GE Mark VIe IS200TDBTH6A Discrete I/O Terminal Board

GE Fanuc IS200TDBTH6A Mark VIe Discrete I/O Terminal Board — 24-Input, 12-Relay Output, TMR

The IS200TDBTH6A is a Discrete Input/Output Terminal Board (TDBT) for GE's Mark VIe turbine control platform. It provides 24 group-isolated contact inputs and 12 Form-C relay outputs, serving as a critical interface node for deterministic signal processing in steam and gas turbine control systems. The board supports Triple Modular Redundancy (TMR) architecture and connects to PDIO I/O packs via Ethernet for high-availability control.

Key Specifications

• Manufacturer: General Electric / GE Vernova
• Series: Mark VIe / Speedtronic
• Type: Discrete I/O Terminal Board
• Contact Inputs: 24 group-isolated
• Wetting Voltage: 24, 48, or 125 VDC (external source)
• Input Wetting Range: 16–32 VDC (24V); 32–64 VDC (48V); 100–145 VDC (125V)
• Input Current: 2.5 mA (circuits 1–21); 10 mA (circuits 22–24)
• AC Voltage Rejection: 12 V RMS
• Relay Outputs: 12 Form-C (expandable with option board)
• Power Requirements: +5 VDC (from I/O pack)
• Operating Temperature: -30°C to +65°C
• Technology: Surface Mount
• Dimensions: 17.8 cm × 33.02 cm
• Mounting: Flat panel or DIN rail (with sheet metal carrier + plastic insulator)
• Manual: GEH-6721L

Architecture & Connectivity

• TMR Compatible: Supports Triple Modular Redundancy with three PDIO I/O packs
• I/O Pack Connections: JR1 (R controller), JS1 (S controller), JT1 (T controller)
• 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 sets of 48 barrier-type terminals — TB1 (relay section), TB2 (input section)

Installation Guide

1. Mount the TDBT board on a sheet metal carrier with plastic insulator — either DIN rail or cabinet panel.
2. Wire input contact circuits to the lower terminal set TB2 (typically #18 AWG).
3. Wire relay output circuits to the upper terminal set TB1.
4. If using the relay option board, plug WROBH1 into JW1/JW2 connectors.
5. Connect three PDIO I/O packs to JR1, JS1, and JT1 for TMR operation.
6. Ensure shield termination brackets are used for proper EMI protection.
7. Configure relay jumpers on WROBH1: remove jumpers for dry contacts (no power distribution needed).

FAQ

Q: Can I use a single PDIO I/O pack with IS200TDBTH6A?
A: No. A single PDIO cannot properly operate TDBT. 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: What wetting voltages are supported?
A: 24 VDC, 48 VDC, or 125 VDC — selectable via external power source. Input thresholds scale accordingly (threshold = ½ wetting voltage).

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. Circuits 22–24 have higher current limiting (10 mA vs 2.5 mA) for special applications.

Q: Is this board compatible with Mark VI (non-e) systems?
A: No. IS200TDBTH6A is designed for Mark VIe systems with PDIO I/O packs. Mark VI systems use different terminal boards and I/O pack architectures.

Selection Tips

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