functionality of these contact inputs, a direct current (DC) power supply is thoughtfully routed into the TBCI. This power supply serves the essential role of providing the necessary contact excitation, enabling the effective operation of the contact inputs.


  • Ensuring robust performance in various operational environments, the contact inputs are fortified with specialized noise suppression circuitry. This circuitry acts as a vigilant guardian against potential disruptions arising from surges and high-frequency noise. Such disturbances, which might otherwise compromise the integrity of the contact inputs, are diligently filtered and mitigated through the noise suppression circuitry. As a result, the TBCI stands equipped to withstand and repel external factors that could potentially hinder the accuracy and reliability of the input signals.
  • The TBCI exemplifies an intricate solution designed to seamlessly integrate and manage a significant count of 24 dry contact inputs. Through the incorporation of barrier type terminal blocks, DC power supply provisions, and adept noise suppression circuitry, it ensures the contact inputs' smooth operation while safeguarding them from external interference, thus fostering a dependable and robust interface within the larger system framework.


  • The configuration of the system involves the integration of 24 dry contact inputs, meticulously interconnected through a direct wiring process. These inputs are seamlessly routed to two distinct I/O terminal blocks that are securely affixed to the terminal board. The terminal board's functionality is further enhanced by these terminal blocks, facilitating the efficient management of input connections.
  • Each of these I/O terminal blocks is firmly anchored in place through the utilization of two screws. This mechanical arrangement not only ensures a secure attachment but also grants the convenience of detachment when required for maintenance activities. This design consideration enhances the overall serviceability of the terminal board, permitting easy access to the terminal blocks for inspection, repair, or replacement as necessary.
  • Within the context of wiring, each of the terminal blocks is generously equipped with a total of 24 terminals. These terminals are meticulously designed to accommodate wires as substantial as #12 AWG, offering a wide range of compatibility to cater to diverse wiring needs. This design aspect facilitates the seamless integration of different wire gauges, thus catering to a variety of application-specific requirements.
  • In order to maintain a robust grounding configuration, a shield terminal strip is thoughtfully positioned adjacent to each of the terminal blocks. These shield terminal strips are intentionally linked to the chassis ground, reinforcing the system's integrity against electromagnetic interference and other potential disturbances. This strategic placement ensures that grounding is efficiently managed and that any extraneous electrical noise is effectively diverted away from the sensitive components connected to the terminal blocks.


  • Near the entry point of each signal, filters are implemented to effectively diminish high-frequency noise and suppress surge effects. For H1's dry contact inputs, their operation hinges on a floating 125 V DC (ranging between 100-145 V DC) supply sourced from the turbine control system. Prior to reaching each contact input, the 125 V DC bus undergoes current limitation within the power distribution module.
  • For the H2 and H3 variants, lower voltages are employed as outlined in the provided specification table. The discrete input voltage signals progress onward to the I/O processor, which then channels them through optical isolators. These isolators play a dual role: they establish group isolation, effectively segregating different signal groups, and subsequently transmit the refined signals to the overarching system controller.
  • The isolation circuitry employs a reference voltage to establish a transition threshold that precisely aligns with 50% of the floating power supply voltage applied. Notably, the tracking mechanism is configured to ensure that it doesn't drop below 13% of the nominal rated supply voltage. This strategic clamping serves the purpose of compelling all contacts to signify an open state whenever the voltage experiences a dip below this specified threshold.

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What is IS200TBCIH4C?
It is a Contact Input with a Group Isolation Terminal Board developed by General Electrics.

What is the purpose of monitoring the excitation voltage?
Monitoring the excitation voltage ensures that the power supply remains within acceptable levels for proper operation. It prevents potential issues caused by inadequate excitation voltage.

What action is taken if the excitation voltage drops below 40% of the nominal voltage?
If the excitation voltage falls below 40 percent of the nominal value, a diagnostic alarm is triggered and latched by the I/O pack. This alarm alerts operators to the voltage drop issue.

How are the inputs associated with the terminal board affected during a test?
As part of a test, all inputs linked to the specific terminal board are forced into the open contact state, ensuring a fail-safe configuration during testing or troubleshooting.