What IS200BPPBH1APR3 Actually Does

"Analog I/O Processor Board" is the common trade name for the BPPB family, but the more precise description — the one that matters when you're troubleshooting — is that the IS200BPPBH1APR3 is a backplane power and processor interface board. It distributes regulated +5 VDC and ±15 VDC rails to the VME rack modules it serves, stepped down from a nominal +28 VDC input, and it manages the processor-to-I/O data pathway across the rack backplane. It is not a standalone card with its own faceplate in the Mark VI rack; it's a small daughterboard that mounts inside a larger I/O pack (GE uses the BPPB across several pack types, including Core Analog I/O and servo/protection packs), attached via four standoffs into brass-plated corner holes on the host pack's motherboard. In a TMR configuration, three of these processor assemblies — one per R/S/T channel — execute the turbine application software that moves data between the pack and the rest of the VME rack.

Physically, it's a compact board with three shaped edges to clear components on its host motherboard, two LEDs along one edge, two connectors of different sizes, two phone-style jacks, an inductor coil, a mix of capacitor types, several integrated circuits and transistors, and a memory chip mounted near the board's center. It runs across a wide operating temperature range and typically includes an onboard temperature sensor for condition monitoring. Because it's a sub-assembly rather than a field-facing terminal board, it has no direct connection to plant wiring — everything it does happens on the backplane side of the rack.

Diagnose Before You Order a Replacement

Because the BPPB sits inside the I/O pack rather than at the field-wiring interface, it gets blamed for problems it didn't cause more often than most boards in this catalog. Before ordering:

• Check whether more than one pack is affected. If several I/O packs in the same rack section show power or communication alarms at the same time, look at the +28 VDC supply and its distribution first — that pattern points to shared power, not several simultaneous processor-board failures.
• Rule out the field side. The BPPB doesn't see your transmitters, RTDs, or other field devices directly — that signal path runs through the pack's analog front end and the terminal board it's wired to. A bad sensor or a wiring fault upstream can look like a pack fault without the BPPB being at fault at all.
• Check backplane and cable seating. A loose connection between the I/O pack and the rack backplane, or between the pack and its terminal board, can reproduce the same alarm pattern as a failed processor board.
• Confirm which sub-board actually failed. Since the BPPB is one of at least two boards inside its host pack, a fault attributed to "the pack" isn't automatically a BPPB fault — it can take a physical inspection to confirm.

If the fault is isolated to a single pack, with clean power and good field wiring confirmed, replacing the BPPB is the right next step.

Reading the IS200BPPBH1APR3 Part Number

IS200 is the platform prefix, BPPB is the four-letter function code, and H1APR3 identifies the group and revision — H1A for the group/generation and PR3 for the specific revision. Order the complete string, not just "BPPB," since GE's later BPPB revisions (and the BPPC-based packs that eventually superseded this design) are not confirmed to be drop-in equivalents. Our GE Speedtronic Part Number Decoder explains how to work through a full IS200 string when you're checking a label against your spares list.

Related Boards and Compatible Packs

The BPPB has shipped inside several different Mark VI I/O pack types over the years, including Core Analog I/O and servo/protection packs, which is why you'll see it listed under a few different descriptive names depending on the host pack. Later Mark VIe systems moved to a BPPC-based processor design for new I/O packs, so if you're standardizing spares across a mixed Mark VI/Mark VIe fleet, don't assume the two generations are interchangeable without checking firmware and hardware compatibility. If you're also tracking older Mark IV/Mark V hardware, see our Mark V vs Mark VI: DS200 to IS200 guide and GE Mark V DS200 Boards Explained article. Browse the rest of the family in our GE Mark VI IS200 Boards collection or the wider GE Speedtronic Turbine Control Boards collection.

What to Include in Your Quote Request

• Full part number with suffix: IS200BPPBH1APR3
• The host I/O pack part number it's installed in, if known
• Photo of the board or pack ID label
• Turbine/generator model and unit ID
• Planned outage or urgent/unplanned need
• Quantity required

Request a Quote

This IS200BPPBH1APR3 is listed in used condition, cleaned and tested, with a 1-year warranty (see table below). We quote every order directly instead of publishing prices online — submit a Request a Quote and expect a reply within 24 hours. We ship worldwide DDP, accept purchase orders, and support both planned outages and urgent breakdown needs.

General Information about the Product
Part Number	IS200BPPBH1A Mark VI IS200
Description	IS200BPPBH1A By General Electric IS200BPPBH1APR3 Analog I/O Processor Board
Condition	used Cleaned and Tested. With 1 Year Warranty