Description

The ALSTOM DSI1817(TRVC062335000/CP00003934)is a digital input terminal interface module designed for the Alstom T3000/TXP distributed control system.It serves as the physical and electrical bridge between field devices(e.g.,pressure switches,limit switches,relay contacts)and the central DSI(Digital Signal Input)processing card in the T3000 rack.The unit typically includes a pluggable terminal block base,screw terminals for field wiring,and mechanical/electrical keying to ensure compatibility with specific DSI input modules.

Although Alstom no longer manufactures this part(declared obsolete post-2015),it remains critical in thousands of operational power plants worldwide.The CP00003934 suffix often denotes a specific revision or terminal configuration,while TRVC062335000 is Alstom’s internal manufacturing or drawing code.

Key Technical Characteristics

Parameter Value/Description

System Compatibility Alstom T3000/TXP DCS(pre-GE integration)

Function Digital Input(DI)terminal interface/carrier base

Channels Typically supports 8,16,or 32 inputs(depends on mounted DSI card)

Input Type Dry contact or 24–48VDC wetted contact(configurable)

Terminal Type Screw-clamp,1.5–2.5 mm²wire range

Isolation Reinforced insulation between field and logic sides(>500 V AC)

Mounting DIN rail or backplane-mounted within T3000 I/O chassis

Hot-Swap Supported in redundant T3000 configurations

Operating Temp 0°C to+60°C(industrial grade)

Status Indication LED visibility through cutouts(channel/activity)

Legacy Status Obsolete(No Longer Manufactured–NLM);last shipment~2018

Application Scenarios

At a 600 MW coal-fired plant in Poland,the boiler protection system relies on over 200 DSI1817 terminal bases to monitor flame scanners,drum level switches,and fan status.During a recent outage,a technician discovered corrosion on a feedwater low-level switch circuit.Thanks to the modular design of the DSI1817,the faulty terminal pair was isolated and re-terminated without disturbing adjacent safety signals—keeping the rest of the boiler interlock active.Although new units are unavailable,the plant maintains a strategic spare inventory sourced from certified surplus channels.Meanwhile,engineers are planning a phased migration to ABB System 800xA,using gateway solutions to retain existing field wiring while replacing T3000 controllers.

Migration&Obsolescence Management

Due to obsolescence,many operators face three paths:

Life Extension:Source tested,refurbished DSI1817 units with traceable provenance.

Emulation:Use third-party I/O emulators that mimic T3000 electrical interfaces.

Full DCS Migration:Replace T3000 with modern platforms(e.g.,GE Mark VIe,ABB 800xA,or Siemens SPPA-T3000 successor).ABB,in particular,offers T3000-to-800xA conversion services,including wiring harness reuse to minimize downtime.

⚠️Caution:Counterfeit or untested DSI1817 modules have appeared in gray markets.Always verify firmware compatibility,mechanical fit,and dielectric strength before installation.

Related Components

DSI1816:Analog input terminal variant

DSO1820:Digital output counterpart

T3000 CPU Module(e.g.,CP00001234):Central controller

Alstom Terminal Cover(TRVCxxxxx):Protective snap-on lid

ABB TB5xx Series:Potential replacement terminal bases during migration

GE UR6AH:Functional equivalent in Mark VIe systems(for digital I/O)

Support&Availability

We supply refurbished,functionally tested ALSTOM DSI1817 TRVC062335000 CP00003934 units that undergo:

✅Visual&mechanical inspection

✅Continuity and isolation testing

✅Compatibility verification with known T3000 revisions

✅Conformance labeling and batch traceability

Each unit comes with a 12-month warranty and technical datasheets.We also offer obsolescence consulting,including cross-reference reports and migration planning support for T3000 users.

🔧Note:If you’re managing a T3000 system,now is the time to audit your spares inventory.Lead times for verified legacy modules are increasing due to global demand from aging power infrastructure.

Contact us for immediate availability,pricing,or a free obsolescence risk assessment.Keep your plant running—safely and reliably—even when the OEM has moved on.

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