Description
Key Technical Specifications
| Parameter | Value / Note |
|---|---|
| Manufacturer | Honeywell |
| Part Number | 51305896-200 |
| Description | PWA, NIM Modem EC |
| Product Family | Honeywell TDC 3000 / TPS |
| Module Role | NIM modem PWA / communication board |
| System Function | Supports NIM communication between LCN and UCN |
| Mounting | NIM chassis / card-cage assembly |
| Condition | Typically surplus, removed, or refurbished |
| Documentation | Confirm against TDC 3000/TPS NIM hardware manuals |
| Interchangeability | Must match installed NIM revision and system build |
Product Introduction
In a TDC 3000 or TPS cabinet, the NIM is one of those modules you do not replace by guesswork. It sits between the Local Control Network and the Universal Control Network, and a wrong PWA revision can keep the NIM from coming online even if the board appears physically identical.
The Honeywell 51305896-200 is listed as a “PWA, NIM Modem EC,” meaning it is a modem/communication printed wiring assembly used within a TDC 3000/TPS NIM. It is not a generic power supply or standalone controller. For procurement, treat it as a legacy NIM communication PWA. The safe replacement path is to match the failed board’s full label, revision code, and NIM assembly number before releasing the order.
HONEYWELL 51305896-200 NIM MODEM
QA/QC Transparency SOP
- Intake & Origin Verification — Record 51305896-200, revision, serial number, NIM assembly P/N, cabinet tag, and slot position. Reject units with burnt components, damaged edge connectors, or missing EC/revision markings.
- Visual & Connector Inspection — Check the PWA for corrosion, lifted traces, damaged modem/communication connectors, and backplane contact wear.
- Live Functional Testing — Install the PWA into a verified NIM test assembly. Check power-up, modem/communication status indicators, and LCN/UCN link behavior where test infrastructure allows.
- Electrical Parameter Tests — Measure supply rails, connector continuity, insulation resistance, and signal integrity on communication interfaces. Flag abnormal power draw or intermittent contact.
- Final QC & Anti-Static Packaging — Label with full part number and revision, protect connectors, apply ESD packaging, and include a test summary for the receiving engineer.
Field Engineer Gotchas
- This is a PWA, not necessarily a full NIM. Ordering 51305896-200 as a complete NIM replacement can cause confusion. Confirm whether the site needs the full NIM assembly or only the modem PWA.
- Revision matching is critical. TDC 3000/TPS NIM hardware often has EC/revision-dependent compatibility. A board that powers up may still fail network initialization if the revision does not match the cabinet build.
- Do not confuse it with a power supply. Some third-party listings describe it broadly as a power or communication module, but the part description “PWA, NIM Modem EC” points to a modem/communication board inside the NIM.
- LCN/UCN mapping must be preserved. NIM replacements require correct network address, redundancy pairing, and slot configuration. Swapping boards without verifying NIM identity can disrupt LCN communications.
- Follow cabinet procedures. NIM work in TDC 3000/TPS systems should follow site change control, backup, and redundancy procedures. Do not remove modules from an operating NIM without authorization.
HONEYWELL 51305896-200 NIM MODEM
Application Scenarios
- Replacing a failed modem PWA inside a TDC 3000/TPS NIM where the NIM assembly is otherwise serviceable.
- Supporting a legacy TDC 3000 cabinet that still bridges LCN and UCN networks in a refinery or chemical plant.
- Maintaining an aging TPS system where OEM NIM spares are no longer readily available.
- Keeping a legacy DCS online during a phased migration to Honeywell Experion or another modern platform.
FAQ
Is 51305896-200 a complete NIM?
No. It is listed as a “PWA, NIM Modem EC,” which indicates a modem/communication board inside the NIM, not necessarily the full NIM assembly.
What system does it belong to?
Honeywell TDC 3000 / TPS, where the NIM connects the LCN and UCN networks.
Can I substitute it with another NIM modem PWA?
Only if the part number, revision, and assembly compatibility are confirmed. NIM hardware is not universally interchangeable.
Is it still sold new by Honeywell?
Treat it as a discontinued/legacy spare. Most available stock is surplus, removed, or refurbished.
What information should I send before ordering?
Full label photo, revision/EC code, NIM assembly part number, cabinet tag, slot position, and the failed board’s serial number.
Does it support hot-swap?
Do not assume hot-swap capability for NIM internal PWAs. Follow site procedures and Honeywell maintenance guidance before removing or inserting boards.
