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        Triconex 3501T
        Triconex 3501T
        Triconex 3501T
        Triconex 3501T
        Triconex 3501T
        Triconex 3501T
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        3501T

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        The 3501T is a Triconex TMR digital input module with 32 non‑commoned, isolated points, 115 VAC/VDC, self‑test for stuck‑ON detection, and 1500 VDC point isolation.
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        Warranty Policy
        We provide 1 year warranty for all remaining parts.
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        Return Notice
        The warranty period is one year from the date of shipment, unless otherwise stated in the parts description. We guarantee that the project will not exhibit functional defects that may occur under normal operating conditions during the warranty period.
        In the event of a defect, we will send new equipment, repair equipment or refund the purchase price based on our availability. You must contact us to obtain a return authorization and return the defective device to us within 14 days of reporting the defect.
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        Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.Various transportation options are available in each country. Shipping methods and fees are clearly indicated on all quotations.
        Parts Availability
        Apter Power offers a wide range of components, products and services related to industrial automation. We also supply new products from a variety of quality manufacturers.
        How to order
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        Technical specifications for 3501T

        • Manufacturer:
          Invensys
        • Part Number:
          3501T
        • Product Family:
          Triconex
        • Product Type:
          Digital Input Module
        • Input Voltage:
          115 VAC / VDC
        • Number of Points:
          32, non‑commoned, isolated
        • AC/DC Range:
          90‑155 VAC / VDC
        • Frequency Range:
          DC or 47‑63 Hz
        • Maximum Voltage:
          155 VAC / VDC
        • Nominal Turn‑On Current:
          6‑9 mA
        • Typical Hysteresis:
          32 VAC/VDC
        • Nominal Input Impedance:
          >8.5 kΩ
        • Weight:
          2.35 kg
        • Estimated shipping dimensions:
          2.2x40.8x39.8cm
        • Tariff Code:
          8537101190
        • 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 Specifications Application Diagnostics & Protection Installation & Upgrade

        Features:

        • Triple Modular Redundancy for safety; dedicated self‑test circuit verifies OFF detection capability, critical for de‑energize‑to‑trip systems.
        • Each input electrically independent; 2500 VDC isolation for 3501T; prevents ground loops; connects devices with different ground potentials.
        • OFF→ON delay <8 ms; ON→OFF delay <15 ms; switching level >86 V (ON) and <28 V (OFF); hysteresis 32 V; nominal turn‑on current 6‑9 mA.
        The 3501T is a Triple Modular Redundancy (TMR) digital input module, meaning it has three independent input channels per point. Each channel processes the signal independently, and the main processors vote on the result before using the data. This architecture ensures that a single fault in one channel does not compromise system integrity. The 3501T also includes a self‑test feature specifically designed to detect stuck‑ON conditions. In a de‑energize‑to‑trip safety system, the ability to detect that an input has turned OFF is critical.

        The 3501T provides 32 input points that are non‑commoned and isolated from each other. This means each input has its own independent return path; the negatives are not tied together internally. Point isolation is rated at 1500 VDC (2500 VDC for the 3501T). This level of isolation is critical when field devices are located on different ground potentials or when long cable runs pick up induced voltages. Without isolation, ground loops can cause false readings or damage the input circuitry.

        The 3501T is designed to reliably detect input signals in industrial environments where voltage levels may vary. It accepts AC or DC voltages from 90 to 155 V, covering nominal 110V, 115V, and 120V systems. The switching thresholds are carefully set: the input turns ON at >86 V and turns OFF at <28 V. This wide hysteresis (32 V) prevents nuisance toggling due to noise or voltage fluctuations. The OFF→ON delay is less than 8 milliseconds, and the ON→OFF delay is less than 15 milliseconds.

        The 3501T Triconex Digital Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL)by the manufacturer (OEM).

