IS200TBQGH1A - Terminal Board

IS200TBQGH1A - Terminal Board IS200TBQGH1A - Terminal Board

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Part Number: IS200TBQGH1A
Manufacturer: General Electric
Series: Mark VIe
Function: Terminal Board
Connectors: 60
Jumpers: J1-J4
Vertical pins: JUUR, JUUS, and JUUT
MOV: MV29 - MV36
Description: Interface Terminal Board
Terminal Strip: Features two levels of screw connectors
Manual: GEH-6721
Product Type: PCB
Availability: In Stock
Country of Manufacturer: United States (USA)


IS200TBQGH1A is a terminal board manufactured by General Electric. It is a part of Mark VIe Series used in GE Speedtronic Gas Turbine Control Systems. Mark VIe is a versatile control system for a variety of applications. It supports simplex, dual, and triple redundant systems with high-speed networked I/O. For I/O, controllers, and supervisory interface to operator and maintenance stations, as well as third-party systems, industry-standard Ethernet communications are used. ToolboxST is a common software platform for programming, configuring I/O, trending, and analyzing diagnostics for Mark VIe and related controls. At the controller and plant levels, it provides a single source of high-quality, time-coherent data for effective asset management.


Interface Terminal Board

It serves as an interface for specialized turbine I/O application boards. It provides a connection point and facilitates the exchange of signals and data between the turbine I/O application boards and other system components. It acts as a central hub for managing input and output connections.

Box-Style Design

The board has a box-style design, indicating that it is a compact, self-contained unit. It is not removable, meaning it is permanently fixed in place once installed in the system.

Terminal Strip

The surface features a terminal strip with two levels of screw connectors. This strip provides the connection points for wiring the various components to the board. The terminal strip contains a total of sixty connectors, each serving as a terminal point for attaching wires. However, pins 53-60 are marked as unused and internally grounded, meaning they are not intended for external connections.

Box Resistors

Includes two box resistors, which are electronic components that provide resistance to regulate current flow or dissipate excess power. These resistors likely serve specific functions within the system, such as voltage regulation or current limiting.

Jumper Switches

Four jumper switches, labeled J1 through J4, are present on the board. Jumper switches are small devices that can be manually toggled to establish or interrupt electrical connections. The purpose of these jumper switches may vary based on the specific application or configuration requirements of the system.

Metal Oxide Varistors (MOVs)

Near the connectors on the board, there are two lines of Metal Oxide Varistors (MOVs). MOVs are electrical components that protect against voltage surges or transients by rapidly diverting excessive voltage to the ground. Their presence on the board indicates a safeguard against potential electrical disturbances that could impact the connected components.

Importance of Manuals and User Guides

To ensure proper installation, operation, and maintenance of the terminal board, it is crucial to consult the relevant General Electric manuals and user guides. These documents contain essential information, including instructions, warnings, and handling procedures specific to the board. Reading and following these guidelines help ensure safe and correct usage of the board while maximizing its performance and longevity.

Product Attributes

  • Compatibility: It is a part of the Mark VIe Series, which is used in GE Speedtronic Gas Turbine Control Systems. It is compatible with other components of the system and can be easily integrated into the control system.
  • Safety and usability: The board comes with detailed manuals and user guides that provide vital information about the installation and operation of the component. The manuals also contain warnings and handling procedures that should be followed before beginning any type of maintenance or installation.
  • Reliability: The board is designed to withstand harsh industrial environments and can operate reliably in extreme temperatures and humidity levels.

Fault Detection

  • Robust Local Processing: Each input and output pack within the Mark VIe system is equipped with robust local processing capabilities. This allows the packs to perform function-specific fault detection methods, verifying their proper operation and detecting potential faults.
  • Analog to Digital (A/D) Converters: Analog to digital converters play a crucial role in the fault detection process. During each conversion cycle, the A/D converters compare the converted calibration input signal to a reference standard. If the converted signal falls outside the acceptable range, the pack declares its health as bad. This comparison helps identify any discrepancies or abnormalities in the analog input signals, indicating potential faults.
  • Analog Signal Output: For the output terminal board, a small current-sense resistor is utilized to detect 4-20 mA signals. This signal is read back and compared to the commanded value using a separate A/D converter. If the difference between the commanded and actual values exceeds an acceptable level, the output signal is flagged as unhealthy. This method ensures accurate monitoring of analog output signals and detects deviations from the desired values.
  • Discrete Input Opto-isolators: Discrete input opto-isolators are employed in the fault detection process. These opto-isolators are periodically turned on and off, independent of the actual input signal. This rapid switching does not interfere with the time capture of the sequence of events (SOE). If a signal path becomes stuck and does not respond to the test command, indicating a potential fault, the signal is declared to be in "poor health." This mechanism helps identify non-responsive or malfunctioning discrete input signals.
  • By utilizing these fault detection methods and components, the I/O packs in the Mark VIe systems ensure that proper operation is confirmed and faults are promptly detected. This proactive approach to fault detection enhances system reliability, reduces downtime, and supports effective troubleshooting and maintenance procedures.

