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        • Lifecycle status

          Active / Available from OEM
          Apter Power supports 3501E quotation, termination review, and documentation checks.

        3501E

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Triconex 3501E is a 32-point, non-commoned 115 VAC/VDC TMR digital input module with isolated channels, voted input data and hot-spare support.
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        Ships by Thursday, October 29
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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.
        Shipping Mode
        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
        We have been working hard to update our inventory. If we have stock or parts available for new factory purchases, you can contact the order online. If we do not currently have an inventory, the displayed quantity will show "Ask". Please create an online quote or contact us by phone, fax or email to check availability.

        Technical specifications for 3501E

        • Manufacturer:
          Invensys
        • Part Number:
          3501E
        • Product Family:
          Triconex
        • Product Type:
          TMR Digital Input Module
        • Stock:
          1
        • Model:
          3501E
        • Architecture:
          TMR digital input
        • Nominal voltage:
          115 VAC/VDC
        • Input points:
          32 non-commoned, isolated
        • Input range:
          90 to 155 VAC/VDC
        • Frequency range:
          DC or 47 to 63 Hz
        • Maximum input voltage:
          155 VAC/VDC
        • Off-to-On guaranteed level:
          At or above 86 VAC/VDC
        • On-to-Off guaranteed level:
          At or below 28 VAC/VDC
        • Nominal turn-on current:
          6 to 9 mA
        • Typical hysteresis:
          32 VAC/VDC
        • Off-to-On delay:
          Less than 8 ms
        • On-to-Off delay:
          Less than 15 ms
        • Point isolation:
          1,500 VDC
        • Nominal input impedance:
          Greater than 8.5 kΩ
        • Field load per On point:
          1.5 W nominal
        • Field load at maximum voltage:
          2.9 W
        • Point indicators:
          One input-status indicator per point
        • Module indicators:
          PASS, FAULT, ACTIVE
        • Stuck-On self-test:
          Not provided
        • Color code:
          Red
        • Hot spare:
          Supported
        • Tariff Code:
          8537101190
        • 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 Input Architecture Diagnostics Compatibility

        Features:

        • Accepts thirty-two non-commoned, isolated 115 VAC/VDC digital input points.
        • Triplicates signal processing and votes the input data before the application uses each state.
        • Supports a hot-spare module through the documented external termination arrangement.
        The current ordering configuration is 3501E, the 115 VAC/VDC member of the Tricon 32-point TMR digital-input family.

        It acquires isolated field contact or voltage states and transfers triplicated channel data for processor voting in safety and critical-control applications.

        Before commissioning, confirm the 90–155 V field range, external termination panel, point isolation, cable assembly and hot-spare slot definition.

        Availability is subject to Apter Power inventory and sourcing confirmation.
        Verified resources for Triconex 3501E: 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.
        • Receives isolated 115 VAC or VDC status signals from field switches and auxiliary contacts.
        • Provides high-integrity discrete feedback for shutdown permissives, interlocks and protective sequences.
        • Supports maintenance strategies that reserve an adjacent configured position for online hot-spare replacement.
        • Thirty-two non-commoned input points are processed through three independent TMR channels before the Main Processors vote the field data.
        • The module accepts 90 to 155 V AC or DC, with AC operation specified across the 47 to 63 Hz frequency range.
        • Guaranteed switching boundaries are defined above 86 V for Off-to-On and below 28 V for On-to-Off transitions.
        • Ongoing channel diagnostics drive the module FAULT indication and the chassis alarm when an internal test detects an abnormal condition.
        • The TMR architecture tolerates a single channel fault, but this model does not include the stuck-input test used by 3502E, 3503E and 3505E.
        • Individual point indicators show input state, while PASS, FAULT and ACTIVE indicators separate module health from field status.
        • The 3501E provides 1,500 VDC point isolation, while the related 3501T configuration is specified at 2,500 VDC.
        • Approved termination choices include the documented 9561-series panels and the matching Tricon cable interface for the selected wiring arrangement.
        • Hot-spare use requires the correct companion chassis position, mechanical keying and identical field information at both module connections.
        Description
        Triconex 3501E is a 32-point, non-commoned TMR digital input module for 115 V AC or DC field signals. Three independent input channels condition and scan each field state before the Main Processors vote the resulting data for use by the safety application. Individual returns preserve point separation, while the module presents high-voltage contact and status information without combining those circuits into a shared field common.

        Optical isolation separates the incoming circuits from the Tricon controller, and point indicators show the reported state independently of PASS, FAULT and ACTIVE health information. Continuous internal diagnostics monitor the three processing paths so a single channel fault can be identified while the voted input remains available. This model does not provide the stuck-input test used by several lower-voltage TMR input modules, which is an important diagnostic distinction during specification review.

        Service planning must match the E-version isolation rating, the approved external termination panel, the interface cable and the mechanical keying assigned to the chassis position. A configured hot-spare location can support online maintenance, but it still requires identical field information and compatible termination. Before replacement, verify the AC or DC source, switching thresholds, field-return arrangement and project documentation rather than assuming that every 3501-family suffix has the same isolation or qualification scope.
        Alternative Names
        3501E Triconex 3501E Invensys Triconex 3501E 3501 E 3501-E Triconex Model 3501E Triconex 3501E 115V TMR Digital Input Module
        Technical notes
        3501E does not provide the stuck-On self-test used by several lower-voltage models; confirm the safety analysis and test strategy before substitution.
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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
        Why are the 3501E field points described as non-commoned?
        Each input is isolated rather than arranged in shared groups of eight, which affects termination and fault-current paths.
        Which Tricon input-test limitation is unique to 3501E in this table?
        Unlike 3502E, 3503E and 3505E, the 3501E specification does not include the stuck-On self-test.
        Where does 3501E fit in a shutdown system?
        It acquires isolated 115 VAC/VDC permissive and status signals that require TMR processing and processor voting.
        How can maintenance teams plan 3501E availability?
        Apter Power confirms exact model, condition, test evidence, external termination needs and delivery window before quotation.
        What prevents a lower-voltage Tricon DI from replacing 3501E directly?
        Voltage range, point commoning, impedance, color keying, termination and diagnostic behavior differ between family members.
        Which installation records should accompany a 3501E inquiry?
        Provide the chassis and slot, ETP and cable numbers, field voltage, AC frequency if used, hot-spare plan and clear module labels.

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