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3. Key Technical Specifications
| Parameter | Specification Value |
|---|---|
| Catalog Part Number | 2351 |
| Manufacturer | Triconex (Schneider Electric / Invensys) |
| System Compatibility | Tricon High-Density Chassis (v9 / v10 TMR Systems) |
| Number of Inputs | 16 discrete channels (TMR voting per point) |
| Nominal Input Voltage | 24V DC (15 to 30V DC operating range) |
| Input Type | Sinking / Voltage-sensing discrete inputs |
| Internal Architecture | Triple Modular Redundant (3 independent processing legs: A, B, C) |
| Isolation | 1000V DC channel-to-backplane optical isolation |
| Power Dissipation | < 10 W maximum |
| Diagnostics | Continuous internal self-test & automatic fault detection per channel leg |
| Hot Swappable | Yes (supports online replacement without interrupting process) |
4. Product Introduction & Supply Chain Strategy
The Triconex 2351 is a 16-point 24V DC discrete digital input card designed exclusively for Tricon Safety Instrumented Systems (SIS). Operating on a Triple Modular Redundant (TMR) architecture, the 2351 split-routes incoming field sensor signals across three independent input channels (Legs A, B, and C). The internal main processors execute 2-out-of-3 (2oo3) voting logic to eliminate single points of failure and prevent false trips.
This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo complete diagnostic verification to ensure full SIL3 (Safety Integrity Level 3) system readiness.
In critical production environments like offshore platforms, oil refineries, and nuclear plants, a failure in the Emergency Shutdown (ESD) system can force complete plant trips or violate environmental safety mandates. Sourcing verified New Surplus Triconex 2351 modules provides immediate restoration of safety loop redundancy without waiting on extended manufacturer lead times.
2351
5. Installation & Configuration Guide
Safety Instrumented System Precaution
Before replacing or inserting any module into an active Tricon TMR chassis, verify system key-switch position (REMOTE or PROGRAM) and confirm that adjacent module slots are healthy to avoid tripping safety interlocks.
1
Safety System Status Check
Prerequisite
1.Safety System Status Check:Prerequisite.
Verify system diagnostics via TriStation 1131. Confirm that the target slot’s partner module (if running in dual-redundant mode) is active and reporting green health LEDs.
2
Old Module Extraction
Removal
2.Old Module Extraction:Removal.
Slightly loosen the top and bottom module retaining thumbscrews. Pivot the top and bottom module ejector levers outward to disengage the backplane connectors, then slide the card straight out of the chassis guide rails.
3
Inserting New Module
Hardware Setup
3.Inserting New Module:Hardware Setup.
Align the side guides of the Triconex 2351 card with the target slot on the Tricon main or expansion chassis. Slide the card inward until the ejector levers contact the chassis frame.
4
Backplane Engagement
Seating
4.Backplane Engagement:Seating.
Push both ejector levers inward simultaneously until they lock flush with the module front panel. Tighten the top and bottom retaining thumbscrews to secure backplane grounding.
5
TriStation Diagnostic Check
Verification
5.TriStation Diagnostic Check:Verification.
Observe the front panel LEDs: PASS should illuminate solid green, and channel status LEDs should reflect current field switch states. Check the TriStation 1131 diagnostic panel to confirm successful 2oo3 voting synchronization.
6. System Compatibility & Maintenance Notes
The Triconex 2351 functions within high-density Tricon safety racks:
- Programming Environment: Configured and diagnosed using TriStation 1131 Developer workstation software.
- Redundancy Modes: Can be installed in single-slot mode or dual-slot configuration for hot-spare online replacement.
- Terminal Panels: Pairs with standard Tricon External Termination Panels (ETP) via heavy-duty interface cables for field instrument connection.
7. Frequently Asked Questions (FAQ)
Q: Is this Triconex 2351 module brand new or pulled from a decommissioned safety rack?
A: This product is a Brand New Surplus unit. It is not used, not pulled from a decommissioned plant, and not refurbished. All modules undergo diagnostic verification to guarantee SIL3 reliability.
Q: Can I replace the Triconex 2351 module while the safety system is online?
A: Yes. Triconex TMR systems support online hot-swapping. If configured with a paired hot-spare slot, the system automatically transfers input monitoring to the secondary card during replacement without interruption.
Q: What safety integrity level (SIL) does this module support?
A: When integrated into a certified Triconex TMR safety architecture, the 2351 supports up to SIL 3 safety loop applications (IEC 61508 / IEC 61511 compliance).
Q: What warranty is provided with this New Surplus safety card?
A: We supply this module with a full 1-year functional replacement warranty from the date of shipment to ensure complete operational safety for your facility.