System Communication Loss

System communication loss within the context of the IONet and output packs of the Mark VIe control system involves the following expanded details:

  • Communication Monitoring: Each output pack within the system actively monitors the IONet for valid commands coming from one or two controllers. This monitoring ensures that the output pack receives the necessary instructions to perform its intended actions.
  • Communication Failure Detection: If an output pack does not receive a valid command within the expected time frame, it declares that communication has been lost. This indicates a breakdown in the communication link between the controllers and the output pack.
  • Configurable Pack Action: In the event of a communication failure, the action taken by the output pack is configurable. The system provides options for determining how the output pack responds in such situations.
  • Holding Last Commanded Value: One option is for the output pack to hold the last commanded value indefinitely. This means that if communication is lost, the output pack will continue to maintain the output at the value it was last instructed to be.
  • Specific Output State: Another option is to configure the output pack to go to a specific output state in the event of a communication failure. This allows for predefined actions to be taken if communication is lost, ensuring that the output transitions to a known state.
  • Power Down (Default Action): The default action, particularly for critical loops, is to power down the output pack. This means that in the event of a communication failure, the output pack behaves as if the power supply has been removed. This action helps to ensure safety and prevent any unintended or undesired operation in critical control loops.
  • Alternate Output for Non-Critical Loops: In non-critical loops where the loss of communication may not pose immediate safety or operational risks, an option is provided to choose an alternate output value or state. This option aims to improve the overall reliability and performance of the system during communication failures.

By offering configurable actions in the event of communication loss, the Mark VIe control system provides flexibility to handle various scenarios based on the criticality of the loop. Critical loops default to a power-down action for safety, while non-critical loops can be configured to select alternate outputs that enhance system reliability.

Operating Environment

The operating environment for the Mark VIe control system cabinet requires certain considerations to ensure proper installation and functionality. Here are the expanded details:

  • Installation Location: The control system cabinet should be placed in an environmentally controlled room or within the control room itself. This ensures that the temperature and humidity are within acceptable limits for the reliable operation of the control system.
  • Mounting Surface: The cabinet should be installed on a floor surface that allows attachment in only one plane. It should be a flat, level, and continuous surface to provide stability and proper alignment.
  • Mounting Hardware: The customer is responsible for providing the necessary mounting hardware to secure the cabinet in place. The specific hardware requirements will depend on the installation location and conditions.
  • Lifting and Handling: The cabinet is equipped with lifting lugs to facilitate installation or relocation. If lifting cables are used, they should not exceed a 45° angle from the vertical plane to ensure safe lifting and proper weight distribution.
  • Cabinet Security: The cabinet is designed with a door handle that can be locked for security purposes. This helps to prevent unauthorized access to the control system and protects the sensitive equipment housed within.
  • Cable Entry: Interconnecting cables can enter the cabinet from either the top or bottom via removable access plates. These plates provide a convenient and accessible way to route the cables into the cabinet.
  • Convection Cooling: The cabinet relies on convection cooling to maintain optimal operating temperatures for the internal components. To ensure efficient cooling, conduits used for cable entry must be properly sealed to the access plates. This prevents air leakage and ensures that the cooling airflow within the cabinet is effectively directed.
  • Temperature Considerations: The air passing through the conduits and entering the cabinet via the access plates must be within the specified temperature range. This requirement applies to both the top and bottom access plates to maintain proper thermal conditions within the control system cabinet.

IO network (IONet)

  • The IO network (IONet) is a specialized communication protocol used in industrial control systems, specifically in the context of the Mark VIe system. It is designed to facilitate reliable and high-speed data transfer between local or distributed I/O (Input/Output) modules.
  • IONet operates on a point-to-point architecture, meaning it establishes direct connections between individual devices. This allows for efficient and dedicated communication channels between I/O modules, ensuring reliable data transmission. Additionally, IONet operates in full-duplex mode, enabling simultaneous bidirectional communication.
  • The protocol provides a deterministic 100 MB (megabit) communications network, meaning it offers predictable and consistent timing for data exchange. Determinism is crucial in industrial control systems where precise synchronization and coordination of processes are necessary.
  • The GE IONet switches are networking devices specifically designed to support IONet communication. These switches offer robust environmental capability, making them suitable for use in demanding industrial environments. They are engineered to withstand harsh conditions and provide reliable performance.
  • In addition to IONet, the Mark VIe system supports integration with standard network protocols such as Profinet, Profibus, and Foundation Fieldbus. These protocols are widely used in industrial automation and control systems and allow for seamless interoperability with various devices and equipment. By integrating these protocols into the Mark VIe system, users can leverage the benefits of these industry-standard networks while still enjoying the capabilities of the Mark VIe system for control and monitoring purposes.


