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TECHNICAL SPECIFICATIONS:
Part Number: IS200VCMIH1CBA
Manufacturer: General Electric (GE) / GE Vernova
Series: Speedtronic Mark VI
Functional Acronym: VCMI
Product Type: Bus Master Control Board / VME Communication Interface
Hardware Revision: H1CBA
Slot Compatibility: Slot 1 of the Mark VI VME Control Rack (R, S, T, and X spaces)
Communication Networks: IONet (Input/Output Network), UDH (Universal Data Highway)
IONet Interface: 10Base-FL Fiber Optic Ethernet connection
Data Transfer Rate: 100 Mbps internal processing / 10 Mbps optical network link
Processor Type: High-performance onboard microprocessor architecture
Diagnostic LEDs: Run, Fail, Status, Flash, and Network activity indicators
Interface Port: Front-panel RS-232 serial configuration port
Internal Data Bus: Standard 16-bit and 32-bit VMEbus backplane architecture
Cooling Requirements: Forced air ventilation within the VME rack assembly
Operating Temperature: 0�C to +60�C (32�F to +140�F)
Form Factor: Standard 6U single-slot VME board layout
Diagnostic Features: Real-time tracking of I/O packet drops, memory health, and rack configurations
Repair Lead Time: 3�5 Business Days
Availability: In Stock / Repair & Exchange Available
Country of Origin: United States
IS200VCMIH1CBA is a Bus Master Control Board designed and manufactured by General Electric as part of the Mark VI Series used in GE Speedtronic Control Systems. The VCMI board in the control and interface module communicates internally to the I/O boards in its rack, and to the other VCMI cards through the IONet. There are two versions, one with one Ethernet IONet port for simplex systems, and the other with three Ethernet ports for TMR systems. Simplex systems have one control module connected to one or more interface modules using a single cable. The VCMI with three separate IONet ports is used in TMR systems for communication with the three I/O channels Rx, Sx, and Tx, and with the two other control modules. Software-Implemented Fault Tolerance (SIFT) voting is implemented on the VCMI board. Input data from each of the IONet connections is voted in each of the R, S, and T VCMI boards. The results are passed to the control signal database in the controllers (labeled UCVx in the diagram) through the backplane VME bus.
In TMR mode, the VCMI voter in the control module is always the Master of the IONet and also provides the IONet clock. Time sync messages from the time source on the UDH are sent to the controllers and then to the VCMIs. All input data from a single rack is sent in one or more IONet packets (approximately 1500 bytes per packet maximum). The VCMI in the control module broadcasts all data for all remote racks in one packet, and each VCMI in the remote rack extracts the appropriate data from the packet.
VMEBUS MASTERING AND BACKPLANE COORDINATION:
The IS200VCMIH1CBA manages all backplane traffic across the 16-bit or 32-bit VMEbus array. It reads control outputs calculated by the main rack processors and translates them into uniform data structures. Conversely, it samples real-time sensor bytes from adjacent rack slots and maps them cleanly into shared memory blocks. In a typical Triple Modular Redundant (TMR) system layout, an identical VCMI board operates seamlessly in the R, S, and T racks, keeping all three processing branches fully synchronized with minimal transmission jitter.
IONET FIBER OPTIC PIPELINE:
For external data distribution, the H1CBA configuration utilizes a high-speed IONet (Input/Output Network) interface running over 10Base-FL fiber optic pathways. This fiber-optic infrastructure isolates the main control rack from dangerous industrial high-voltage spikes, ground loops, and electromagnetic interference (EMI) originating in remote turbine termination cabinets. The VCMI broadcasts deterministic command frames down the fiber lines to the local I/O packs and aggregates incoming sensor responses on every control loop task cycle.
SYSTEM COUPLING AND FRONT-PANEL INTERFACES:
The front-panel interface of the IS200VCMIH1CBA features a diagnostic RS-232 serial connection alongside a dedicated array of status LEDs. These indicators display real-time module health data, network link continuity, and flash memory states. The onboard hardware platform is supported by non-volatile flash configurations containing a factory-written Board-ID Chip matrix, ensuring the active system control framework can interrogate the card at boot up to verify correct part numbers and revision matches.
World of Controls provides the industry's most dependable logistics and technical infrastructure for critical turbine control networks. We maintain an extensive inventory of genuine OEM replacement parts for GE Speedtronic control setups, minimizing operational downtime during emergency outages. Every item, from certified unused surplus to fully rebuilt industrial components, is subjected to strict simulation profiling in our advanced electronics lab and is supplied with a comprehensive product warranty. Our global engineering support network operates 24/7 to deliver troubleshooting advice, component replacement guidance, and component testing evaluations. Contact the WOC sales team directly via phone or email for current pricing, hardware availability, or repair quotes.
What is the GE IS200VCMIH1CBA?
The IS200VCMIH1CBA is a VME Communication Interface (VCMI) board manufactured by General Electric for the Mark VI Speedtronic control platform. It serves as the master communication hub for the control rack, bridging the internal VMEbus backplane with external fiber-optic I/O networks (IONet) and supervisory networks (UDH).
Why must the VCMI board be placed specifically in Slot 1?
The board is designed to function as the VMEbus Master. Slot 1 contains the hardware pins dedicated to managing backplane clocking, timing signals, and data arbitration across the entire VME rack. Placing the VCMI board in any other slot will cause initialization failures and halt communication with adjacent processors.
What is the benefit of the fiber optic IONet ports on the front panel?
The 10Base-FL fiber optic interfaces allow the control rack to exchange data with decentralized I/O blocks over long distances without risking electrical noise corruption. Fiber optics provides near-infinite electrical isolation, protecting the core control processors from field ground loops or high-voltage inductive spikes.
What do the front-panel status LEDs indicate?
The LED bank provides instant hardware health visibility. The Run LED confirms the internal microprocessor is active, Fail indicates a critical hardware or startup fault, and the network status LEDs cycle rapidly to confirm stable fiber link traffic on the IONet channels.
