Where the IS200DSPXH1DBC Fits in a Mark VI / EX2100 Installation

The IS200DSPXH1DBC carries the DSPX functional code, GE's designation for the Digital Signal Processor Control Board used in the EX2100 static excitation system (and, on the drive side, in GE's Innovation Series product line). Maintenance teams searching for this part number are almost always working on the exciter, not the turbine's own triple-redundant control racks: the DSPX's job is running the bridge and motor regulator functions plus generator field control inside the exciter, and it plugs into the exciter's own VME-style rack through a 128-pin, 4-row DIN backplane connector. Because EX2100 excitation and Mark VI turbine control are sold and installed as a matched pair on most gas and steam turbine-generators, this board is cataloged with the rest of the Mark VI IS200 lineup even though its actual home is the excitation cabinet.

The processing core is a digital signal processor running at 60 MHz, backed by an application-specific integrated circuit (ASIC) for the custom logic and interface functions the DSP itself doesn't handle. Memory is purpose-built: FLASH stores the boot loader, application code, configuration parameters, and system history; RAM handles active data and code execution; NVRAM retains nonvolatile data; and a separate add-only memory block records the board's own revision. On the communications side, two 5 Mb/s ISBus ports (configurable as master or slave) and two independent TTL serial ports — one for a configuration tool, one for a programming board — handle everything from setup to runtime data exchange. The faceplate is fitted with STATUS and FAULT LEDs and DSP emulator / Engineering monitor connectors, and it's deliberately free of field-adjustable components: no fuses, no trimpots, no user test points.

Before You Replace It: What Else Could Be Wrong

A DSPX alarm is the start of the investigation, not the end of it. Before ordering a replacement board, check the following:

• Is the fault isolated to one channel? Multi-channel excitation regulators run several DSPX cards in parallel for redundancy — if the other channels are clean, look hard at configuration and firmware version before condemning the hardware.
• Is the card fully seated in its backplane slot, and is the exciter's power supply board delivering clean rails? A loose 128-pin connector or a marginal supply can produce fault indications that look exactly like a bad processor card.
• Could this be a communications fault rather than a board fault? Problems on the link between DSPX channels can surface as a DSPX alarm even when the card itself checks out.
• Has the replacement card actually been commissioned? A new DSPX arrives without your application code or configuration loaded — that has to be pushed in through the tool port and the Control System Toolbox before the board will run correctly.

If the fault persists on this specific card after all of the above, it's a legitimate hardware failure and the board should be replaced.

Decoding IS200DSPXH1DBC

GE's IS200 part numbers break into three parts: the IS200 platform prefix, the four-letter function code (DSPX), and a suffix identifying group and revision — here, H1DBC, where H1 is the group/generation marker and DBC is the specific revision code. Always quote and order the complete string, IS200DSPXH1DBC, rather than just the functional code; GE revisions under the same group are not automatically interchangeable. See our GE Speedtronic Part Number Decoder for a full breakdown of how these strings are built.

Related Boards

In the EX2100 rack, the DSPX shares backplane space with the exciter's main I/O board, its power supply, and the interface card that links multiple DSPX channels. Teams also supporting legacy Mark IV/Mark V hardware should note that GE's numbering moved from DS200-prefixed boards to the IS200-prefixed boards found on Mark VI and EX2100 systems — our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article cover that history. Browse our full GE Mark VI IS200 Boards collection or the broader GE Speedtronic Turbine Control Boards collection for other positions you may need.

What to Send Us for a Fast, Accurate Quote

• Full part number with suffix: IS200DSPXH1DBC
• Revision letter/number from the physical label
• A photo of the ID label
• Turbine or exciter model and unit number
• Urgency: planned outage or unplanned trip
• Quantity

Request a Quote

This IS200DSPXH1DBC is listed in used condition, cleaned and tested, and comes with a 1-year warranty (see table below). As a lead-generation parts source, we don't list prices online — submit a Request a Quote and you'll hear back within 24 hours with availability and pricing. We ship worldwide DDP, accept POs, and support both scheduled outages and emergency turnarounds.

General Information about the Product
Part Number	IS200DSPXH1D Mark VI IS200
Description	GE General Electric IS200DSPXH1D IS200DSPXH1DBC Printed Circuit Board Mark VI
Condition	used Cleaned and Tested. With 1 Year Warranty.