Description
1. Product Overview
Part Number: IS200ERIOH1A (complete part code: IS200ERIOH1AAA)
Manufacturer: GE General Electric. It is a dedicated excitation I/O interface board for EX2100/EX2100e generator excitation regulation system and Speedtronic Mark VI/VIe gas & steam turbine control system. only factory surplus stock and refurbished used spare parts are available, serving as a standard critical spare part for excitation cabinets of thermal & hydropower generating units.
Compatible Backplanes: Simplex configuration matches ERBP Exciter Regulator Backplane; Triple Modular Redundancy (TMR) architecture works with ERRB Redundant Relay Backplane. It supports simplex single-card and TMR triple redundant operation, and must be networked with ERDD excitation interface board, EROC option card and ERRR redundant relay board for coordinated operation.
2. Six Core Hardware Functional Units
2.1 8-Channel Isolated DI Input Acquisition Unit
8 fully electrically isolated passive dry contact input loops powered by 24VDC from the backplane, compatible with 24~125VDC field passive contact signals. Each channel integrates TVS surge suppression, filter diodes and voltage divider current limiting circuits with 3000VAC inter-channel isolation to eliminate ground loop interference from long cables in heavy EMI power plant environments. It accurately identifies switch states including disconnecting switch position, local start/stop, fault feedback and remote permission, with no crosstalk between channels during single-point faults.
2.2 8-Channel Relay DO Control Output Unit
8 independent SPDT relay output contacts driven by logic commands from the main control system. The contacts can be directly wired to trip loops, audible & visual alarms, excitation start/stop interlock and cabinet door interlock hardwired circuits. On-board surge absorption circuits suppress back EMF from inductive loads to prevent breakdown of on-board driver chips, realizing executive-level control output from the excitation system to field equipment.
2.3 FPGA Logic & Dual-Port Memory Interaction Unit
An on-board FPGA (Field Programmable Gate Array) polls input channel status, latches output instructions issued by the upper controller, and writes all I/O point data into DPM dual-port memory. Two 25-pin connectors P1/P2 enable high-speed bidirectional data exchange with the main CPU and excitation regulation board via ERBP/ERRB backplane bus. A hardware watchdog automatically resets the module upon program exception to avoid channel lockup and out-of-control operation.
2.4 Backplane Bus & Redundancy Configuration Unit
The rear gold-plated double-height VME edge connector interfaces with the rack parallel backplane and natively supports Mark VI proprietary bus protocol. A single card fulfills all I/O point processing in simplex mode; TMR redundancy requires 3 identical modules installed in adjacent slots for automatic 2-out-of-3 voting to eliminate false trip or protection failure caused by single-card hardware faults, complying with SIL2 functional safety interlock standards for power generation units.
2.5 On-Board DIP Switch Hardware Configuration Unit
A DIP switch bank on the PCB sets rack slot address, redundancy mode enable, channel bypass permission and fault reporting mode. No software download is required for basic hardware addressing; the rack automatically recognizes the module ID and point mapping after power-on. Single-channel software bypass allows maintenance on individual loops without disabling interlock logic of the entire excitation system.
2.6 Industrial Reinforced Conformal Coating Unit
The full multi-layer gold-plated FR-4 PCB is coated with moisture, salt-fog and corrosion resistant conformal coating. Fanless passive heat dissipation relies on cabinet airflow. No consumable fuses or adjustable potentiometers are fitted to withstand high temperature & dust accumulation inside sealed cabinets, long-term low-frequency vibration from turbine unit bases and humid coastal environments, enabling 24/7 unattended maintenance-free continuous operation.
3. Technical Specifications
3.1 Basic Hardware Specifications
| Item | Specification |
|---|---|
| Model | IS200ERIOH1A (Full Part No.: IS200ERIOH1AAA) |
| Rack Form Factor | Standard double-height single-slot VME module for Mark VI |
| Channel Allocation | 8 isolated passive DI inputs + 8 relay DO outputs |
| Power Supply | 24VDC from rack backplane |
| Typical Power Consumption | ≤5W |
| Net Weight | 0.45~0.8kg |
| Origin | Original USA GE Manufacture |
3.2 Core Electrical Parameters
- DI Input: Passive dry contact, 24~125VDC compatible, input impedance＞100kΩ, 3kVAC isolation between channels
- DO Output: SPDT relay contacts, rated load 3A/250VAC
- Bus Interface: Dual 25-pin P1/P2 connectors for backplane link, Mark VI native parallel VME bus
- Redundancy Rule: Simplex = 1 card; TMR voting = 3 matched modules
- Self-Diagnosis: Automatic detection of open/short circuit, relay adhesion and backplane communication loss with fault alarm upload
3.3 Environmental & Safety Compliance
- Operating Temperature: -40℃ ~ +85℃
- Storage & Transport Temperature: -40℃ ~ +125℃
- 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
- Integrated I/O architecture exclusive to EX2100 excitation system, combining input acquisition and contact output on one single board to reduce cabinet wiring and intermediate terminal fault points, with no third-party drop-in replacement available.
- Hardware isolation and multi-stage surge suppression eliminate common field faults including point value fluctuation, false acquisition and accidental relay actuation caused by strong electromagnetic fields inside excitation panels.
- TMR 2-out-of-3 voting hardware architecture eliminates single-point failure risks at the bottom layer, meeting strict high-reliability interlock requirements for excitation trip circuits of large power generation units.
- DIP switch addressing enables plug-and-play replacement; only simple address configuration is needed for spare modules, with automatic rack recognition and no reconfiguration of point mapping or program download to minimize outage duration during emergency maintenance.
- Granular channel-level bypass permits on-site maintenance of field cables and sensors on a single loop while remaining interlock protection loops stay online without unit load reduction or shutdown.
- Comprehensive built-in fault diagnosis pinpoints hardware damage, field wiring open/short circuit and backplane communication loss with pop-up fault codes on upper DCS and configuration software to shorten troubleshooting cycles.
5. Application Scenarios
1. Combined-Cycle Thermal Power Gas & Steam Turbine EX2100 Excitation System
Standard I/O interface card for generator excitation cabinets, collecting status signals from de-excitation switch, field flashing circuit, local control pushbuttons and cooling fans, and output hardwired commands for excitation switch-on, unit trip, fault alarm and inverter de-excitation, serving as essential external interlock hardware for grid-connected excitation regulation.
2. Large & Medium Hydropower Unit Excitation Control Cabinet
Conformal coating prevents PCB corrosion from humid mist in hydropower plants, enabling signal exchange between the excitation system, governor, gate mechanism and synchronizing device to guarantee stable grid connection and fast unit trip during faults.
3. Captive Power Plants in Metallurgy & Chemical Industry Waste Heat Power Generation
Facilitates hardwired signal interaction between the excitation system, plant-wide DCS and relay protection devices under complex industrial EMI environments to realize remote start/stop, fault uploading and interlock trip functions.
4. Expansion & Spare Replacement for Legacy Mark VI / EX2100 Excitation Systems
Direct in-situ replacement for aging I/O modules with damaged channels, worn relays or communication failure; existing configuration and wiring are fully reusable with minimal system modification to restore full interlock control of the excitation system.
