Description
Product Introduction & Engineering Value
The Woodward 5501-470 is a legacy CPU module used within Woodward control architectures. Available inventory records specifically identify versions such as Rev. D NETCON CPU_040 W/O LL MEMORY, making the revision and memory configuration important when matching a replacement.
This is not a generic PLC processor that can be selected by physical fit alone. Woodward’s own change documentation associates 5501-470 with a range of legacy CPU/application configurations. Before replacement, compare the existing CPU revision, application software, memory configuration, chassis arrangement, and system documentation.
Technical Specifications
- Manufacturer: Woodward
- Part Number: 5501-470
- Hardware Type: CPU module
- Documented Configuration: NETCON CPU_040
- Memory Configuration: W/O LL Memory
- Known Revision: Rev. D
- System Family: NetCon 5000 / legacy MicroNet control architecture
- Primary Role: Central control-system processor
- Installation: Woodward control-system chassis
- Application: Turbine and industrial engine control
- Legacy Status: Manufacturer-discontinued/legacy inventory is reported by suppliers
- Related Woodward Documentation: Product Change Notification 06919
A caution on specifications: several aftermarket listings incorrectly classify 5501-470 as an analog input module, power module, or easYgen controller. Those descriptions conflict with Woodward’s own documentation and other records identifying it as a CPU assembly. For a technical product page, the CPU / NETCON CPU_040 / W/O LL MEMORY identification is the safer documented basis.
Field Application & The “Trench” Experience
A common legacy-control failure occurs during a turbine maintenance outage: the original CPU is no longer reliable, but the plant cannot justify replacing the entire control cabinet. The spare 5501-470 looks like the obvious answer.
The catch is the application image. A CPU replacement is not finished when the module powers up. The technician needs to establish that the replacement hardware revision and memory configuration correspond to the existing application, then restore or verify the correct control software before running the turbine through its startup sequence.
Specific application scenarios include:
- Steam turbine governor control — processing control logic for speed, load, and associated turbine functions.
- Gas turbine auxiliary control — legacy Woodward digital control cabinets where CPU-level processing is required.
- Compressor or generator control — replacement of an obsolete Woodward processor while retaining the existing field I/O architecture.
5501-470
5501-470
Transparency SOP: QA & Testing
For New Surplus 5501-470 stock, the most useful QA record should document the actual hardware rather than simply state “tested.”
- Identity check: Confirm 5501-470 and record the visible revision.
- Hardware inspection: Examine PCB assemblies, connectors, edge contacts, LEDs, mounting hardware, and labels.
- Configuration check: Verify the NETCON CPU_040 / W/O LL MEMORY configuration where marked.
- Power-up test: Confirm normal initialization using an appropriate compatible test environment.
- Communication test: Verify applicable diagnostic/service communication.
- Application test: Where equipment is available, verify CPU operation with a compatible Woodward application.
- Condition report: Clearly classify the unit as New Surplus, Used, or Refurbished.
Some suppliers currently advertise 5501-470 as new/unused inventory, while other listings describe discontinued or refurbished stock. Condition should therefore be confirmed for the actual unit being purchased.
The Veteran’s Tech Trap Guide
⚠️ Trap #1 — Ignoring “W/O LL MEMORY.”
The 5501-470 is documented in a specific CPU_040 without LL memory configuration. Do not assume every 5501-470 listing represents an identical memory arrangement.
⚠️ Trap #2 — Treating Rev. D as interchangeable with every revision.
Revision matters on legacy control hardware. Match the replacement against the installed CPU and the application documentation before commissioning.
PRO TIP: Photograph the old CPU’s complete label before removal. Capture the part number, revision, serial number, and any application/software identification. That record is often more useful than a supplier’s generic product description.
⚠️ Trap #3 — Confusing this part with similarly numbered Woodward hardware.
The web contains conflicting third-party descriptions of 5501-470. Woodward’s own Product Change Notification identifies it as a CPU assembly, so procurement should be based on the manufacturer’s documentation and the installed system BOM.
Dynamic FAQ
What is Woodward 5501-470?
5501-470 is a Woodward CPU module / CPU assembly associated with legacy NetCon and MicroNet control architectures. Woodward documentation lists it as a CPU assembly with application software configurations.
What does “CPU_040 W/O LL MEMORY” mean?
It identifies a particular CPU configuration. CPU_040 is the documented CPU designation, while W/O LL MEMORY indicates that the unit is configured without the specified low-latency memory option.
Is 5501-470 an I/O module?
No. Woodward’s own documentation identifies 5501-470 as a CPU assembly. Some third-party listings contain conflicting descriptions, so the original system BOM and Woodward documentation should take precedence.
What should I verify before ordering a replacement?
Verify the complete 5501-470 part number, hardware revision, memory configuration, installed control-system platform, application software, and chassis position. For a legacy system, also compare the existing CPU’s label with the proposed replacement.
Is New Surplus 5501-470 available?
Supplier inventory can include unused/new units as well as refurbished or discontinued stock. One current supplier listing describes a brand-new 5501-470 with a 12-month supplier warranty. Confirm the actual unit condition and packaging before purchase.
What warranty should I expect?
Warranty is seller-specific. Current listings show examples of 12-month supplier warranties, but this should not be interpreted as an original Woodward factory warranty unless explicitly stated.
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