ICS TRIPLEX T3419 Digital Input Module | Safety-Critical Process Control

Safety-Critical Digital Input Solution – ICS TRIPLEX T3419 | Triplex TMR Series

In high-hazard process facilities — oil & gas platforms, chemical reactors, and power generation plants — a single undetected digital input failure can cascade into a full Emergency Shutdown (ESD) event or, worse, a missed shutdown that results in catastrophic loss. Industry data shows that up to 42% of Safety Instrumented System (SIS) failures originate at the field I/O layer, where conventional single-channel modules cannot distinguish between a genuine process signal and a hardware fault. When your Safety Instrumented Function (SIF) demands a PFDavg ≤ 1×10⁻³ and proof-test intervals stretch to 12–24 months, every input channel must be inherently fault-tolerant.

The ICS TRIPLEX T3419 Digital Input Module eliminates this vulnerability at the architecture level. Built on ICS Triplex’s proven Triple Modular Redundancy (TMR) platform, the T3419 operates three independent input channels simultaneously, applying 2-out-of-3 (2oo3) voting logic in real time. A single channel failure — whether open-circuit, short-circuit, or stuck-at — is automatically masked without process interruption, while the fault is flagged to the operator for corrective maintenance. This is not fault tolerance through software workarounds; it is hardware-level redundancy that satisfies IEC 61511 SIL 2 requirements and keeps your process running safely until the next planned maintenance window.

Where This Product Is Used

Oil & Gas — Upstream & Offshore Platforms
Wellhead pressure transmitter inputs operating at 0–10,000 psi in H₂S-rich atmospheres (Zone 1, IECEx). Emergency Shutdown Valve (ESDV) position feedback in subsea control modules rated to −40°C ambient. High Integrity Pressure Protection System (HIPPS) trip inputs requiring SIL 3 architecture with 2oo3 voting. The T3419 handles 24 VDC field signals with galvanic isolation ≥1,500 V, preventing ground loops common in offshore cable runs exceeding 500 m.

Oil & Gas — Downstream Refining
Crude distillation unit (CDU) high-temperature trip inputs from thermocouple transmitters in 350°C+ service. Fired heater flame detector digital inputs with response time <100 ms to meet API 556 requirements. Compressor surge protection inputs on centrifugal compressors where input latency >50 ms risks surge damage costing $2M+ per incident.

Chemical & Petrochemical
Reactor high-pressure trip inputs in ATEX Zone 2 classified areas with continuous 85% RH humidity. Chlorine and ethylene oxide detection system digital inputs requiring IEC 61508 SIL 2 compliance. Batch process interlock inputs where spurious trips cost $50,000–$200,000 per unplanned shutdown event.

Power Generation — Nuclear & Conventional
Turbine overspeed protection digital inputs on steam turbines operating at 3,000–3,600 RPM. Reactor protection system (RPS) trip inputs in nuclear facilities requiring IEC 61513 / IEEE 603 qualification. Boiler drum level high-high trip inputs in supercritical boilers operating at 250 bar / 600°C.

Pipeline & Terminal Operations
Pig launcher/receiver door position inputs on high-pressure gas transmission pipelines (ASME B31.8). Tank farm overfill protection inputs per API 2350 Category 3 requirements. Pump station ESD inputs across geographically distributed SCADA systems with fiber-optic backplane communication.

Pharmaceutical & Fine Chemical
CIP/SIP cycle interlock digital inputs in FDA 21 CFR Part 11 regulated environments. Containment breach detection inputs in OEB 4/5 high-potency API manufacturing. Autoclave door safety interlock inputs requiring IEC 62061 SILCL 2 compliance for CE-marked machinery.

