Woodward 5500-577 Original Control Module – In Stock, Tested and Ready to Ship

The 5500-577​ is a Woodward 5500-series chassis module supplied and described here in its original, as-manufactured form — not a refurbished clone, not a re-labelled equivalent and not a generic “compatible” card. Woodward’s 5500 numbering sits inside the MicroNet / NetCon control ecosystem, where the modules are board-level assets rather than boxed instruments: they plug into a specific slot on a motherboard, draw their identity from that slot and from the partner hardware at the far end of the link, and carry no user-accessible calibration that would let a substitute be tuned into place. That is the whole reason a plant specifies the 5500-577​ by the original Woodward catalog number instead of reaching for a modern replacement. When the turbine is on control, the application code, the firmware revision and the chassis backplane were all qualified together; changing any one of those variables is a re-commissioning event, not a spare-part swap.What the 5500-577​ does inside the rack depends on the exact variant, and this is where the listing has to stay honest. The 5500 family covers processor, memory, communication and interface functions, and Woodward never distilled the 5500-577 into a public, standalone datasheet. A responsible description therefore states the architectural role — a slot-populated MicroNet module that either hosts, moves or conditions data for the controller and its remote I/O — rather than inventing a channel count, a voltage or a protocol the part does not actually have. If your drawing calls the 5500-577​ a specific function, that drawing is the authority; our job is to make sure the unit on your bench matches it pin for pin, label for label, revision for revision.The commercial case for the 5500-577​ is availability. These are legacy parts, and “in stock” is not a marketing adjective here — it is the difference between a scheduled outage and an unplanned trip. An original unit on the shelf means no redesign of the panel schedule, no firmware migration, no new type-test paperwork and no argument with the turbine insurer about whether the replacement was qualified. We hold the 5500-577​ as a critical-spare line item: labelled by machine and chassis, bagged anti-static, inspected before dispatch and kept separate from the refurb pool so you know exactly what you are opening when the alarm hits.