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Technical specifications for 2551
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Manufacturer:Invensys
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Product Category:DCS Systems
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Spare Part Number:2551
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Estimated shipping dimensions:49x45.3x6.8cm
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Weight:3.75 kg
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Tariff Code:8537101190
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Counliy of origin:USA
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Product form:Tricon RETMA-rail termination panel set
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Signal role:Digital-input field termination
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Documented suffixes:2551-1, 2551-6, 2551-8
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2551-1 arrangement:115 VAC/VDC, non-commoned
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2551-6 arrangement:115 VAC/VDC, commoned
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2551-8 arrangement:Commoned and redundant; confirm revision-specific voltage marking
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Matched module family:3501E/F/T
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Interface-cable family:4000214-1xx
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Low-density panel numbers:3000110-110 / -160 / -180 by suffix
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Interface cables:Two required per ETP
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Service function:Field wiring can remain landed during approved I/O-module replacement
Information
Overview
Manuals
Common Applications
Product Precautions
The Invensys Triconex 2551 family provides an electrically passive field-wiring interface between approved digital-input circuits and a matched Tricon input module. Manufacturer records distinguish three suffix variants with different commoning arrangements.
- Passive external termination-panel architecture
- 2551-1, 2551-6 and 2551-8 suffix variants
- Matched 3501E/F/T digital-input module family
- Two approved interface cables required per ETP
The 2551 termination family sits between field wiring and the approved Tricon digital-input module. Its purpose is to organize the field interface while allowing an I/O module to be removed or replaced without disturbing the landed field wiring.
A base marking of 2551 is not enough to select the electrical arrangement. Record the complete suffix, commoning design, cable family, panel part number and cabinet drawing before procurement, installation or replacement.
Important Notice: Confirm the complete 2551 suffix, 3501 module revision, interface-cable part number and cabinet wiring record before installation or replacement.
Invensys Triconex 2551 Manuals & Downloads
Invensys Triconex 2551 Technical Reference (PDF)Invensys Triconex 2551 Installation & Commissioning Guide (PDF)
These two documents are different: the first consolidates exact family data and suffix boundaries; the second provides controlled installation, replacement, commissioning and acceptance checks.
Legacy Tricon input cabinetsPreserve a documented digital-input field termination in an approved low-density Tricon architecture.
Controlled module replacementKeep landed field wiring stable while an approved matched input module is serviced.
Cabinet wiring restorationRebuild the exact suffix, cable and panel relationship from the approved drawing and installed labels.
Lifecycle support planningIdentify obsolete hardware precisely before sourcing a compatible service replacement or migration path.
For Invensys Triconex 2551, verify the complete suffix, approved input-module hardware, field-voltage arrangement and cabinet records before work.
1Record the complete 2551 suffix and every visible panel identifier.
2Apply the approved safe-work procedure and isolate field energy.
3Verify the 3501E/F/T module revision against the cabinet drawing.
4Match commoned, non-commoned or redundant wiring to the exact suffix.
5Confirm the 4000214-1xx cable and low-density panel part number.
6Inspect both required interface cables and connectors before use.
7Check field labels, terminal continuity and grounding before energization.
8Document the as-left wiring and acceptance results before release.
Technical notes
Manufacturer guides identify 2551-1 as non-commoned and 2551-6 as commoned. The -8 variant is redundant/commoned, but legacy manufacturer records differ on its voltage wording, so the installed label and revision-specific field-termination guide control the final wiring decision.
FAQ View All FAQ
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What is Invensys Triconex 2551?It is the base identifier for a legacy RETMA-rail digital-input termination-panel family; the complete suffix defines the exact arrangement.
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Which suffixes are documented for Invensys Triconex 2551?Manufacturer records list 2551-1, 2551-6 and 2551-8.
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How do Invensys Triconex 2551-1 and 2551-6 differ?2551-1 is documented as non-commoned, while 2551-6 is documented as commoned.
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What distinguishes Invensys Triconex 2551-8?It is the redundant, commoned family member; confirm its revision-specific voltage wording from the installed label and applicable guide.
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Which input modules are associated with Invensys Triconex 2551?The field-termination guide associates the 2551 variants with the 3501E/F/T digital-input module family.
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Which interface cable family is listed for Invensys Triconex 2551?The guide lists 4000214-1xx, with the exact cable and panel part selected by suffix.
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How many interface cables does an Invensys Triconex 2551 ETP use?The compatibility table states that two interface cables are required per ETP.
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Why must the full Invensys Triconex 2551 marking be recorded?The base number alone does not resolve commoning, redundancy or the exact panel part, and manufacturer records differ on one legacy voltage description.
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