  • The board boasts an array of 60 connectors, making it suitable for handling numerous input and output connections. These connectors offer a comprehensive range of interface options, enabling the board to interact with a wide variety of devices and subsystems within the Mark VIe system.
  • To enhance flexibility and adaptability, the it features jumpers labeled as J1, J2, J3, and J4. These jumpers enable the configuration of specific connections or the selection of different settings based on the requirements of the application. By adjusting the jumper settings, users can customize the behavior of the terminal board to suit their unique needs.
  • Additionally, the it incorporates vertical pins, labeled as JUUR, JUUS, and JUUT. These pins play a crucial role in providing additional functionality and connectivity options. They serve as important connection points for various signal routing and distribution tasks, further enhancing the board's capacity to handle complex input and output requirements.
  • For enhanced protection against voltage transients and overvoltage events, the module features Metal-Oxide Varistors (MOV) designated as MV29 to MV36. These MOVs act as voltage clamping devices, diverting excess voltage away from sensitive components and preventing potential damage caused by transient voltage spikes.

Terminal Blocks

  • T-type terminal boards are equipped with dual, 24-point barrier-type terminal blocks, which are easily removable. Each of these points is designed to accommodate two 3.0 mm (0.12 in) (12AWG) wires with 300 V insulation per point. These wires can be fitted with either spade or ring-type lugs. Additionally, captive clamps are included for the termination of bare wires. The screw spacing on these boards measures a minimum of 9.53 mm (0.375 in) center-to-center.
  • S-type terminal boards are tailored to support one I/O pack, suitable for both simplex and dual redundant systems. These boards are half the size of T-type boards and are typically mounted on a standard base, although DIN-rail mounting is also an option. Two versions of the S-type boards are available: one version features fixed Euro-style box-type terminal blocks that cannot be removed, while the second version comes with removable box-type terminal blocks. The terminal blocks on S-type boards can accept either one 2.05 mm (0.08 in) (12AWG) wire or two 1.63 mm (0.06 in) (14AWG) wires, each with 300 V insulation per point. The screw spacing for these terminal blocks measures a minimum of 5.08 mm (0.2 in) center-to-center.

Terminal Strip

  • Two Levels of Screw Connectors: The terminal strip features two levels of screw connectors on its surface. This dual-level design allows for efficient and organized wiring connections.
    Having two levels of connectors can be particularly useful when dealing with a large number of connections, as it helps prevent overcrowding and simplifies cable management.
  • Total of Sixty Connectors: The terminal strip boasts a total of sixty connectors, which provide ample connectivity options.
    This generous number of connectors allows for the board to accommodate a wide range of input and output connections, making it versatile for different applications.
  • Unused and Internally Grounded Pins 53-60: Pins 53 to 60 on the terminal strip are notable because they are designated as unused and internally grounded.
    Unused pins indicate that these specific connection points are not currently utilized in the system's configuration.
    Internally grounding these pins means that they are electrically connected to the ground, which is a common reference point in electronic systems. Grounding unused pins can help reduce electromagnetic interference and maintain signal integrity in the surrounding circuits.
  • Versatility and Customization: The presence of a large number of connectors on the terminal strip allows for versatility and customization in connecting various components and devices. Users can configure the board to suit their specific needs, routing signals, power, or data to the appropriate connectors as required by the application.
  • Secure and Reliable Connections: Screw connectors provide a secure and reliable means of making electrical connections. They ensure good contact and can withstand mechanical vibrations and environmental conditions.

WOC has a large stock of GE Speedtronic Gas Turbine Control System Replacement Parts. Our team of experts at WOC is happy to assist you with any of your GE automation requirements. For pricing and availability on any parts and repairs contact us.


What is IS200TBQGH1A?
It is a Terminal Board manufactured by General Electric.

What is the function of the MOVs on the component?
The MOVs (metal oxide varistors) are used to protect the terminal board and the connected devices from voltage surges.

How many connectors are on the terminal strip of the board?
The terminal strip has sixty connectors in total.

What are JUUR, JUUT, and JUUS on the board?
JUUR, JUUT, and JUUS are three male vertical pin connectors located one above the other on the right quadrant of the board.

What are MV29 through MV36 and MV1 through MV24?
MV29 through MV36 and MV1 through MV24 are metal oxide varistors (MOVs).

What is the purpose of the ferrite chokes on the board?
Ferrite chokes are passive electronic components used to suppress high-frequency electromagnetic interference (EMI) in electronic circuits.

What wire sizes are supported by the T-type terminal board?
Each of the terminal points on a T-type board is designed to accommodate two 3.0 mm (0.12 in) (12AWG) wires with 300 V insulation per point. This flexibility allows for the use of various wire sizes and types.

Can I use spade or ring-type lugs with the T-type terminal board?
Absolutely, the T-type terminal board is compatible with spade or ring-type lugs, providing versatility in connection options.

What about bare wires? Can they be terminated on T-type boards?
Yes, T-type boards include captive clamps specifically for the termination of bare wires, ensuring secure and reliable connections.