Configured for deterministic VME‑bus communication in Mark VI turbine control networks, the GE IS200VCMIH2BE (IS200VCMIH2B VCMI master controller board) provides direct physical/electrical execution. It performs rack‑level communication routing, IONet fiber‑optic distribution, and backplane arbitration for simplex and TMR Mark VI architectures.
Hardware Specifications
Parameter
Specification
Model
IS200VCMIH2BE
Brand
GE
Origin
USA
Series
Mark VI
Product Type
VME Bus Master Controller Board
IONet Ports
Three fiber‑optic ports (TMR) or one port (simplex)
Serial Port
One male serial port
LED Indicators
Four LED groups (3, 6, 8, 3 LEDs)
Board Format
Double‑sided PCB
Connectors
Dual backplane connectors, fiber‑optic ports, serial port
Core Performance
VME bus master control, IONet routing, SIFT voting support
Backplane Bus Communication Velocity and Firmware Flash Compatibility
GE Mark VI VCMI modules maintain deterministic backplane bus communication velocity to synchronize I/O scanning, controller messaging, and IONet packet distribution. The IS200VCMIH2BE operates as the VME‑bus master, broadcasting deterministic packets to all remote racks. Downstream VCMI boards extract assigned data from each broadcast frame.
The board contains no programmable flash; firmware resides in the controller. This ensures passive, stable communication routing and prevents firmware mismatch faults during module replacement.
Frequently Asked Questions
Q: Can the IS200VCMIH2BE be removed while the rack is energized? A: No. The rack must be de‑energized to avoid undefined VME‑bus states and IONet communication faults.
Q: Is the IS200VCMIH2BE backwards‑compatible with earlier revisions? A: Yes. The first two functional revisions are backwards‑compatible.
Q: Does the board perform SIFT voting? A: Yes. In TMR systems, SIFT (software‑implemented fault tolerance) voting is executed at the controller level using data routed through the VCMI.
Field Installation Guidelines
Power down the Mark VI rack before inserting or removing the board.
Seat the board evenly to avoid stressing backplane connectors.
Ensure all fiber‑optic IONet cables are fully seated and routed away from high‑energy conductors.
Verify LED indicators during commissioning for communication status.
Maintain proper grounding and cabinet alignment per GE installation manuals.
