What the IS200DSPXH1AAA Does and Where It Lives

The IS200DSPXH1AAA is a Digital Signal Processor Control Board (DSPX) built by GE as part of the EX2100 static excitation control platform, and the same board family is used across GE's Innovation Series drives, which share the same VME-style card architecture. On excitation duty, the DSPX card is the primary controller for the bridge and motor regulator functions and the generator field control functions of the EX2100 exciter. In practice, this means the DSPX is not a turbine sequencing card sitting inside the Mark VI <R>/<S>/<T> control racks — it lives in the exciter's own card rack, connecting to the backplane through a 128-pin, 4-row DIN connector. Because GE's static excitation systems (EX2100/EX2100e) are almost always paired with Mark VI or Mark VIe turbine control on the same generator set, the DSPX is catalogued and stocked alongside Mark VI IS200 boards, which is exactly where most maintenance teams go looking for it.

On the board itself, a digital signal processor running at 60 MHz works alongside an application-specific integrated circuit (ASIC) that handles custom logic, timing, and interface functions. FLASH memory holds the boot loader, application code, configuration parameters, and system history; RAM handles working data and code execution; NVRAM stores nonvolatile data; and a separate add-only memory area stores the board's revision identity. Two 5 Mb/s ISBus interfaces (master or slave) plus dedicated TTL serial ports for a configuration tool and a programming board round out the communication side. On the faceplate, look for the STATUS and FAULT LEDs plus the DSP emulator and Engineering monitor connectors — the adjacent test port is reserved for factory development, not field diagnostics.

Diagnose Before You Order a Replacement

A DSPX fault indication rarely means the board itself has failed — before committing to a replacement, work through this checklist:

• Check the redundant channel first. Excitation regulators of this type commonly run multiple DSPX cards across separate channels for redundancy. If only one channel flags a fault while the others read clean, compare configurations before assuming a hardware failure — a stale configuration or firmware mismatch can mimic a card fault.
• Rule out the backplane and power supply. The DSPX draws power and communicates through its 128-pin backplane connector. A partially seated card, a bent pin, or a sagging rail from the exciter's power supply board can reproduce the same STATUS/FAULT LED pattern as a dead processor. Reseat the card and confirm supply voltages before swapping hardware.
• Confirm it isn't a communications problem. Faults on the link between the DSPX and the rest of the exciter can present as a DSPX alarm even when the processor card itself is healthy.
• Remember the board must be re-commissioned, not just plugged in. Application code loads through the exciter's tool port, and configuration parameters load through the Control System Toolbox. A freshly installed DSPX that hasn't been reloaded with the correct application code and configuration will fault in a way that looks exactly like a bad part.

If you've worked through this list and the fault still tracks with the card, you're likely looking at a genuine DSPX failure.

Reading the IS200DSPXH1AAA Part Number

GE's IS200 numbering follows a consistent pattern: the IS200 prefix identifies the hardware generation, the four-letter code (DSPX) identifies the board's function, and the characters that follow — here, H1AAA — identify the grouping and revision. On this board, H1 is the group/generation designator, and the trailing AAA marks the specific hardware and artwork revision. Suffix differences on IS200 boards are usually revision and compatibility markers rather than different products, but GE does not guarantee every revision is a drop-in replacement for every other, so treat the full string IS200DSPXH1AAA as the part number to match — not just "DSPX." For a broader walkthrough of how GE builds these part numbers, see our GE Speedtronic Part Number Decoder.

Related Boards and Cross-Generation Notes

Inside the EX2100 rack, the DSPX works alongside the exciter's main I/O board, its power supply board, and the interface board that ties multiple DSPX channels together. If you're also tracking down older equipment, GE's part numbering moved from the DS200-prefixed boards used on Mark IV/Mark V systems to the IS200-prefixed boards used on Mark VI/EX2100 platforms — our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article walk through that transition. Browse the rest of the family in our GE Mark VI IS200 Boards collection, or the wider GE Speedtronic Turbine Control Boards collection if you're sourcing multiple positions for a planned outage.

What to Include in Your Quote Request

• Full part number including suffix (IS200DSPXH1AAA), not just "DSPX"
• Board revision, if visible on the label
• A clear photo of the board's ID label
• Turbine/exciter model and unit ID
• Whether this is for a planned outage or an urgent unplanned need
• Quantity required

Request a Quote

This IS200DSPXH1AAA is listed in used condition, cleaned and tested, and backed by a 1-year warranty (see details below). We don't publish pricing online — every order is quoted directly. Submit a Request a Quote and our team will respond within 24 hours with availability and pricing. Alo Tech Parts ships worldwide on a DDP basis, accepts purchase orders, and supports both planned outages and urgent unplanned needs.

General Information about the Product
Part Number	IS200DSPXH1A Mark VI IS200
Description	GE General Electric IS200DSPXH1A IS200DSPXH1AAA Digital Signal Processor Board
Condition	used Clean and Tested. With 1 Year Warranty.