Basic Information

• Model: IS200TDBTH6ABC (TDBT: Discrete I/O Terminal Board), Material Code: MRP768176

• Brand & Series: GE Speedtronic Mark VI Turbine Control System (not Mark VIe), Simplex Control Architecture

• Product Type: Discrete I/O Core PCB, Core Circuit Board for TDBT Terminal Board, Digital Signal Interface Board for Mark VI Simplex System

• Compatible Systems: GE Mark VI Speedtronic Gas/Steam/Hydro Turbine Control Systems, Simplex Architecture, used with PDIO Digital I/O Packs and IS230TDBTH6A Terminal Faceplate

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

• Function: Serves as the core discrete signal processing PCB for the Mark VI Simplex system, performing signal isolation, conditioning, protection and backplane communication for 24 dry contact inputs and 12 relay outputs, connecting field switches/actuators to the controller for digital signal acquisition and drive control; it is the internal core circuit board of the IS230TDBTH6A terminal unit.

Product Overview

Core Functions

1. 24 Isolated Discrete Input Processing: 24 group‑isolated dry contact inputs supporting 24/48/125VDC external wetting voltage (16–32/32–64/100–145VDC), with independent current limiting per channel, 4ms hardware filtering and surge suppression to filter electromagnetic interference and prevent overvoltage damage, suitable for field switch, limit and pressure contact signal acquisition.

2. 12 Relay Output Driving: 12 Form‑C (changeover) relay outputs with silver‑cadmium oxide contacts, fast response (≤25ms), supporting dry contact/load driving for valve, solenoid, alarm circuit and interlock control output.

3. Signal Protection & Isolation: Built‑in MOV varistors, resettable PTC fuses (0.5A current limit) and channel‑to‑channel electrical isolation to block ground loops and common‑mode interference, protecting field equipment and controller safety.

4. Status Monitoring & Diagnosis: 3 LED indicators (Power/Communication/Fault) for real‑time feedback of module operation status and branch anomalies, enabling fast fault location with system diagnosis.

5. Backplane Communication & Integration: Dual backplane connectors for connection to the Mark VI I/O rack, communicating with PDIO digital I/O packs and controllers for signal upload and command download; dedicated for simplex architecture, does not support TMR redundancy.

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, ensuring 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; Response time: On/off ≤25ms; Contact rating: Standard industrial load

• Interfaces: Dual backplane connectors (connect to Mark VI rack/PDIO); Terminal block interfaces (connect to IS230TDBTH6A faceplate TB1/TB2); Faceplate LEDs: 3 (PWR/COM/FAULT)

• Power: Internal logic 5VDC (rack backplane power); External wetting voltage: 24/48/125VDC; 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

• Form Factor: Standard PCB, fits Mark VI Simplex system I/O rack single slot; Dimensions approx. 17.8cm × 33.02cm; Weight approx. 0.5kg; Assembly: Used with IS230TDBTH6A terminal faceplate/enclosure

• Certifications: CE, UL, Class I Div 2 (hazardous location approved); Architecture: Simplex (non‑TMR redundant)

• Material Code: MRP768176 (unique MRP number for IS200TDBTH6ABC)

Typical Applications

• Discrete signal acquisition (switches, limits, pressure/temperature contacts) and drive control for Mark VI Simplex gas/steam/hydro turbine control systems

• Digital I/O interface, signal isolation and protection for simplex control architecture of generator sets in power plants, petrochemical facilities and offshore platforms

• Replacement of legacy TDBT terminal boards, simplex I/O interface upgrades and core PCB fault repair/replacement for Mark VI systems

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