Basic Information

• Model: IS230TDBTH6A (TDBT: Discrete I/O Terminal Board)

• Brand & Series: GE Speedtronic Mark VIe Turbine Control System, TMR Triple Modular Redundant Control System

• Product Type: TMR Discrete Input/Output Terminal Board, Field Signal Interface Board, Matching Terminal Unit for PDIO Digital I/O Pack

• Compatible Systems: Mark VIe, Mark VIeS Control Systems, used with PDIO Digital I/O Packs, supports TMR redundant architecture, DIN‑rail / panel mounting

• Country of Origin: USA (GE Salem, VA Facility)

• Function: Serves as the core field discrete signal interface for the Mark VIe system, providing signal conditioning, isolation, protection and switching for 24 isolated dry contact inputs and 12 relay outputs, connecting field switches, valves, actuators to PDIO controllers for digital signal acquisition and drive control, supporting TMR redundant bumpless switching.

Product Overview

Core Functions

1. 24 Isolated Discrete Inputs: 24 group‑isolated dry contact inputs, supporting external wetting voltage of 16–32VDC, 32–64VDC, 100–145VDC (nominal 24/48/125VDC), independent current limiting per channel (2.5mA for channels 1–21, 10mA for channels 22–24), 4ms hardware filtering, surge suppression and noise suppression to prevent interference and overvoltage damage.

2. 12 Relay Outputs: 12 Form‑C (SPDT) relay outputs with silver‑cadmium oxide contacts, typical on/off response time of 25ms, supporting dry contact / load driving, expandable with WROBH1 option board for independent relay power control and dry contact configuration.

3. TMR Redundant Interface: 3 PDIO connection points (JR1/JS1/JT1) connecting to R/S/T controllers respectively, supporting triple modular redundant bumpless switching, single channel failure does not affect system operation, adapted to Mark VIe TMR architecture.

4. Signal Protection & Diagnosis: Built‑in MOV varistors, resettable PTC fuses (0.5A current limit on 24VDC side), isolation circuits; supports wetting voltage loss, input failure, relay status and fuse status diagnosis, feeding back to PDIO system for fast fault location.

5. Flexible Installation & Wiring: DIN‑rail / panel mounting, dual Euro‑style pluggable terminal blocks (TB1: relay outputs, TB2: input signals), compatible with 24–12AWG cables, shield grounding design, simplifying field wiring and maintenance.

6. Industrial‑Grade Reliable Design: Wide temperature range, anti‑vibration, moisture/dust resistant, conformal coating, UL94 V‑0 flame retardant, suitable for harsh working conditions with strong EMI and hazardous areas, high MTBF and long‑term stable operation.

Technical Specifications

• Input: 24 group‑isolated dry contact inputs; Wetting voltage: 24/48/125VDC (16–32/32–64/100–145VDC); Input current: 2.5mA (ch1–21), 10mA (ch22–24); Input filter: 4ms hardware filter; Isolation: Group electrical isolation

• Output: 12 Form‑C (SPDT) relays; Contact material: Silver‑cadmium oxide; Contact rating: Standard industrial load; Response time: On/off ≤25ms; Expansion: Supports WROBH1 relay option board

• Interfaces: Terminal blocks TB1 (relay outputs), TB2 (input signals); D‑type connectors JE1 (wetting voltage), JW1/JW2 (option board); JR1/JS1/JT1 (PDIO redundant connections)

• Power: Internal logic 5VDC (backplane/PDIO power); External wetting voltage: 24/48/125VDC (JE1 input); 24VDC auxiliary power: PTC 0.5A current limit protection

• Environment: Operating -30°C to +65°C; Storage -40°C to +85°C; Relative humidity 5%–95% (non‑condensing); Protection: IP20 (cabinet‑mounted), conformal coating, anti‑EMI/anti‑vibration

• Dimensions: 17.8cm(W) × 33.02cm(H); Weight approx. 0.8kg; Mounting: DIN‑rail / panel mounting with metal carrier

• Certifications: CE, UL, Class I Div 2 (hazardous location approved); Redundancy level: TMR Triple Modular Redundant

• Matching Components: PDIO Digital I/O Pack, WROBH1 Relay Expansion Board, IS200TDBTH6ABC (core PCB of IS230TDBTH6A)

Typical Applications

• Discrete signal acquisition (switches, limits, pressure/temperature contacts) and drive control (valves, solenoids, alarm circuits) for Mark VIe/Mark VIeS gas/steam turbine control systems

• TMR triple redundant digital I/O interface ensuring reliable signal transmission for turbine start/stop, speed regulation, protection and interlock control

• Discrete signal interface for generator sets in combined‑cycle power plants, thermal power plants, petrochemical drive units and offshore platforms

• Legacy Mark VI system upgrades, PDIO I/O pack terminal replacement, field signal interface expansion retrofits

• Dry contact input, relay output, signal isolation and anti‑interference protection in industrial control systems