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3502E

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The Invensys Triconex 3502E is a 32-point Triple Modular Redundant (TMR) 24 VAC/VDC digital input module designed for process safety applications. Operating across three isolated input channels.
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Technical specifications for 3502E

  • Manufacturer:
    Invensys
  • Part Number:
    3502E
  • Product Family:
    Triconex
  • Product Type:
    TMR Digital Input Module
  • Stock:
    1
  • Module Type:
    TMR with Self-Test
  • Nominal Voltage:
    24 VAC/VDC
  • Voltage Range:
    20-42.5 VAC/VDC (DC or 47-63 Hz)
  • Maximum Voltage:
    42.5 VAC/VDC
  • Points:
    32 (Commoned in groups of 8)
  • On to Off Switching Level:
    > 18 VAC/VDC (Guaranteed transition level)
  • On to Off Switching Level:
    < 6 VAC/VDC (Guaranteed transition level)
  • Nominal Turn-On Current:
    6-9 mA
  • Typical Hysteresis:
    4 VAC/VDC
  • Input Delay:
    OFF to ON < 8 ms / ON to OFF < 15 ms
  • Point Isolation:
    1,500 VDC
  • Nominal Input Impedance:
    > 1.25 kΩ
  • Nominal Field Power Load:
    0.5 W per ON point (1.5 W max at field voltage)
  • Diagnostic Indicators:
    Input Status (1 LED per point), Module Status (PASS, FAULT, ACTIVE)
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    USA
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Applications Communication & Connectivity Environment Certifications & Standards

Features:

  • 32 discrete digital input points commoned in groups of 8.
  • Integrated hardware switch mechanism for automated stuck-On failure diagnostic testing.
  • 100% triplicated signal conditioning pathways across three physically isolated channel buses.
Standard order configuration supplies the Triconex 3502E digital input module built with triple modular redundancy for critical logic processing.

This digital input processing board operates within Tricon main or expansion chassis backplanes to evaluate field contact states for safety instrumented systems.

Installation requires selecting an appropriate external termination panel with compatible interface cabling, ensuring mechanical slot keying matches the 24 VAC/VDC TMR profile prior to chassis insertion.

The Invensys Triconex 3502E module is guaranteed to be fully functional, fully tested, and refurbished by the manufacturer (OEM).
Invensys Triconex 3502E Digital Input Module Manuals, Datasheets, Link Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • Emergency shutdown systems (ESD) monitoring discrete field contact inputs.
  • Burner management systems (BMS) for industrial boiler and burner safety trip logic.
  • Turbomachinery control systems requiring fault-tolerant trip signal detection.
  • Transmits triplicated field input status across internal backplane I/O bus directly to Main Processors.
  • Connects to External Termination Panels (ETP) via dedicated multi-conductor backplane interface cables.
  • Communicates module diagnostic data and channel fault flags directly to Tricon system status memory.
  • Designed to operate reliably within industrial control cabinet environmental temperatures.
  • Protects internal circuitry against non-condensing relative humidity conditions inside enclosures.
  • Conformal coated variant withstands harsh chemical and airborne environmental contamination.
  • Certified for use in SIL 1 through SIL 3 safety instrumented systems (SIS) applications.
  • Conformal coated variant (3502EC) meets official equipment qualifications for harsh marine environments.
  • Complies with strict Triconex hardware quality and environmental testing specifications.
Description
Invensys Triconex 3502E 24 VAC/VDC Digital Input Module receives discrete signals from field switches and transmitters to support emergency shutdown (ESD), burner management systems (BMS), and turbomachinery control applications. Operating across 32 points commoned in groups of eight, it processes field input data through three isolated channels to execute triplicated voting logic before executing critical system safety actions.

Built for maximum fault tolerance, the Triconex 3502E features an integrated self-test switch that periodically tests optical isolation circuits to detect dangerous stuck-On conditions in de-energize-to-trip safety loops. The module provides 1,500 VDC galvanic isolation to shield sensitive control electronics from external noise and voltage surges, while internal diagnostic indicators immediately alert operators to channel faults.

Designed for high-availability process plants, the 3502E supports full hot-spare insertion and mechanical slot keying, allowing maintenance engineers to perform online module replacement without interrupting live industrial operations. Available with optional conformal coating (3502EC), it provides robust long-term reliability in harsh petrochemical, oil and gas, and power generation environments.
Alternative Names
3502-E 3502 E 3502e 3502-e 3502EC 3502E 24V DI Module 3502E TMR Digital Input Module Triconex 3502E Digital Input Module 24 VAC/VDC
Technical notes
The Triconex 3502E features an integrated self-test switch that momentarily injects a zero-input signal to detect stuck-On conditions in de-energize-to-trip safety systems.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
How does the Triconex 3502E prevent installation into an incorrect backplane slot?
The Triconex 3502E features mechanical keying on the module housing that physically prevents it from being inserted into an incompatible chassis slot.
Which Triconex controller chassis models are compatible with the Triconex 3502E digital input module?
The Triconex 3502E module is fully compatible with Tricon v9 to v10 systems, including the Main Chassis, Expansion Chassis, and Remote Extender Modules (RXM) Chassis.
What external termination panel (ETP) and cabling are required to install the Triconex 3502E?
The Triconex 3502E requires a dedicated External Termination Panel (ETP) and a compatible interface cable to connect field wiring to the chassis backplane.
Can the Triconex 3502E be replaced online without shutting down the system?
Yes, the Triconex 3502E supports full hot-swap and hot-spare capabilities, allowing live replacement without interrupting running process control loops.
What is the difference between the standard Triconex 3502E and the conformal-coated Triconex 3502EC?
The Triconex 3502EC includes a conformal coating layer for enhanced protection against humidity, moisture, and corrosive atmospheric contaminants, while maintaining identical electrical specifications to the standard Triconex 3502E.
How do I obtain a commercial quotation or official price estimate for the Triconex 3502E?
You can contact us with the required quantity to obtain a formal quote, check current stock, or inquire about lead times for the Triconex 3502E.