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        • Lifecycle Status

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          Apter Power provides immediate quotations, technical documentation, and sourcing support for Triconex 3505E modules.

        3505E

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        1001 reviews ｜ Need a Specific Revision?
        The Triconex 3505E Digital Input Module is a 32-point 24 VDC Triple Modular Redundant (TMR) input card engineered with a low switching threshold and automatic self-test functionality.
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        Ships by Monday, October 19
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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 3505E

        • Manufacturer:
          Invensys
        • Part Number:
          3505E
        • Product Family:
          Triconex
        • Product Type:
          Low Threshold TMR DI Module
        • Stock:
          1
        • Module Type:
          TMR Digital Input Module, Low Threshold with Self-Test
        • Nominal Input Voltage:
          24 VDC
        • Number of Input Points:
          32 points, commoned in groups of 8
        • DC Input Voltage Range:
          32 points, commoned in groups of 8
        • Maximum Operating Voltage:
          42.5 VDC
        • Switching Levels:
          Off to On: < 12 VDC; On to Off: > 4 VDC
        • Nominal Turn-On Current:
          3 mA to 5 mA
        • Typical Hysteresis:
          2 VDC
        • Input Delay Time:
          OFF to ON < 8 ms; ON to OFF < 15 ms
        • Point Isolation Voltage:
          1,500 VDC
        • Nominal Input Impedance:
          > 1.25 kΩ
        • Field Power Load:
          0.5 watts per On point (1.5 watts at maximum field voltage)
        • Diagnostic Status Indicators:
          PASS, FAULT, ACTIVE; 1 Input Status LED per point
        • Stuck-On Test Feature:
          Supported (On)
        • Color Code:
          Dark Red
        • Weight:
          2.15 kg
        • Estimated shipping dimensions:
          305 x 30 x 267 mm
        • 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 Performance & Efficiency Monitoring & Control Environmental Ratings

        Features:

        • Triple Modular Redundant (TMR) architecture with 32 digital input points grouped into four isolated banks of eight.
        • Low voltage switching threshold operating at 20 to 42.5 VDC, featuring <12 VDC Off-to-On and >4 VDC On-to-Off levels.
        • Automated internal self-test routine for continuous detection of stuck-On field input and circuit failures.
        The Schneider Triconex 3505E is available as a brand-new or fully tested surplus 24 VDC Low Threshold TMR Digital Input Module, supplied in original or protective ESD packaging ready for critical safety system installation.

        Designed for high-integrity Safety Instrumented Systems (SIS), this module conditions incoming discrete signals across three triplicated processing paths to deliver fault-tolerant logic voting for emergency shutdown (ESD) and process safety applications.

        When integrating into a Tricon chassis, ensure proper backplane slot keying alignment, connect exclusively to approved external termination panels (ETP) via system cables, and configure the software I/O definitions prior to online module insertion.
        The Schneider Triconex 3505E TMR DI Module availability and lead times are subject to stock verification by the manufacturer (OEM) or authorized vendor.
        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) requiring low-threshold discrete field switch monitoring.
        • Burner Management Systems (BMS) for critical valve position and flame switch signal verification.
        • Fire and Gas (F&G) detection networks utilizing 24 VDC discrete field transmitters.
        • Delivers high-speed response with input delays under 8 ms for Off-to-On transitions and under 15 ms for On-to-Off transitions.
        • Operates with low field power dissipation of 0.5 watts per active point, reaching a maximum of 1.5 watts at 42.5 VDC.
        • Requires low turn-on current between 3 mA and 5 mA, making it ideal for low-power discrete field contacts.
        • Features front-panel PASS, FAULT, and ACTIVE status indicators for fast visual health checking.
        • Includes 32 individual point status LEDs providing direct real-time visual monitoring of field channel states.
        • Scans field inputs independently via microprocessor channels and transmits voted logic data to Main Processors.
        • Certified for operation in process control environments with an ambient operating temperature rating up to 140°F (60°C).
        • Features optional conformal coating (model suffix C) to protect internal circuit assemblies against corrosive atmospheric environments.
        • Select conformally coated hardware configurations are certified for use in harsh marine operational environments.
        Description
        Schneider Triconex 3505E is a high-reliability 24 VDC Triple Modular Redundant (TMR) Digital Input Module designed to monitor critical discrete field signals in industrial safety instrumented systems (SIS). Featuring 32 input points organized in four isolated groups of eight, the module receives binary field signals from safety switches and pressure transmitters, maintaining a low voltage switching threshold with an Off-to-On level below 12 VDC and On-to-Off level above 4 VDC. Operating across a 20 to 42.5 VDC range, it ensures precise signal conditioning and high noise immunity for low-power field instrumentation.

        Engineered to prevent unannounced field circuit failures in critical process units, the Triconex 3505E module incorporates automated self-test circuitry designed to detect stuck-On conditions where inputs fail to open. During continuous diagnostic cycles, internal switches momentarily apply a zero-voltage reference to verify optical isolation circuitry while freezing the last valid process data in the I/O processor to prevent false trips. With response delays under 8 ms for Off-to-On transitions and under 15 ms for On-to-Off transitions, the card delivers fast execution for emergency shutdown (ESD) and fire and gas monitoring applications.

        Built for high-availability petrochemical, oil and gas, and power generation environments, the Triconex 3505E module supports online hot-spare placement to allow live replacement without process interruption. The card connects to field wiring using a dedicated external termination panel (ETP) via chassis backplane cabling, while integrated mechanical slot keying prevents accidental insertion into incorrect chassis locations. Front-panel PASS, FAULT, ACTIVE, and 32 point status LEDs provide immediate visual diagnostics, while 1,500 VDC optical isolation safeguards internal control logic against severe field voltage surges.
        Alternative Names
        3505 3505e 3505-E 3505E-DI Tricon 3505E 3505E DI Module Triconex 3505E Low Threshold DI Module Invensys Tricon 3505E 24 VDC Input Module
        Technical notes
        The Triconex 3505E module incorporates dark red front-panel color coding and features mechanical keying on the backplane connector to restrict chassis insertion strictly to pre-assigned digital input slots.
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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
        What turn-on current is required for the Triconex 3505E module?
        The nominal turn-on current for the Triconex 3505E module ranges from 3 mA to 5 mA.
        Does the Triconex 3505E module support self-testing for stuck-on conditions?
        Yes, the Triconex 3505E module incorporates an automated self-test feature to detect stuck-On circuit conditions.
        What level of optical point isolation does the Triconex 3505E module provide?
        The Triconex 3505E module provides 1,500 VDC point isolation between field circuits and the Tricon controller.
        What field wiring interface is required for the Triconex 3505E module?
        The Triconex 3505E module requires a separate external termination panel (ETP) connected via backplane cabling.
        How does the mechanical keying feature work on the Triconex 3505E module?
        Mechanical keying prevents the Triconex 3505E module from being inserted into improper or incorrectly configured chassis slots.
        How can users request a price quote or technical support for the Triconex 3505E module?
        Customers can contact our sales engineering team via email or web request form to obtain pricing, availability, and technical integration assistance for the Triconex 3505E module.

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