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Description
Technical Specifications
| Parameter Name | Parameter Value |
|---|---|
| Product Model | IS215VCMIH2CB |
| Manufacturer | General Electric (GE Energy / GE Industrial Systems) |
| Product Type | VCMI — VME Bus Master Controller / Communication Interface Board |
| Product Family | GE Speedtronic Mark VI Turbine Control System |
| Board Form Factor | 6U high VME board, 0.787 inches (20 mm) wide |
| Processor | TI TMS320C32 32-bit Digital Signal Processor |
| Memory | Dual-port memory architecture |
| Hardware Version | H2 (three IONet ports — TMR-capable); Class C functional revision; B build level |
| IONet Ports | 3 × IONet 10Base2 Ethernet over BNC (one per R, S, T channel) |
| Serial Port | 1 × RS-232C serial port + D-type plug connector |
| Backplane Interface | VME backplane with two edge connectors + 12-pin vertical connector (J301 for PDM diagnostics) |
| Power Supply | 24 VDC low-voltage VME rack power supply variant |
| Power Bus Monitoring | Internal +5 V, ±12 V, ±15 V, ±28 V; alarm at 3.5% typical, 5.5% for 28 V |
| PDM Diagnostics via J301 | P28A / PCOM external monitor circuits; 2 × differential ±5 V DC analog inputs; P125 V ground fault and over/under voltage; digital inputs |
| Front-Panel Indicators | Run, Fail, Status, Reset pushbutton, 1 / 2 / 4 / 8 LEDs; per-IONet TX / RX / CD |
| TMR Throughput | Up to 9 × 21-slot VME racks at 40 ms cycle time |
| Redundancy Support | Simplex (H1) and Triple Modular Redundant (TMR, H2) architectures |
| PCB Protection | Full conformal chemical coating across the circuit board |
| Weight | Approx. 1 lb (0.45 kg) |
| Country of Origin | United States |
| OEM Reference Manual | GEH-6421 Mark VI System Guide, Vol. I & Vol. II |
Main Features and Advantages
True VME bus master architecture: The IS215VCMIH2CB acts as the authoritative VME bus master within the control and I/O racks, managing the ID assignments for every board installed in the rack and for their associated DIN-type terminal boards. This centralized arbitration ensures deterministic block transfers on the VME backplane, allowing controller and I/O processor boards to exchange data bidirectionally without bus contention — a foundational requirement for the 40 ms control cycle expected in gas and steam turbine serviceap4.com+1.
Reliable and stable TMR communication: The three IONet 10Base2 Ethernet ports of the IS215VCMIH2CB are not replicated for convenience — each one carries a dedicated R, S, or T control channel, giving the Mark VI TMR architecture three fully independent communication paths from the I/O rack back to the triple-redundant control processors. Loss of any single IONet leg is detected and reported through the front-panel TX/RX/CD LEDs and through the controller diagnostics, without disturbing the voting outcome of the other two channelsabb-sis.com.
Comprehensive onboard diagnostics: The IS215VCMIH2CB continuously monitors its internal +5 V, ±12 V, ±15 V, and ±28 V power buses with configurable alarm limits, and additionally ingests diagnostic signals from the Power Distribution Module through J301 — including P125 V ground fault and over/under voltage, two differential ±5 V DC analog inputs, P28A/PCOM external monitor circuits, and discrete digital inputs. This layered diagnostic coverage lets Mark VI engineers pinpoint whether a fault originates on the VCMI board, the rack backplane, or the cabinet power distribution itselfworldofcontrols.com.
Industrial-grade hardware construction: Built in the United States around a TI TMS320C32 DSP with dual-port memory and more than fifty integrated circuits — including a filtered oscillator chip using inductive beads to suppress high-frequency noise — the IS215VCMIH2CB carries a full conformal coating across the PCB to protect the circuitry against moisture, dust, and corrosive cabinet atmospheres. The 6U × 0.787 in form factor and ~1 lb weight make the board mechanically compatible with all standard Mark VI control and I/O rackschnscs.com.
Class C functional revision: The “C” revision designation of the IS215VCMIH2CB indicates the Class C functional product version — the highest-revision configuration of the H2 VCMI hardware, incorporating updated component revisions and firmware-level refinements relative to earlier H1 and H2A builds while preserving full physical and electrical compatibility within the Mark VI H2 rack familyabb-sis.com.
OEM-documented compatibility: The IS215VCMIH2CB is fully documented in the GEH-6421 Mark VI System Guide, Vols. I and II, which governs VCMI replacement procedure, firmware download, IONet configuration, and rack ID assignment. Procurement of the board through verified spares channels ensures that a replacement IS215VCMIH2CB drops into the rack without custom engineeringiqelectro.com.
Application Field
The GE IS215VCMIH2CB is deployed in every GE Speedtronic Mark VI installation where VME-based communication between control processors and I/O racks is required. In gas turbine service, the IS215VCMIH2CB sits inside the control module of Frame 3, 5, 6B, 6FA, 7B, 7EA, 7FA, and 9E/9FA gas turbines as well as aeroderivative packages — including LM2500, LM6000, and PGT25 — providing the IONet backbone that links the VPRO triple-redundant protection processors, I/O racks, and operator stations into a single voted control architecture.
In steam turbine and combined-cycle plants, the IS215VCMIH2CB serves equally as the communication master inside the Mark VI racks governing steam valves, HP/IP/LP governor control, generator excitation interfacing, and balance-of-plant loops. Refinery and petrochemical operators using Mark VI for compressor-drive and process-heater duty rely on the IS215VCMIH2CB for the same reason: its TMR architecture and conformal-coated industrial-grade construction suit the high-availability, high-noise environments that characterize these facilities.
Beyond rotating machinery, the IS215VCMIH2CB is used in any Mark VI installation requiring remote I/O racks to be linked to the control processors over IONet — fuel-skid controls, lube-oil conditioning units, compressor wash skids, and auxiliary cooling packages. Across all of these applications, the board solves the same core problem: how to bind the VME-based I/O world to the triple-redundant IONet control world with a single, fully diagnostic, OEM-supported interface — a role the IS215VCMIH2CB has fulfilled across the global Mark VI installed base since its introduction during GE Energy’s Mark VI production runabb-sis.com.
