Function first: the processor behind four IO cores

This listing covers a new-surplus, factory-packaged DS200UCPBG6A — the 486-class processor daughterboard a GE Speedtronic Mark V LM uses to run each of its IO Engines. GE's platform manual, GEH-6153, defines the part in a sentence: a daughterboard on the DS200STCA Turbine Communication Board, carrying the IO Engine's 80486DX processor, acting as the IO "switchboard" between the Control Engine and the I/O cards. Four of them serve a complete panel — one per IO Engine, <R1> through <R3> plus <R5> — which is exactly why operators of LM-package turbines like to keep at least one on the shelf.

The data path it manages is the COREBUS, the internal ARCNET network of the Mark V LM. On a 10 ms frame cycle, each IO Engine transmits its packaged analog and digital values to the Control Engine's database and picks up the output packet coming back. Lose one UCPB and you have not lost a channel; you have lost an entire core's worth of I/O until the board is replaced.

A fit check before you commit

New surplus deserves the same diagnostic discipline as any other purchase, because the fastest way to waste a good board is to install it into a fault that was never the processor. Confirm the failure is genuinely core-wide — all of one IO Engine's values stale, communication diagnostics against that engine — rather than a single bad channel, which points to an analog or digital I/O board instead. Verify the TCPS supply in the same rack, since a dead supply and a dead CPU look identical from the operator screens. Inspect the COREBUS drop and its connectors. Then reboot the core once by its power switch and watch the MON_SYS COREBUS status page from the HMI. If the engine still will not join, the daughterboard is a rational buy.

Factory packaging, firmware, and configuration

Two layers of "software" matter when a UCPB is swapped. The IO configuration — the data that tells the engine what its I/O boards are and how to scale them — is not something you lose with the old board: GEH-6153 notes that each IO Engine receives its configuration from the Control Engine at every reboot, so a correctly addressed replacement picks up the site configuration on start. The board-resident layer is different. The UCPB carries its BIOS and code in flash EPROM, and GE's general replacement guidance for the platform is to match hardware settings to the outgoing board — the COREBUS address DIP switches especially, plus the board's small set of jumpers (supplier documentation lists JP1 and JP3 as factory-test jumpers and JP2 as the 486 local bus speed selector). Factory packaging means this board arrives as GE shipped it; tell us your panel's vintage and the full number of the board coming out, and we will confirm the match before anything leaves the shelf.

Part number anatomy

Reading DS200UCPBG6AFB against GE's own decode: DS for the Salem, Virginia operation; 200 for a base-level board (215 denotes a higher-level assembly with added PROM or firmware); UCPB the functional acronym; G6 the group; A a non-backward-compatible functional revision that completes the catalog number DS200UCPBG6A; FB the backward-compatible revision tail. Groups are hard boundaries — G6 is not a later G5, and neither is an H-group — while tail letters generally are not. The scheme, including where suffixes do and do not matter, is explained in our GE Speedtronic Part Number Decoder and in GE Mark V DS200 Boards Explained.

Sending the RFQ

1. Full part number with suffix, ideally from the label of the board being replaced.
2. A label photo — thirty seconds that prevents most ordering errors.
3. Turbine package and control platform (Mark V LM; or heavy-duty Mark V, Simplex or TMR).
4. Whether you need a single board or a set, and any companion boards — STCA, TCQA, TCPS — while the panel is open.
5. Required delivery: emergency, outage window, or stock replenishment.

Worldwide delivery

Condition for this unit is new surplus in original factory packaging with a one-year warranty, per the table below. Use Request a Quote and our team replies within 24 hours with availability and lead time. We deliver worldwide under DDP terms and accept purchase orders. The rest of the platform's board families are gathered in GE Mark V DS200 Boards.