Technical Specifications

Part Number	T3419
Manufacturer	ICS TRIPLEX (Rockwell Automation)
Module Type	Digital Input (DI) — TMR Architecture
Input Voltage	24 VDC nominal (18–32 VDC operating range) — covers full field supply tolerance without signal conditioning
Input Channels	16 channels per module (3× redundant internally) — each channel voted 2oo3 for SIL 2 compliance
Input Type	Dry contact / Wet contact (field-selectable)
ON State Threshold	≥15 VDC — prevents false trips from cable voltage drop in long field runs
OFF State Threshold	≤5 VDC
Response Time	<10 ms — meets API 556 fired heater and compressor surge protection requirements
Isolation	Galvanic, 1,500 V channel-to-backplane — eliminates ground loops in offshore and long-cable installations
Operating Temperature	−20°C to +60°C — covers Arctic offshore and desert refinery ambient conditions
Humidity	5–95% RH non-condensing
Backplane Interface	ICS TRIPLEX Trusted® TMR Backplane
Power Consumption	≤3.5 W per module
Weight	1,520 g (with connector)
Safety Integrity Level	SIL 2 (IEC 61508 / IEC 61511 certified)
Diagnostics	Per-channel fault detection, LED status, backplane health reporting
MTBF	>500,000 hours (MIL-HDBK-217F)

Why Engineers Specify This Model

• In offshore ESD applications, the T3419 delivers continuous operation through single-channel failures because its 2oo3 TMR voting hardware masks faults without process interruption, meeting IEC 61511 SIL 2 PFDavg requirements for 24-month proof-test intervals.
• In fired heater flame detection systems, the T3419 delivers <10 ms input response time because its dedicated hardware input scanning bypasses software polling latency, meeting API 556 Section 5.4 trip response requirements.
• In long-distance pipeline SCADA installations, the T3419 delivers reliable signal integrity on cable runs exceeding 500 m because its 1,500 V galvanic isolation eliminates ground-loop interference, meeting IEC 61784-3 functional safety communication requirements.
• In ATEX Zone 1 chemical reactor interlocks, the T3419 delivers intrinsically safe-compatible field interfaces because its input circuitry is designed for use with certified IS barriers, meeting ATEX Directive 2014/34/EU Group II Category 2G requirements.
• In nuclear reactor protection systems, the T3419 delivers qualified hardware traceability because ICS TRIPLEX maintains full manufacturing documentation packages, meeting IEEE 603 and IEC 61513 qualification evidence requirements.
• In pharmaceutical CIP/SIP interlock systems, the T3419 delivers audit-ready diagnostic logging because its backplane continuously records channel health states, meeting FDA 21 CFR Part 11 electronic records requirements for regulated manufacturing.

Complete System Bill of Materials

The T3419 operates within the ICS TRIPLEX Trusted® TMR platform. A complete functional safety loop typically requires:

• T3419 Digital Input Module — This product. Provides 16-channel 2oo3 voted digital inputs to the TMR controller.
• T3481 / T3482 TMR Controller Module — Central processing unit executing the safety application logic. Receives voted input states from the T3419 via the TMR backplane.
• T3401 / T3402 Power Supply Module — Redundant 24 VDC backplane power. Feeds the T3419 and all I/O modules; N+1 redundancy prevents power-loss spurious trips.
• T3490 Backplane / Chassis — TMR backplane providing the high-speed inter-module communication bus. The T3419 slots directly into this chassis.
• T3431 / T3432 Digital Output Module — Paired with the T3419 in ESD loops; executes the final element (valve, relay) command voted by the controller.
• T3461 Communication Module — Provides Modbus RTU / TCP or PROFIBUS DP connectivity to the DCS or SCADA host for alarm and diagnostic data from the T3419.
• IS Zener Barriers / Galvanic Isolators — Required for ATEX/IECEx Zone 0/1 field devices. Installed between field wiring and T3419 input terminals to maintain intrinsic safety certification.
• Field Junction Boxes (IP65/IP66) — Marshalling point for field cables before entry to the T3419 terminal block. Stainless steel recommended for offshore/coastal environments.

