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Key Technical Specifications
- Function: Power adapter/distribution FTA for the LLMUX (Low Level Multiplexer), SDI (Serial Device Interface), and SI (Serial Interface) subsystems on Honeywell TDC 3000 racks
- Assembly Number: 51309204-175 (rev D1 confirmed in field units; -125 variant also documented)
- Mounting: Rack-mount FTA, installs alongside other TDC 3000 field termination cards in the I/O cabinet
- Interface Role: Distributes power to downstream LLMUX/SDI/SI termination points — it is not itself a signal-processing or CPU card
- System Compatibility: Honeywell TDC 3000 distributed control system I/O racks
- Related Family Parts: MC-TAMT03, MC-TAIH02, MC-PLAM02, MC-HPFX02, MC-TDPR02, MC-TDOR12 (other LLMUX/analog/digital FTAs in the same rack family — confirm you’re ordering the correct variant for your I/O type)
❗ Note: This is legacy, discontinued Honeywell DCS hardware. Detailed electrical parameters (input/output voltage rating, current draw, operating temperature range) are not published in open manufacturer documentation for this specific FTA at this time. Do not rely on generic TDC 3000 family specs as a substitute — pull the exact rating off the card’s nameplate or your system’s I/O manual before ordering, and confirm rev-level compatibility with your rack (D1 vs. other revisions can differ).
Product Introduction
The Honeywell MC-TLPA02 (assembly 51309204-175) is a power adapter Field Termination Assembly built for the LLMUX/SDI/SI subsystem on a TDC 3000 distributed control system rack. It sits in the I/O cabinet and handles power distribution to the downstream low-level multiplexer, serial device interface, and serial interface terminations — it’s a support card, not a signal or CPU module.
This is legacy TDC 3000 hardware, and Honeywell isn’t producing new units. Buyers are working from surplus and refurbished stock, which makes rev-level accuracy (D1 vs. other revisions) and honest condition grading the deciding factors over anything else on the page.
Troubleshooting Quick Reference
| Symptom | Possible Cause | Relevance to this Part | Quick Check Method | Recommendation |
|---|---|---|---|---|
| No power to LLMUX/SDI/SI termination points | Adapter card failure, or upstream rack power loss | ✅ High | Measure rack input power first, then check output at the MC-TLPA02 terminals | If rack power is confirmed good and downstream terminals show no output, the adapter card is the likely fault |
| Only some SDI/SI points dead, others fine | Field wiring or termination point issue, not the adapter | ❌ Low | Check status at adjacent termination points and field wiring | Localized dropouts point to wiring or the individual termination, not this power adapter |
| Intermittent power flicker across the rack | Loose backplane connection, not a card fault | ❌ Low | Reseat the card, check backplane connector pins for corrosion | Common on older TDC 3000 racks — check the connection before assuming the card failed |
| Card runs hot / visible discoloration | Component degradation from age, or overload downstream | ✅ High | Visual inspection for scorch marks, bulging capacitors | Replace — a card showing physical stress signs is a safety-relevant failure, not a wear item to monitor |
| System flags LLMUX comm fault, no obvious power issue | Fault upstream at the multiplexer or SI card, not the power adapter | ❌ Low | Check LLMUX/SI diagnostic status independently of power adapter status | Communication faults are usually a separate card in the rack — don’t swap the power adapter as a first guess |
If you’re still stuck, contact technical support with photos of the card’s nameplate (confirm the exact rev letter), the rack wiring, and any diagnostic log — on TDC 3000-era gear, the rev level matters more than usual for getting the right replacement.
MC-TLPA02
MC-TLPA02
Frequently Asked Questions (FAQ)
Is the MC-TLPA02 still supported by Honeywell?
No — this is TDC 3000-era hardware and Honeywell has moved on to Experion PKS for current DCS platforms. If you’re maintaining a legacy TDC 3000 rack, this part is still the correct one to source; it’s just coming from surplus/refurb channels rather than factory stock.
Does the rev level matter when I order this?
Yes. Field units have shown up as rev D1 under assembly 51309204-175, and there’s a related -125 assembly variant as well. To be honest, mismatched revs on legacy Honeywell FTAs can cause fit or compatibility headaches — confirm the exact assembly number and rev letter on your existing card’s nameplate before ordering a replacement.
Can I hot-swap this while the rack is powered?
Don’t assume you can. Power adapter FTAs on TDC 3000 racks are generally not designed for hot-swap without risk to the downstream LLMUX/SDI/SI points it feeds. Kill power to the affected rack section first unless your specific system documentation explicitly says otherwise.
Will this fix a comm fault I’m seeing on my LLMUX?
Probably not by itself. This card handles power distribution, not signal or communication processing. A comm fault is more likely tied to the multiplexer or SI card itself — check those first before assuming the power adapter is the problem.
Is this new or refurbished, and why is it priced the way it is?
Condition on this part ranges from used/good-condition surplus to tested refurbished, depending on the seller and lot. Confirm which grade you’re getting before you order — legacy TDC 3000 parts are priced based on scarcity and condition, not a fixed factory list price, since Honeywell isn’t manufacturing new units.
What’s the warranty on a part like this?
Ask the specific seller. Warranty terms on surplus TDC 3000 hardware vary widely — some sellers offer 90-day tested warranties, others sell as-is. There’s no factory warranty available since this is discontinued hardware.
Will it work with my existing TDC 3000 rack, or do I need other parts too?
It should integrate directly if your rack is already configured for LLMUX/SDI/SI termination and your existing card is the same assembly/rev. If you’re troubleshooting a different card type (analog input, digital output, etc.), you’ll want one of the related FTAs like MC-TAMT03 or MC-TDOR12 instead — don’t assume all TDC 3000 FTAs are interchangeable.