        Triconex 3501T Digital Input Module Manuals, Datasheets,Drivers,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.
        Triconex 3501T Digital Input Module Specs

        General

        • Manufacturer Triconex
        • Model 3501T
        • Condition New Original ready stock
        • Product Family 3504E,3511,3664,3008
        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): Captures binary states from high-voltage field pressure switches, safety interlock pushbuttons, and critical process valve limit switches to execute immediate process isolation upon safety breaches.
        • Burner Management Systems (BMS): Monitors heavy-duty 115V utility circuits, blower motor auxiliary contacts, furnace exhaust dampers, and fuel isolation valve limits to enforce critical furnace purge and ignition sequences.
        • Fire and Gas Systems (F&G): Consolidates active high-voltage alerts from traditional, high-power flame monitors and industrial-grade combustible gas sensing switches in hazardous marshaling enclosures.
        • Nuclear Class 1E Safety Automation: Utilized within commercial nuclear power plants for Reactor Protection Systems (RPS), Engineered Safety Features Actuation Systems (ESFAS), and critical control room instrumentation due to Tricon's nuclear qualification.
        • Triple Modular Redundant (TMR) Voting: The module houses three independent channels (A, B, and C).
        • Active Onsite Pulse Diagnostics: Conducts continuous, non-intrusive background microprocessor testing.
        • High-Voltage Galvanic Isolation: Employs optoelectronic isolation rated up to 1500V AC/DC.
        • Granular Fault Notification: The front faceplate features Pass, Fault, and Active LED status indicators.
        • Chassis Slotting: Verify that the mechanical keying pins on the target slot inside the Tricon Main or Expansion Chassis match the 3501T specifications.
        • External Termination Board Assembly: Connect the module's rear interface to the designated External Termination Assembly (ETA) using an approved Triconex multi-conductor system cable.
        • Power Verification: The module draws redundant 24VDC system power automatically via the chassis backplane. Upon insertion, watch the LED initialization sequence. Once the Pass indicator remains solid green and the Active indicator lights up, the module has loaded its runtime map and is actively monitoring the field loops.
        Description
        The 3501T is a Triple Modular Redundant (TMR) digital input module for Triconex safety systems. It has 32 non‑commoned, isolated input points. Each point is rated for 115 VAC or VDC. The module features three isolated input channels per point, with independent signal conditioning and optical isolation. 

        When using the 3501T, engineers benefit from complete, ongoing diagnostics for each channel. The module has a switching level of >86 V for OFF→ON and <28 V for ON→OFF. Nominal turn‑on current is 6‑9 mA. Input delay is <8 ms (OFF→ON) and <15 ms (ON→OFF). 

        The 3501T has point isolation of 1500 VDC (2500 VDC for 3501T). Diagnostic indicators include an input status LED per point and module status LEDs (PASS, FAULT, ACTIVE). The module is mechanically keyed to prevent improper installation. The 3501T has a red color code. 

        For legacy Triconex system expansions, the 3501T is a critical spare part. It is compatible with termination panels: 9561‑810 (commoned), 9561‑110 (non‑commoned), 9551‑110 (basic), and 9141‑010 (ERT loop‑back). The module supports hot‑spare capability. 

        Alternative Names
        35O1T 350IT 3000510-180 3008 3504E 3511 3664 3805E
        Technical notes
        The 3501T is a Triconex TMR digital input module with 32 non‑commoned, isolated points for 115 VAC/VDC. It features self‑test for stuck‑ON detection, 1500 VDC point isolation, and input delay <8 ms (OFF→ON). Switching thresholds are >86 V and <28 V. Nominal turn‑on current is 6‑9 mA. The module has red color code and supports hot‑spare capability.
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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.
        VIEW ALL FAQS
        Does 3501T detect stuck‑ON inputs?
        Yes. The 3501T has a self‑test feature that closes a switch within the input circuitry to read a zero input (OFF) while freezing the last data in the I/O communication processor. This tests for stuck‑ON conditions, critical for de‑energize‑to‑trip safety systems.
        Are the 32 inputs on 3501T isolated from each other?
        Yes. The 3501T has non‑commoned, isolated points with 1500 VDC isolation (2500 VDC for 3501T). Each input is electrically independent, preventing ground loops and allowing connection to devices with different reference potentials.
        What are the switching thresholds for 3501T?
        OFF to ON transition occurs at >86 VAC/VDC. ON to OFF transition occurs at <28 VAC/VDC. Hysteresis is 32 VAC/VDC, preventing chatter. Nominal turn‑on current is 6‑9 mA. For 115 VAC/VDC applications, this ensures reliable detection.
        Which termination panels work with 3501T?
        Compatible panels include 9561‑810 (commoned), 9561‑110 (non‑commoned), 9551‑110 (basic), and 9141‑010 (ERT loop‑back). The module requires a separate external termination panel (ETP) with a cable interface to the Tricon backplane.

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