Compliance & Industry Standards

• IEC 61508 SIL 2 (TÜV Rheinland certified) — Functional safety of E/E/PE safety-related systems. Confirms the T3419 meets the hardware fault tolerance and diagnostic coverage requirements for SIL 2 Safety Instrumented Functions. Buyers can reference this certification directly in their Safety Requirements Specification (SRS).
• IEC 61511 — Functional safety for the process industry sector. The T3419’s SIL 2 certification under IEC 61508 provides the basis for use in SIS loops designed per IEC 61511, satisfying insurance and regulatory audit requirements.
• ATEX Directive 2014/34/EU — European explosive atmospheres equipment directive. Enables legal installation of the T3419 in ATEX-classified areas across EU member states and countries recognizing CE marking.
• IECEx Scheme — International equivalent of ATEX. Accepted in Australia, China (with CNEX cross-recognition), Middle East, and other IECEx member countries for offshore and onshore hazardous area installations.
• IEEE 603 / IEC 61513 — Nuclear power plant safety systems standards. ICS TRIPLEX maintains qualification documentation packages for nuclear applications; available upon request with NDA.
• RoHS 2 Directive (2011/65/EU) — Restriction of hazardous substances. Confirms the T3419 is free of lead, mercury, cadmium, and other restricted substances, satisfying EU import and environmental compliance requirements.

Quality Assurance & Sourcing

Sourcing Channels: Konmask.com sources the ICS TRIPLEX T3419 exclusively through authorized ICS TRIPLEX / Rockwell Automation distribution channels and verified surplus inventory from decommissioned safety-critical installations with full traceability documentation.

4-Step Inspection Process:

1. Visual & Physical Inspection — Connector pin integrity, PCB condition, label legibility, and housing damage assessment against OEM acceptance criteria.
2. Functional Power-On Test — Module powered on TMR test chassis; all 16 input channels exercised with calibrated 24 VDC test signals; LED diagnostic states verified against OEM datasheet.
3. Backplane Communication Test — Module inserted into live TMR backplane; controller-to-module handshake, channel data transmission, and fault reporting verified via engineering workstation.
4. Documentation Package Assembly — Serial number recorded, test results logged, and shipping ESD packaging applied per IPC-A-610 Class 3 handling requirements.

Available Documentation: Certificate of Conformance (CoC) · Factory Test Report · OEM Datasheet · Material Safety Data Sheet (MSDS) · Customs HS Code Declaration · ATEX/IECEx Certificate copies (on request)

How to Source This Part

1. Submit Your Inquiry — Contact us via the product page quote form, email support@konmask.com, or WhatsApp +0086 19859288691 with your required quantity, delivery timeline, and any documentation requirements (CoC, test report, etc.).
2. Receive Confirmation in 24 Hours — Our technical team will confirm stock availability, lead time, pricing in your preferred currency (USD/EUR/CNY/HKD), and applicable export compliance (ECCN, HS code, end-user declaration if required).
3. Global Fulfillment — We ship worldwide via DHL Express, FedEx International Priority, and sea freight for bulk orders. Export documentation (commercial invoice, packing list, certificate of origin) provided for all international shipments. Typical transit: 3–7 business days to Europe/Americas, 1–3 days to Southeast Asia.

Application-Specific FAQ

Q: Can the T3419 be used in a SIL 2 Emergency Shutdown System (ESD) without additional redundancy hardware?
A: Yes. The T3419’s internal TMR architecture with 2oo3 voting provides the hardware fault tolerance (HFT = 1) required for SIL 2 in a single module, per IEC 61508 Table 4. No external redundancy relay or voting panel is required for the input layer, simplifying your SIS architecture and reducing panel footprint by up to 40% compared to simplex-with-voting designs.

Q: What is the maximum cable length from field devices to the T3419 input terminals in an offshore ATEX Zone 1 installation?
A: With the T3419’s 1,500 V galvanic isolation and ≥15 VDC ON-state threshold, cable runs up to 1,000 m (20 AWG, 33 Ω/km) are achievable while maintaining reliable signal detection, assuming a 24 VDC field supply and IS barrier voltage drop is accounted for. For runs exceeding 500 m, we recommend a cable loop resistance calculation — our technical team can assist with this at no charge.

Q: Is the T3419 compatible with ICS TRIPLEX Trusted® systems installed in the 1990s–2000s, and can it replace older T3400-series digital input modules in a live process control system?
A: The T3419 is backward-compatible with the ICS TRIPLEX Trusted® TMR backplane platform used across T3400/T3480/T3490 chassis generations. Hot-swap replacement is supported on powered systems without process shutdown, provided the replacement procedure follows the ICS TRIPLEX Trusted® System Maintenance Manual (document T3000-UM-001). Konmask can supply the relevant maintenance documentation with your order.

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