Technical Specifications

FAQ

1. What is the main function of the GE IS200TBAIH1BBB Analog Input Terminal Board?
The IS200TBAIH1BBB is used as an analog signal termination and interface board in the GE Mark VI control system. It provides the field wiring interface for analog transmitters and routes the collected signals to the associated I/O processing electronics. Typical applications include pressure, temperature, flow, level, and other process measurements used by turbine control systems. The board is designed to handle the practical wiring and signal-distribution requirements between field instruments and the Mark VI control architecture.

2. How many analog input and output channels does the IS200TBAIH1BBB support?
The TBAI board provides 10 analog input channels and 2 analog output channels. The input channels can accommodate different transmitter wiring arrangements, including two-wire, three-wire, four-wire, and externally powered transmitters. The two output channels provide analog control signals to external devices. The exact signal configuration should be matched with the associated VAIC I/O board and the control-system application.

3. What types of transmitters can be connected to the IS200TBAIH1BBB?
The board is designed to support a wide range of industrial transmitters. Two-wire transmitters, three-wire transmitters, four-wire transmitters, and externally powered transmitters can be connected when the corresponding Mark VI configuration is used. Voltage and current input arrangements can also be selected through the board’s configuration jumpers. This allows the same terminal-board design to be used with different types of field instrumentation without requiring a completely different termination assembly.

4. Can the IS200TBAIH1BBB be used in a TMR control system?
Yes. The TBAI architecture supports both Simplex and TMR applications. In a TMR configuration, the analog input signals can be distributed to the R, S, and T control channels through the JR1, JS1, and JT1 connections. This arrangement allows the redundant control channels to receive corresponding field measurements and supports the fault-tolerant architecture used by critical turbine control systems. Correct configuration of the associated I/O processors and wiring is essential when installing the board in a TMR system.

5. What are the three DC-37 connectors on the IS200TBAIH1BBB used for?
The three DC-37 connectors provide the interface between the TBAI terminal board and the Mark VI I/O processing electronics. They are identified as JR1, JS1, and JT1 and are particularly important in TMR installations, where separate control channels need access to the corresponding analog signals. In a Simplex installation, the appropriate connector is used according to the system configuration. The connectors should be inspected carefully during maintenance because poor contact, damaged pins, or incorrect cable installation can result in multiple channel communication or signal problems.

6. How should an abnormal analog input signal on the IS200TBAIH1BBB be diagnosed?
Troubleshooting should begin at the field instrument rather than immediately replacing the terminal board. First verify the transmitter power supply and confirm that the transmitter is producing the expected current or voltage. Then check the polarity, terminal connections, shield connections, and field wiring. If the field signal is correct, inspect the DC-37 connection between the TBAI board and the I/O processor. The associated VAIC board and system configuration should also be checked. Comparing the affected channel with a known-good channel can help determine whether the problem originates from the transmitter, wiring, terminal board, I/O electronics, or software configuration.

7. Does the IS200TBAIH1BBB provide protection against electrical noise?
Yes. The TBAI design incorporates signal-conditioning and noise-suppression circuitry intended to reduce the effects of surge and high-frequency electrical noise on analog signals. This is important in turbine and industrial control cabinets where motors, generators, drives, contactors, and other high-power equipment can introduce electrical interference. Proper field wiring remains important, however. Shielding, grounding, cable routing, and separation from high-voltage conductors should follow the installation requirements of the overall Mark VI control system.

8. What should be checked when replacing an IS200TBAIH1BBB in an existing Mark VI system?
Before replacement, verify the complete board part number and revision and record the existing jumper configuration and field wiring. The replacement board should be installed with the same signal configuration unless the system engineering documentation specifies a change. Check the two terminal blocks, field wiring, shields, and the JR1/JS1/JT1 connectors for loose or damaged connections. After installation, verify transmitter power, analog input readings, output operation, and system diagnostic status. In a TMR application, all three control paths should be checked to ensure that the redundant channels are receiving consistent signals and that no new diagnostic or hardware mismatch alarms have appeared.