IS215VCMIH2BB: Role in the Control and I/O Racks
The IS215VCMIH2BB is a VCMI (VME Communications Interface) board for the GE Speedtronic Mark VI turbine control platform. It's the bus master for its rack, tracking every board installed there and relaying I/O data to the UCVE processor, while also serving as that rack's only connection to IONet — the network shared with the VPRO protection boards and, on TMR systems, the other two control cores.
Backplane, IONet, and the VCMI's Job
Two separate networks meet at the VCMI. Internally, it talks to every other board in the rack over the VME backplane. Externally, it uses IONet, a 10Base2 coax network, to reach the protection module and, in a triple-redundant system, the VCMI boards on the other two channels. The H2 design puts three IONet ports on one card so a single VCMI can serve all three <R>/<S>/<T> channels where the system is built that way; the H1 design has just one port for simplex use.
Replacing a VCMI generally means powering down its rack, disconnecting the IONet cable from the board while keeping the rest of the loop intact through the T-fitting, swapping the card, then downloading its configuration from Toolbox and cycling power to bring it back online — not something to attempt without reviewing GEH-6421 and confirming with your team first, since a rack power-down affects everything in that rack.
What Else Could Cause These Symptoms
Field experience on this board family shows a VCMI alarm doesn't always mean this card is the problem:
- Corroded or loose IONet BNC connectors and bad terminal resistors are common, cable-side causes of loss-of-communication alarms.
- Alarm logs have been known to reference a fault on this card's IONet segment when the actual failing hardware is a companion VCMI on a different core — check the specific fault code and core designation before ordering.
- GE TIL-1905 documents an oxidized-socket IONet transceiver chip issue on VCMI boards (H1B, H1C, H2B, H2C) manufactured between May 2006 and February 2009.
- RF interference, poor grounding, corrosive atmosphere, and cabinet condensation are all documented, non-board sources of intermittent alarms.
Cleaning and reseating the card, and checking rack power (5V/15V rails), has resolved persistent alarms in documented cases without a board swap.
Matching Your Exact Suffix and Revision
IS215 marks the Mark VI assembly family, VCMI the function, H2 the three-IONet-port TMR design, B the flash-memory generation, and the trailing B the specific revision. The revision is stamped on the card edge and must match your Toolbox configuration — send a photo of your existing board's label and we'll verify before shipping.
Related Mark VI Resources
Our GE Speedtronic Part Number Decoder explains how to read any IS200/IS215 board, and Mark V vs Mark VI: DS200 to IS200 is useful for sites still supporting older Speedtronic generations. See the rest of the lineup in GE Mark VI IS200 Boards.
Details We Need for Your RFQ
- Full part number and suffix, with revision (IS215VCMIH2BB)
- A photo of the label on the board you're replacing
- Turbine model and Mark VI configuration (simplex or TMR)
- Quantity and urgency
Request Your IS215VCMIH2BB Quote
This IS215VCMIH2BB is used, clean and tested, with a 1-year warranty. We quote worldwide with DDP shipping, accept purchase orders, and respond within 24 hours. Click Request a Quote — pricing is never listed here, since every quote is matched to your specific board and timeline.
General Information about the Product |
Part Number |
IS215VCMIH2BB Mark VI IS215 |
Description |
IS215VCMIH2BB By GE IS200VCMIH2BCC VME Communication Interface Board |
Condition |
used Clean and Tested. With 1 Year Warranty. |
