GE DS200TCDAH1BHF Digital Input Output Board

The DS200TCDAH1BHF is a Digital Input/Output Board (TCDA) manufactured by GE Energy as part of the Mark VI™ turbine control system. This board is located in the digital I/O cores (designated as <Q11>, <Q51>, and optionally <Q21>) and serves as a critical interface for processing digital contact input signals from the DTBA and DTBB terminal boards, as well as contact output (relay/solenoid) signals from the two TCRA boards. The DS200TCDAH1BHF communicates over the IONet to the TCQC board in the <R1>/<R2> core (if <Q21> is installed) and to the CTBA terminal board in the <R5> core.

The DS200TCDAH1BHF is a high‑reliability board designed for harsh industrial environments. It conditions digital input signals, time‑tags changes of state, and transmits them via the IONet. It also writes contact output commands to the TCRA boards to control external relays and solenoids. The board includes hardware jumpers for IONet termination, IONet ID assignment, and stall timer enable, as well as software‑configurable input inversion. This board is essential for turbine control applications requiring fast, deterministic digital I/O with time‑stamped event logging. The suffix BHF indicates a specific revision and factory configuration (including coating and component variations) that maintains full backward compatibility with all Mark VI systems.

Functional Description

The DS200TCDAH1BHF performs two primary functions:

• Contact input processing – It receives digital contact input signals from the DTBA and DTBB terminal boards via the JQ and JR connectors. The onboard circuitry conditions these signals, applies debounce filtering, and time‑tags any change of state (transition from open to closed or vice versa). The processed signals are then placed onto the IONet through the JX1 or JX2 connector for use by the control system (e.g., TCQC or CTBA boards).

• Contact output control – It receives contact output commands (for relays or solenoids) from the control system via the IONet. These commands are written to the TCRA boards (located in core positions four and five) through the JO1 and JO2 connectors. The TCRA boards then drive the actual relay or solenoid coils.

The board is powered by the TCPS power supply board in the <R1>, <R2>, or <R5> cores via the JP connector, which distributes power to the DS200TCDAH1BHF in the respective digital I/O cores.

The DS200TCDAH1BHF is field‑configurable through eight hardware jumpers (J1 through J8) and software constants entered via the I/O Configuration Editor on the operator interface (HMI). Jumper settings control IONET termination, IONET node ID, and stall timer enable. Software configuration allows inversion of any contact input signal without hardware changes.

Hardware Characteristics

Physical Form Factor and Mounting

The DS200TCDAH1BHF is a printed wiring board designed for installation in the Mark VI control rack within the designated digital I/O core slots (<Q11>, <Q51>, or <Q21>). Its dimensions are typical of Mark VI boards; it uses standard eurocard connectors and is secured by faceplate screws.

Connectors

Jumpers

The DS200TCDAH1BHF has eight hardware jumpers:

The IONet ID (J4–J6) defines the node address of the DS200TCDAH1BHF on the IONet. The stall timer (J7) controls the watchdog function that disables outputs if communication is lost.

LED Indicators

The document does not specify onboard LEDs for the TCDA board. Status is typically provided by the control system software and by the TCPS power supply LEDs.

Installation and Configuration

Handling Precautions

• Static sensitivity – The DS200TCDAH1BHF contains static‑sensitive components. Always wear a wrist grounding strap and handle at a grounded workstation.

• De‑energise before handling – Turn off power to the control rack and verify zero voltage before inserting or removing the board.

• Do not insert or remove with power applied – May cause equipment damage.

Installation Steps

1. Ensure the control rack is de‑energised.

2. Locate the appropriate digital I/O core slot (<Q11>, <Q51>, or <Q21>).

3. Set the hardware jumpers (J2–J7) according to the system requirements (IONet termination, node ID, stall timer). Refer to Appendix A of the Mark VI documentation.

4. Slide the DS200TCDAH1BHF into the card guides and press firmly to seat the backplane connectors.

5. Secure the faceplate screws.

6. Connect the appropriate cables:

   • JP – from TCPS power supply.

   • JQ – to DTBA terminal board.

   • JR – to DTBB terminal board.

   • JO1 / JO2 – to TCRA boards (as required).

   • JX1 or JX2 – to the IONet (TCEA or CTBA).

7. Apply power and verify that the board is recognised by the control system.

Configuration

• Hardware – Set jumpers J2–J7 as described above. J1 and J8 are for factory use only.

• Software – Use the I/O Configuration Editor on the HMI to set contact input inversion constants. No other software configuration is required.

Diagnostics and Maintenance

The DS200TCDAH1BHF does not have onboard LEDs. Diagnostics are provided by the control system software:

• Loss of IONet communication (detected via stall timer).

• Mismatch between expected and actual IONet node ID.

• Power supply failure (detected by TCPS board).

• Contact input state changes are time‑tagged and can be viewed in event logs.

No routine calibration is required. Periodic inspection for dust, corrosion, or loose connections is recommended.

Ordering Information

When ordering the DS200TCDAH1BHF, use the complete part number exactly as shown. The part number follows GE’s convention:

• DS200 – Drive / Control series.

• TCDA – Functional acronym: Digital I/O Board.

• H1 – Generation/version.

• B – Base designator.

• H – Modifier (e.g., coating or component variation).

• F – Revision F.

Warranty and Order Placement

• Warranty replacements (within warranty period): Contact GE Energy Post Sales Service.

• Spare parts or non‑warranty orders: Contact your nearest GE Sales or Service Office. Provide:

  • Complete part number: DS200TCDAH1BHF

  • Turbine control system serial number

  • Material List (ML) number

Note: All digits and letters in the part number are significant. GE may substitute later compatible revisions, but backward compatibility is assured.