IS200TDBTH2A | GE Mark VIe | Discrete Terminal Board

GE IS200TDBTH2A Mark VI Discrete I/O Terminal Board — 24-Input, 12-Relay Output, TMR

The IS200TDBTH2A is a Discrete I/O Terminal Board (TDBT) for GE's Mark VI turbine control platform. It provides 24 group-isolated contact inputs and 12 Form-C relay outputs, serving as the critical interface between field devices and the control core for gas and steam turbine applications. The board supports Triple Modular Redundancy (TMR) architecture and connects to PDIO I/O packs for high-availability control.

Key Specifications

• Manufacturer: General Electric / GE Energy
• Series: Mark VI / Speedtronic
• Type: Discrete I/O Terminal Board
• Contact Inputs: 24 group-isolated
• Input Voltage: 24 VDC nominal
• Input Range: 16–32 VDC
• Wetting Voltage: 24 VDC (external source)
• Relay Outputs: 12 Form-C (expandable with option board)
• Power Requirements: +5 VDC (from I/O pack)
• Operating Temperature: -30°C to +65°C
• Mounting: DIN rail or flat panel
• Dimensions: 17.8 cm × 33.02 cm
• Weight: ~1.10 kg
• PCB Coating: Conformal coating (moisture/salt spray/mildew resistant)
• Manufactured In: Salem, VA, USA

Architecture & Connectivity

• TMR Compatible: Supports Triple Modular Redundancy with PDIO I/O packs
• I/O Pack Connections: JR1, JS1, JT1 connectors for R/S/T controllers
• Communication: Ethernet via PDIO I/O packs to controllers
• Option Board: WROBH1 relay option board plugs into JW1/JW2 for expanded relay functionality
• Terminal Blocks: Two large terminal blocks with silver metal cube terminals; three connector ports with female connectors

Installation Guide

1. Mount the TDBT board on a sheet metal carrier with plastic insulator — DIN rail or cabinet panel.
2. Wire input contact circuits to the lower terminal set (typically #18 AWG).
3. Wire relay output circuits to the upper terminal set.
4. If using the relay option board, plug WROBH1 into JW1/JW2 connectors.
5. Connect PDIO I/O packs for TMR or simplex operation.
6. Ensure shield termination brackets are used for proper EMI protection.

FAQ

Q: What is the difference between IS200TDBTH2A and IS200TDBTH6A?
A: IS200TDBTH2A is for Mark VI systems with 24 VDC wetting voltage. IS200TDBTH6A is for Mark VIe systems and supports multiple wetting voltages (24/48/125 VDC). IS200TDBTH2A is the lowest voltage variant among TDBT boards.

Q: Can I use a single PDIO I/O pack with IS200TDBTH2A?
A: For TMR, three PDIO packs are required (one per controller). For dual controllers, two PDIO packs connect to JR1 and JS1, with JT1 connected to both.

Q: Does the board have hardware configuration jumpers?
A: The TDBT itself has no jumpers. Six jumpers on the WROBH1 option board control relay power distribution — remove jumpers for dry contact operation.

Q: What protection is built into the inputs?
A: Hardware filters and noise suppression guard against surges and high-frequency noise. Optical isolation to 1500 V protects the control core from field-side interference.

Q: Is this board compatible with Mark VIe systems?
A: No. IS200TDBTH2A is designed for Mark VI systems. Mark VIe uses IS200TDBTH6A with different I/O pack architecture.

Selection Tips

• Mark VI, 24 VDC, 24 DI + 12 DO relay, TMR: IS200TDBTH2A
• Mark VIe, 24/48/125 VDC, 24 DI + 12 DO relay, TMR: IS200TDBTH6A
• Ensure PDIO I/O packs are available — three required for full TMR
• Order WROBH1 option board if expanded relay functionality is needed
• Always use shielded cables with proper grounding for noise-sensitive turbine applications