Description
1. Product Overview
Part Number: IS200CABPG1BAA, base part IS200CABPG1B; suffix BAA denotes final hardware revision and factory firmware configuration.
Manufacturer: General ElectricSystem Affiliation: Core backplane motherboard for the Speedtronic Mark VI Innovation Series gas & steam turbine control system. Only factory surplus stock, refurbished used units and project redundant spares are available for supply. It serves as the central power distribution and signal interconnection backplane inside control cabinets of combined-cycle thermal power units and large chemical compressor sets.Model Abbreviation Definition
- CABP: Control Assembly Backplane
G1: 1st generation hardware architecture; B: Hardware Revision B; AA: Factory configuration & inspection batch
Product Definition: A passive 5-slot bus backplane motherboard without on-board processing chips. Its core functions include power distribution to sub-boards, interconnection via ISBus system bus, signal transfer for front panel peripherals, and aggregation of diagnostic links. Multiple standard connectors are reserved on the board to interface with system power supply modules, front panel keypad units, analog meter display units, diagnostic debug ports and ISBus communication bus. Five slots accept CPU main control cards, I/O acquisition cards, communication cards, protection logic cards and other functional daughterboards. All power supply and internal data exchange of plug-in cards are routed uniformly through this backplane, which acts as the signal and power hub of the entire Mark VI control cabinet. Damage to the backplane will directly result in disconnection of the whole control rack and loss of unit main control.
2. Six Core Hardware Functional Units
2.1 5-Slot Daughterboard Bus Interconnection Unit
Equipped with 5 standardized Eurocard slots for vertical insertion of Mark VI series plug-in cards, with mechanical anti-reverse insertion latches to prevent component burnout from misorientation. Multi-layer copper foil bus traces embedded inside the backplane enable ISBus parallel data bus communication between all plug-in boards without extra cross wiring, simplifying cabinet wiring layout.
2.2 Centralized System Power Distribution Unit
A dedicated power input connector is reserved to mate with the matching IS200HFPA power supply module. The input power is filtered and fused on-board before being distributed as isolated operating power to each of the 5 slots independently. Each branch is equipped with current limiting protection; short circuit on one daughterboard only cuts off power to the corresponding slot without breaking the overall power loop, realizing localized fault isolation.
2.3 Front Panel Peripheral Signal Transfer Unit
A multi-pin integrated connector routes wiring to the cabinet front panel, receiving keypad commands, analog meter display signals and local pushbutton status. Human-machine interaction signals are aggregated by the backplane and distributed to the corresponding main control card. Front panel disassembly and maintenance will not alter the core control bus inside the rack.
2.4 ISBus External Expansion Bus Unit
Multiple external ISBus communication ports support multi-rack cascading networking, remote IO substation access and upper-level SCADA system connection. Acting as a bus hub, the backplane transparently forwards protocols between the internal rack bus and external system bus to enable coordinated control of large unit systems across multiple Mark VI cabinets.
2.5 Centralized Hardware Diagnostic Monitoring Unit
A dedicated debug port extracts low-level diagnostic data including backplane supply voltage, slot presence status, bus communication error codes and abnormal branch power supply. The main control card polls backplane status periodically and uploads alarms to the unit DCS HMI upon bus interruption, under-voltage or poor contact to predict hardware failures in advance.
2.6 Industrial Reinforced Anti-Vibration Environmental Unit
Double-sided conformal coating against moisture, salt fog and corrosion is applied to the gold-plated FR-4 PCB. Fanless passive cooling relies on cabinet air convection. Aging-prone electrolytic capacitors are eliminated; only long-lifetime passive components such as metal film resistors and ceramic capacitors are used. It withstands dust accumulation inside sealed cabinets, long-term low-frequency vibration from turbine bases and high-humidity coastal environments for 24/7 unattended operation.
3. Technical Specifications
3.1 Basic Hardware Specifications
| Item | Specification |
|---|---|
| Part Number | IS200CABPG1BAA |
| Type | Mark VI Innovation Series 5-Slot Passive Control Backplane (CABP) |
| Slot Quantity | 5 vertical Eurocard slots with anti-misinsertion locks |
| Compatible Power Module | IS200HFPA dedicated power supply |
| External Interfaces | ISBus ports, front panel I/O connector, diagnostic port, power input port |
| Approx. Dimension | 330mm × 90mm × 20mm |
| Net Weight | Approx. 0.75kg |
3.2 Electrical Bus & Power Parameters
- Bus Standard: ISBus parallel internal system bus
- Per-Slot Rated Output Power: Load-dependent with on-board branch current limiting fuses
- Input Power: Multiple isolated DC voltages supplied centrally by HFPA module
- Dielectric Withstand Voltage Between Slots & Chassis: ≥1500VAC
- Mechanical Insertion Lifespan: ≥1000 reliable plug/unplug cycles
- Signal Mode: Pure passive wiring without signal amplification or logic processing, only circuit routing
3.3 Environmental & Safety Compliance
- Operating Temperature: 0℃ ~ +65℃
- Storage & Transport Temperature: -40℃ ~ +85℃
- Humidity: 5%~95%RH non-condensing, free of corrosive gas and salt fog deposition
- Ingress Protection: IP20, for installation only inside sealed industrial control cabinets
4. Product Advantages
- Centralized bus architecture consolidates power supply and inter-module communication in one backplane, eliminating excessive cross wiring and reducing hidden faults from loose or aged cables.
- Independent branch protection per slot limits fault impact; a shorted daughterboard will not damage the backplane or adjacent cards, allowing isolated maintenance without full system shutdown.
- Unified transfer of front panel HMI signals isolates panel maintenance from core control bus to simplify on-site servicing.
- Fully passive design with no consumable logic components results in extremely low intrinsic failure rate; most system faults originate from plug-in daughterboards rather than the backplane itself.
- Full backward compatibility with legacy IS200CABPG1A revision; direct drop-in replacement requires no cabinet rewiring or configuration modification.
- Extensive installed base on GE 6FA/9FA combined-cycle units in domestic power plants with proven mature spare part replacement schemes requiring no control logic program revision.
5. Application Scenarios
1. Main Control Cabinets of Combined-Cycle Thermal Power Plants
Serves as the core motherboard for gas turbine main control racks, providing power and communication interconnection for CPU cards, speed monitoring cards, I/O cards and trip protection logic cards to support unit startup, load regulation and emergency trip protection.
2. Turbine Control Systems for Large Process Compressors in Petrochemical Industry
Backbone bus board for anti-surge and speed control cabinets of cracking gas and recycle hydrogen compressors, coordinating valve actuation, pressure/flow acquisition and interlock trip loops to ensure uninterrupted chemical production.
3. Captive Power & Waste Heat Generation Steam Turbine Electronic Control Systems
Backplane for speed governing, lube oil interlock and vacuum monitoring cabinets, linking field signal acquisition and command output with plant DCS for remote supervision and interlock execution.
4. Retrofit & Spare Replacement for Legacy Mark VI Control Systems
Direct in-situ replacement for backplanes with broken traces, oxidized slot pins or detached solder pads; all existing daughterboards, power cables and panel wiring are fully reusable with no drawing or construction modification.
