IS215UCVDH1A: E-Net, ISBUS and Genius on One Controller

The IS215UCVDH1A (extended IS215UCVDH1AF) is a General Electric Mark VI Speedtronic main controller from the UCVx family's "D" generation, configured — as its label indicates — with Ethernet (E-Net), two ISBUS drive-LAN interfaces and one Genius I/O connection. It is a VME-based controller that mounts in the Mark VI control module's VME rack and runs the turbine application code, communicating with the turbine I/O across the VME bus. This build's mix of interfaces makes the faceplate the quickest way to identify it on the rack.

The controller's place in the Mark VI VME rack

The UCVD reaches the I/O network through the VCMI communication interface, exchanging process data with the control system database (CSDB) over the VME bus and synchronizing with the VCMI to within about ±100 microseconds. Its own faceplate connections — the Ethernet link for the operator/HMI network (UDH), the two ISBUS drive-LAN ports and the Genius connection — give it direct paths to drives and I/O beyond the VME backplane. The controller runs the QNX real-time operating system (confirmed across independent references) and executes analog and discrete control blocks. The processor and memory content of the UCVD vary from build to build, so we do not state a fixed clock or memory size; the board label is the reference.

Before You Buy: Confirm the Controller Is the Fault

A controller with a busy faceplate has many external dependencies, and any of them can imitate a board failure. Diagnose first:

• Read the two LED banks. One shows controller and communication status; the other displays runtime error codes from download, configuration or startup — record them before acting.
• Check the ISBUS and Genius links. A drive-LAN or Genius network problem, or a fault in a connected drive, can present as a controller fault. Verify the buses and their devices.
• Test the VCMI/IONet path. If the controller cannot reach the I/O through the VCMI, it looks dead even when healthy.
• Inspect rack power and card seating. Intermittent, controller-like symptoms often trace to a marginal supply or a poorly seated board.
• Separate firmware/configuration from hardware. A ControlST/firmware mismatch or a failed application download is fixed in software, not by a new controller.

Only after the buses, VCMI, power and configuration check out is the H1A the right board to replace.

What the H1A / H1AF suffix denotes

The number breaks into blocks: IS215 for the Mark VI assembly family and GE lineage, UCVD for the D-generation VME controller, and H1A (extended H1AF) for the specific hardware build and revision. In the UCVD range the dash-number tracks the faceplate/I/O configuration — which is exactly why this build is called out for its E-Net, ISBUS and Genius set — and the trailing letters mark revision. Match the whole string; H1A, H5A and H7A are different builds. Our GE Speedtronic Part Number Decoder explains each field.

Related UCVx controllers and companion cards

The Mark VI main controller spans the UCVB, UCVD, UCVE and UCVG generations; the UCVD and the common UCVE are siblings. It works with the VCMI communication interface and the rest of the Mark VI rack. See the GE Mark VI IS200 Boards collection and the broader GE Speedtronic Turbine Control Boards range for companions and alternates.

Details to send with your quote

• Full part number and suffix (IS215UCVDH1A / H1AF) exactly as labeled.
• A photo of the controller faceplate and label showing the interface set.
• Turbine model, Mark VI generation, and simplex or TMR (<R>/<S>/<T>) architecture.
• ControlST/ToolboxST firmware version if known, quantity, and urgency.

Request a Quote for the H1A Build

This IS215UCVDH1A is offered as cleaned-and-tested used stock with a one-year warranty. Tell us what you need and we will reply with a quote within 24 hours. We ship worldwide DDP and accept purchase orders from qualified organizations. Use Request a Quote and include your faceplate photo so we can match the exact interface configuration.

General Information about the Product
Part Number	IS215UCVDH1A Mark VI IS215
Description	IS215UCVDH1A By General Electric IS215UCVDH1AF E-Net, 2 ISBUS, 1 Genius Module
Condition	used Cleaned and Tested. With 1 Year Warranty.