The IS215UCVDH7A Processor Control Board Explained

The IS215UCVDH7A — supplied here in its H7AM build — is a General Electric Mark VI Speedtronic main controller from the UCVx family's "D" generation. Functioning as the processor control board of the turbine control module, it executes the application code that runs the machine. Like the rest of the UCVD line it is a VME-based controller that occupies a slot in the Mark VI VME rack and communicates with the turbine I/O over the VME bus.

How the UCVD runs turbine application code

The controller loads machine-specific application software and executes it as analog and discrete control blocks under the QNX real-time operating system (a detail corroborated by more than one independent reference). It exchanges process data with the control system database (CSDB) through the VCMI communication board across the VME bus and stays clock-aligned with the VCMI to within roughly ±100 microseconds. The front faceplate carries a UDH Ethernet port for the HMI/operator network, serial COM ports (COM1 for setup and diagnostics), and status LEDs. We deliberately do not publish a fixed CPU clock or memory size for the UCVD: those specifications changed across the controller's builds, and the authoritative source is the label on your board.

Rule Out Look-Alike Faults Before You Order

Because the controller sits at the center of the system, many faults elsewhere are mistaken for a failed UCVD. Diagnose before you buy:

• Capture the error LEDs. One LED bank shows controller/communication status; the other shows runtime error codes tied to download, configuration or startup. Those codes usually point at the real cause.
• Test the VCMI and IONet path. A controller cut off from its I/O by a VCMI or network fault behaves like a dead processor even when it is healthy.
• Inspect rack power and seating. Marginal power or an imperfectly seated card in the VME rack causes intermittent faults that imitate hardware failure.
• Check firmware and the application load. A mismatched ControlST/firmware version or an incomplete download is a software problem, not a board problem.
• Reach it over COM1. If you can still communicate with the controller for setup and diagnostics, the board is likely not the failure.

Replace the H7A only after power, VCMI, network and configuration have been cleared.

Reading IS215UCVDH7A / H7AM

The part number decodes cleanly: IS215 is the Mark VI assembly family and GE lineage, UCVD is the D-generation VME controller, and H7A (extended H7AM) is the specific hardware build and revision. In the UCVD range the dash-number corresponds to the controller's faceplate/I/O configuration, while the trailing letters denote revision. An H7A is a distinct build from an H1A or H5A, so match the whole string. See the GE Speedtronic Part Number Decoder for a field-by-field guide.

Cross-generation: UCVD next to UCVB, UCVE, and UCVG

GE built the Mark VI main controller across the UCVB, UCVD, UCVE and UCVG generations. The UCVD and the frequently specified UCVE are siblings, and a rack designed around one generation will expect a matching controller and firmware. Explore the family and its companion VCMI boards in the GE Mark VI IS200 Boards collection or across the wider GE Speedtronic Turbine Control Boards catalog.

Quote request essentials

• Complete part number and suffix (IS215UCVDH7A / H7AM) exactly as printed on the label.
• A clear photo of the controller label and revision.
• Turbine model, Mark VI generation, and simplex or TMR (<R>/<S>/<T>) configuration.
• ControlST/ToolboxST firmware version if known, quantity, and required lead time.

Get a Quote Within 24 Hours

This IS215UCVDH7A is offered as cleaned-and-tested used stock with a one-year warranty. Send your requirement and we will respond with a quote within 24 hours. We ship worldwide DDP and accept purchase orders from qualified organizations. Click Request a Quote and attach your label photo so we can confirm the correct generation and build.

General Information about the Product
Part Number	IS215UCVDH7A Mark VI IS215
Description	GE General Electric IS215UCVDH7AM Processor Control Board Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.