IS415UCVHH1A | General Electric | VME Control Board

Description

The GE IS415UCVHH1A is a 6U VME‑based controller board used in the Mark VIe turbine‑control platform. As the UCVH single‑board computer (SBC), it executes turbine‑application code, manages real‑time control tasks, and interfaces with operator stations, engineering workstations, and distributed control systems through multiple communication ports. The board runs the QNX real‑time operating system, ensuring deterministic, high‑speed, multitasking performance required in gas, steam, LM, and balance‑of‑plant applications.

Hardware Specifications

• Part Number: IS415UCVHH1A

• Brand: GE

• Series: Mark VIe

• Product Type: Controller Board

• Number of Channels: 6

• Power Supply: 200–250 VAC

• Operating Temperature: 0 to 70 °C

• Operating System: QNX

• Microprocessor: Intel Ultra‑Low‑Voltage Celeron 650 MHz

• Memory: 128 MB SDRAM

• Weight: 2.00 lbs

• Size: 3.4 in × 6.37 in

• Country of Origin: USA

• Availability: In stock

• Manual: GEH‑6421 M

Functional Description

• Operates as the main controller in Mark VIe VME‑rack control modules.

• Executes turbine‑application code for gas, steam, LM, and BOP systems.

• Connects to turbine I/O boards through the VME backplane.

• Uses QNX, a deterministic real‑time OS optimized for industrial reliability.

• Provides three communication interfaces:

  • Ethernet to UDH for HMI and control‑equipment communication

  • RS‑232C COM1 for setup

  • RS‑232C COM2 for DCS communication

Operation

• Capable of executing up to 100,000 rungs/blocks per second under typical application loads.

• Synchronizes to the VCMI communication board clock within 100 microseconds using an external clock interrupt.

• VCMI exchanges external data with the controller via the VME bus, populating the Control System Database (CSDB).

• Simplex systems: CSDB contains process inputs/outputs from I/O boards.

• TMR systems: CSDB includes:

  • Inputs from all input boards

  • Singular inputs from simplex boards

  • Computed outputs for hardware voting

  • Internal state values exchanged among controllers

Installation

• A complete control module consists of one UCVH controller and one VCMI board.

• Three rack types may be used:

  • GE Fanuc integrator rack (short, remote I/O only)

  • Short Mark VIe rack (local + remote I/O)

  • Long Mark VIe rack (expanded local + remote I/O)

• Cooling fan placement depends on rack type (above or below controller).

• VDSK board required in standalone GE Fanuc rack installations to:

  • Provide fan power

  • Supply rack‑ID connection

Frequently Asked Questions (FAQ)

• Q: Does the IS415UCVHH1A support hot‑swap installation? A: No. The VME rack must be powered down before installing or removing the controller.

• Q: Can the controller operate without a VCMI board? A: No. VCMI is required for VME bus communication and CSDB data exchange.

• Q: Is QNX mandatory for Mark VIe controllers? A: Yes. QNX is the standard real‑time OS for all Mark VIe control modules.

Field Installation Guidelines

• Maintain ESD protection during handling; CPU and memory components are sensitive.

• Ensure correct seating in the VME rack to maintain backplane continuity.

• Verify Ethernet and RS‑232C connections before powering the system.

• Confirm cooling‑fan operation after installation, especially in high‑temperature environments.

• Check rack type to determine whether a VDSK board is required.

• Validate synchronization with VCMI after commissioning.