Product Core Brief
- Model: IS200TDBTH6ACD
- Brand: General Electric (GE Vernova)
- Series: Speedtronic Mark VIe Turbine & Combined-Cycle Control Platform
- Core Function: Conformal coated discrete I/O terminal board providing field wiring termination, surge filtering, and galvanic isolation for contact inputs and relay trip outputs; mates with IS200VDOTH6A PDIO digital processor packs for valve, breaker, and auxiliary equipment discrete logic
- Product Type: Field termination PCB paired with Mark VIe PDIO discrete I/O packs
- Key Specs: 24 isolated DC contact inputs | 12 form-C relay outputs | Multi-voltage wetting support (24/48/125VDC) | full PCB conformal coating
- Condition: New Original (New Surplus), active OEM power generation spare with no scheduled end-of-life date
Key Technical Specifications
| Parameter | Defined Value |
|---|---|
| Discrete Input Channels | 24 galvanically isolated contact wetting inputs, software configurable for 24/48/125 VDC field supply |
| Discrete Output Channels | 12 mechanical form-C relay outputs for solenoid, breaker, and trip load drive |
| Input Wetting Current | 2.5 mA / 10 mA group selectable via internal jumpers |
| AC Noise Rejection | 12 V RMS AC threshold to filter induced cabinet wiring interference |
| Surge Protection | Transient voltage suppression diodes on all field terminals for inductive load kickback |
| Backplane Interfaces | Dual D-Sub connectors for PDIO IONet bus communication to IS200VDOTH6A packs |
| Surface Protection | Full acrylic conformal coating for high-humidity, coastal, and corrosive cabinet environments |
| Channel Isolation Rating | 1500 Vrms galvanic isolation separating field wiring and backplane logic circuits |
| Rack Supply Input | 24 VDC ±10% filtered power from Mark VIe I/O rack backplane |
| Typical Continuous Power Draw | 4.8 W under full relay loaded operating conditions |
| Standard Operating Temp | -30°C to +65°C; conformal coating extends stable operation to -40°C to +85°C offshore enclosures |
| Humidity Tolerance | 5%–95% RH non-condensing cabinet atmosphere |
| Physical Dimensions | 260 mm W × 125 mm H × 22 mm D; unit weight 0.70 kg |
| Mount Options | Standard 35 mm DIN rail or flat panel screw mounting |
| Compliance Standards | UL 508, CE EMC Class A, IEEE 1613 power control standard, ATEX Zone 2 compatible |
| Reference Manual | GEH-6721 Volume II Mark VIe System Hardware Guide |
Product Introduction
This terminal board acts as the physical wiring bridge between PDIO discrete I/O processor packs and all field contact sensors, breaker auxiliary switches, trip solenoids, and valve position feedback devices on gas and steam turbines. Onboard surge suppression eliminates relay contact arcing noise that creates false discrete fault flags during unit load transients.
The coated PCB resists oxidation in coastal power plant cabinets. It cannot execute discrete logic state evaluation independently; all digital trip and interlock algorithms run on the paired PDIO processor pack installed in the Mark VIe rack card slots.
Firmware/Software Versions & Upgrade Notes
Minimum compatible Mark VIe configuration software: ToolboxST v08.03. All PDIO digital I/O packs paired with the unit must run matching firmware builds; mismatched firmware disables channel fault diagnostics and triggers persistent IONet LINK fault alarms.Downgrades below v08.03 remove automatic input voltage range detection and jumper configuration validation reporting. All firmware flashes target the PDIO processor packs over the rack IONet bus; no programmable firmware resides on the terminal board itself. Always export discrete channel mapping, trip interlock logic, and input voltage jumper layout documentation before initiating any controller firmware update. Jumper positions must be re-verified post-flash to restore correct contact wetting voltage ranges.
Frequently Asked Questions (FAQ)
- Is hot-swap operation safe while the Mark VIe rack remains energized?The PDIO main discrete processor pack supports hot-swap with rack power active, but technicians must fully power down the I/O chassis to remove or replace the unit. Pulling the terminal board under energized conditions generates inductive voltage transients across solenoid and contact wiring that damage the PDIO input ADC circuits and disable critical turbine interlock logic permanently.
- Is this terminal board obsolescent, and are direct drop-in hardware upgrades available?This board remains an active OEM spare for Mark VIe combined-cycle fleets with no published end-of-life date. The uncoated base variant IS200TDBTH6A is not a zero-modification plug-and-play swap; it lacks corrosion protection and requires cabinet environmental validation before commissioning. TDBTH6ACX adds enhanced surge suppression for heavy industrial switchgear wiring runs.
- Will discrete interlock logic, input voltage ranges, or relay trip setpoints erase if the rack loses full power?All digital channel scaling, interlock truth tables, and fault threshold logic store in non-volatile flash memory on the paired PDIO I/O pack. The terminal board contains zero user-programmable logic storage; only physical jumper positions define input wetting voltage groups, which remain static unless manually repositioned. Full rack power loss does not erase any software-based discrete control configuration data.
- What warranty terms separate New Surplus inventory from refurbished alternatives?New Surplus terminal boards carry a 12-month functional warranty covering PCB trace continuity, screw terminal torque retention, relay contact integrity, channel isolation barriers, and D-Sub connector contact resistance. Refurbished units typically offer only 3–6 month limited coverage and carry hidden risks of degraded isolation capacitors, corroded terminal lugs, and worn relay contacts that generate intermittent false trip alarms during turbine startup and load swings.
- Why does New Surplus pricing sit higher than generic used/refurbished marketplace listings?All New Surplus inventory completes standardized QC validation: serial traceability cross-check against OEM production logs, 24-hour thermal soak bench testing with simulated contact input cycling and relay actuation sequences, 500 V megger insulation testing verifying >100 MΩ channel-to-ground isolation, full jumper configuration validation, and anti-static sealed foam packaging. Refurbished lots skip this multi-step validation workflow, introducing unplanned downtime risk for safety-critical turbine discrete interlock and trip circuits.
- Can analog 4–20mA transmitters or RTD temperature sensors wire directly to the screw terminal blocks?No, every terminal pin is dedicated to discrete contact inputs and relay trip output circuits. Analog process and thermal measurement signals require separate Mark VIe termination boards such as IS200SHRAH2AED or IS200TADC. Verify with GEH-6721 Volume II before modifying field wiring to avoid permanent channel circuit damage.
- Does the terminal board locally store discrete fault event logs or long-term equipment status trending data?No, the PCB contains no on-board memory or signal processing hardware. All discrete state change event logs, channel fault timestamps, and equipment run-time trending counters are captured and retained exclusively by the Mark VIe rack’s primary system controller CPU. The unit only delivers passive wiring termination, surge filtering, and relay drive hardware for field discrete control circuits.
