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3. Key Technical Specifications
| Parameter | Value |
|---|---|
| Board Type | 6U high VME board |
| Function | Master Communication Controller (VCMI) |
| System Compatibility | GE Mark VI Speedtronic |
| Redundancy Support | TMR (Triple Modular Redundant) |
| IONet Ports | 3× 10Base2 Ethernet (BNC) |
| Processor | Texas Instruments TMS320C32 32-bit DSP |
| Memory | Dual-port memory, SRAM, Flash |
| Serial Port | 1× RS-232C (male D-sub) |
| Operating Temperature | Approximately –30 to 65 °C |
| Form Factor | VME, approximately 0.787 inch wide |
| Key Features | SIFT voting, status LEDs, reset switch |
| Mounting Location | Typically slot 1 of the Control Module rack |
4. Product Introduction
The IS200VCMIH2BEE is a VME Communication Interface (VCMI) board used in GE Mark VI Speedtronic turbine control systems. It serves as the master communication controller that links the central controller with I/O boards in the same rack and with remote racks via the IONet Ethernet network.
This is the TMR (triple modular redundant) version equipped with three IONet ports. It uses software-implemented fault tolerance (SIFT) voting and broadcasts data to remote racks. The board is based on a Texas Instruments TMS320C32 digital signal processor and includes dual-port memory, SRAM, flash, an RS-232 serial port, status LEDs, and a reset switch. It is a critical component for reliable high-speed data exchange in gas and steam turbine control applications.
IS200VCMIH2BEE
IS200VCMIH2BEE
5. Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No communication with I/O boards | Board not seated or failed VCMI | ✅ High | Reseat board; check power and status LEDs | Verify seating and replace if LEDs indicate fault |
| IONet communication loss | Cable, connector, or port failure | ✅ High | Inspect BNC cables and terminations; check link status | Replace cables or the VCMI board |
| TMR disagreement / voting faults | One or more channels offline | ✅ High | Compare data across R/S/T channels | Isolate failed channel; replace faulty VCMI |
| Board will not boot | Power supply or internal failure | ✅ High | Check rack power and board voltage rails | Verify power distribution; replace board |
| Serial port unresponsive | Cable or configuration issue | ⚠️ Medium | Test with known-good cable and terminal settings | Confirm baud rate and cabling |
| Intermittent faults | Overheating or marginal components | ⚠️ Medium | Check cabinet temperature and airflow | Improve cooling; monitor for recurring faults |
If power, seating, and network cabling checks do not resolve the issue, replace the IS200VCMIH2BEE. Always follow proper ESD and lockout procedures when handling Mark VI boards.
6. Frequently Asked Questions (FAQ)
Q: What is the primary function of the IS200VCMIH2BEE? A: It is the VME Master Communication Controller (VCMI) board that handles internal rack communication and IONet Ethernet communication to other Mark VI racks and modules.
Q: Is this a Simplex or TMR board? A: This is the TMR (Triple Modular Redundant) version with three IONet ports.
Q: What processor does it use? A: Texas Instruments TMS320C32 32-bit digital signal processor.
Q: What system is it used in? A: GE Mark VI Speedtronic turbine control systems for gas and steam turbines.
Q: Is the Mark VI platform still supported? A: Mark VI is a legacy platform. Many sites continue to operate it, but new projects typically use Mark VIe or later systems. Remaining IS200VCMIH2BEE boards are new surplus or refurbished. Condition is clearly stated as New Original / New Surplus.
Q: Why is a new-surplus IS200VCMIH2BEE often priced lower than current Mark VIe modules? A: It is an end-of-life Mark VI component. New-surplus stock comes from project overstock or decommissioned systems, is tested, and is sold at a reduced price while still carrying warranty.
Q: Where is the board typically installed? A: In slot 1 of the Mark VI Control Module (VME rack).
