Technical Specifications

FAQ

1. What are the GE IS210DTAIH1A and IS200DTAIH1A?

The IS210DTAIH1A and IS200DTAIH1A are DTAI-series Simplex analog I/O terminal boards used within GE Mark VI turbine control systems. Their primary purpose is to provide termination and interface points for analog field signals. The board allows transmitters, sensors, and other analog devices to be connected to the Mark VI control system while providing the necessary interface to the VAIC processor board. The DTAI board provides 10 analog input channels and 2 analog output channels, making it suitable for applications where multiple process variables need to be acquired and controlled. Because it is designed for a Simplex architecture, the system configuration should be verified before replacement or expansion.

2. How many analog inputs and outputs does the DTAI board provide?

The DTAI board provides 10 analog inputs and 2 analog outputs. The analog inputs can accommodate different field transmitter configurations, including two-wire, three-wire, four-wire, and externally powered transmitters. The board also supports DC voltage input signals such as ±5 V DC and ±10 V DC. The standard analog output range is 0–20 mA, with one output capable of being configured for a different current range through the appropriate jumper arrangement. The actual channel assignment depends on the Mark VI system design, so technicians should always verify individual terminal functions using the applicable system wiring documentation.

3. How does the IS210DTAIH1A connect to the VAIC processor board?

The DTAI terminal board connects to the VAIC processor board through a single 37-pin cable. Field analog signals are first terminated at the DTAI board and then transferred through the interface cable to the VAIC processor for further processing by the control system. This arrangement simplifies field wiring and separates the field termination function from the processor hardware. When troubleshooting an analog signal problem, both the DTAI board and the 37-pin cable should be inspected. A loose connector, damaged cable, or poor contact can interrupt otherwise healthy field signals before they reach the VAIC processor.

4. What types of transmitters can be connected to the IS210DTAIH1A?

The IS210DTAIH1A supports several common transmitter wiring configurations, including two-wire, three-wire, four-wire, and externally powered transmitters. It also supports specified DC voltage input signals, including ±5 V DC and ±10 V DC. The correct wiring method depends on the transmitter type and the specific channel configuration of the Mark VI system. Before connecting a field device, technicians should verify the transmitter’s electrical characteristics, supply requirements, polarity, and corresponding DTAI terminal assignment. Incorrect wiring can cause inaccurate readings, loss of signal, or abnormal current flow in the input circuit.

5. How should a missing analog input signal on the DTAI board be troubleshot?

Begin by confirming that the field transmitter is operating correctly and producing the expected output. Measure the actual field signal with an appropriate test instrument, then inspect the cable between the transmitter and the DTAI terminal board. Check terminal tightness, wiring polarity, cable continuity, and any external power supply associated with the transmitter. If the expected signal is present at the DTAI terminals, inspect the board configuration, jumpers, and 37-pin connection to the VAIC processor. If the signal is correct at the terminal board but incorrect or missing in the Mark VI system, review the VAIC processor and system diagnostics. Checking the signal path one section at a time is generally the most effective method for isolating the fault.

6. What is the purpose of the jumpers on the IS210DTAIH1A?

The DTAI board contains multiple jumpers that provide hardware configuration options for different analog input and output circuits. Certain jumper settings are associated with the electrical configuration of individual channels and field transmitter arrangements, while output configuration can also be adjusted through the appropriate jumper positions. Because these settings directly affect signal behavior, they must be configured according to the Mark VI system design and applicable wiring documentation. An incorrect jumper position can cause an incorrect input range, abnormal output current, or inaccurate process-variable readings. When replacing a board, the jumper configuration should therefore be compared carefully with the original board before the system is returned to service.

7. Can the IS210DTAIH1A be used in a redundant control architecture?

The IS210DTAIH1A is designed as a Simplex analog I/O terminal board rather than as a dedicated terminal board for a TMR architecture. Its primary purpose is to provide compact analog signal interfacing within the applicable Mark VI configuration. Where additional analog channels are required, two DTAI boards can be connected to a VAIC processor arrangement to provide up to 20 analog inputs and 4 analog outputs. However, adding multiple DTAI boards does not by itself create a complete triple-modular-redundant control architecture. Applications requiring TMR functionality should use the appropriate Mark VI hardware specifically designed for redundant operation.

8. What should be considered when replacing an IS210DTAIH1A or IS200DTAIH1A?

Before replacement, verify the complete board model, hardware revision, and the configuration of the existing Mark VI system. Confirm whether the installed board is identified as IS210DTAIH1A or IS200DTAIH1A and ensure that the replacement is electrically and functionally compatible. Before removing the board, place the control system in the required maintenance state and follow the site’s electrical isolation procedures. Clearly label all analog field wiring, ground connections, jumper positions, and the 37-pin processor cable before disconnecting them. After installation, verify the 48 terminal connections, SCOM grounding, jumper settings, and processor cable. Once the system is safely powered, check each affected analog input and output and review the Mark VI diagnostic information. Important turbine control signals should be functionally tested before the equipment is returned to normal operation.