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        AI3351 S2

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Triconex AI3351 S2 is a 32-point commoned analog input module designed for 4–20 mA DC signal acquisition with high diagnostic capability and fault tolerance. It converts field input signals into digital values and supports triple-channel processing with mid-value selection for reliable data output.
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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
        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 AI3351 S2

        • Manufacturer:
          Invensys
        • Part Number:
          AI3351 S2
        • Product Family:
          Triconex
        • Product Type:
          Analog Input Module
        • Points:
          32, commoned
        • Nominal input current:
          4–20 mA DC
        • Operational current range:
          2–22 mA DC
        • Absolute maximum field voltage:
          33 V DC
        • Absolute maximum reverse field voltage:
          0.6 V DC
        • Absolute maximum input current:
          50 mA DC
        • Input bandwidth (3dB):
          16 Hz
        • Source impedance:
          180 Ω
        • Functional-to-protective-earth isolation:
          500 V DC, minimum
        • Functional-to-functional-earth (logic) isolation:
          800 V DC, minimum
        • Weight:
          1.3 kg
        • Estimated shipping dimensions:
          4.3x18.8x21.8cm
        • Tariff Code:
          2710199310
        • 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 Diagnostics Application Scenarios Monitoring

        Features:

        • Three independent input channels with mid-value selection ensure reliable signal validation
        • High-speed scanning with sub-millisecond response supports real-time industrial monitoring
        • Continuous diagnostics with hot-sparing capability improves system availability and fault tolerance
        The Triconex AI3351 S2 is widely used in industrial automation systems for accurate analog signal acquisition and processing. Its 32-point commoned input structure allows dense signal integration while maintaining stable electrical performance. The AI3351 S2 ensures consistent data conversion through independent channel processing, making it suitable for systems requiring high reliability.

        The AI3351 S2 operates with three parallel input channels that independently process incoming current signals before applying a mid-value selection method. This design reduces the impact of single-channel faults and improves overall signal consistency. With a scan time of less than 1 ms, the AI3351 S2 supports fast system response in dynamic industrial environments.

        In terms of system reliability, the AI3351 S2 includes continuous diagnostic monitoring for each channel and activates fault indicators when abnormalities are detected. It supports operation under single or multiple fault conditions while maintaining functional stability. The AI3351 S2 also supports hot sparing functionality, allowing online replacement without interrupting system operation.

        The AI3351 S2 Triconex Analog Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Triconex AI3351 S2 Analog 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.
        Triconex AI3351 S2 Analog Input Module Specs

        General

        • Manufacturer Triconex
        • Model AI3351 S2
        • Condition New Original ready stock
        • Product Family AO3481 S2,DO3401 S2
        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.
        • Triple Module Redundancy Check: Utilizes a TMR architecture to compare input data from three processing channels in real time, automatically eliminating abnormal channel data with significant deviations.
        • Input Loop Integrity Detection: The system automatically identifies open circuits, short circuits, or signal out-of-range conditions and sends specific channel alarm information to the control room.
        • Hardware Online Self-Test: The module continuously runs a background self-diagnostic program, monitoring the operating status of the A/D converter, reference voltage source, and internal power supply in real time.
        • Fault Indicator Lockout: When an unrecoverable hardware failure is detected, the panel fault indicator lights up and locks, assisting maintenance personnel in quickly locating the fault.
        • Industrial Process Monitoring: Real-time acquisition of 4-20 mA or 0-5 VDC analog signals from transmitters for monitoring critical process parameters such as pressure, flow rate, and liquid level.
        • Safe Shutdown System (ESD): Triggers interlocking protection logic when an analog input exceeds a safety threshold, ensuring safe shutdown of plant equipment in emergency situations.
        • Fire and Gas Monitoring Integration (F&G): Integrates with temperature, smoke, and gas detector signals, serving as a core input unit for fire and gas protection systems.
        • Boiler and Turbine Protection: Provides highly reliable data acquisition of operating parameters for large rotating machinery, preventing equipment from operating under overpressure or overheating conditions.
        • Real-time Variable Mapping: Acquired analog values ​​can be directly mapped to the TriStation development environment, allowing operators to observe process curves in real time on the HMI screen.
        • Signal Filtering and Smoothing: Supports digital filtering of fluctuating signals at the software level, ensuring stable readings for the monitoring screen and control logic.
        • Historical Event Recording: In conjunction with the system controller, timestamped (SOE) records of critical input transitions can be recorded, facilitating post-incident analysis of the cause of the incident.
        • Online Status Maintenance: Supports remote viewing of module health values ​​and runtime via engineering station, enabling a shift from preventative maintenance to predictive maintenance.
        Description
        The Triconex AI3351 S2 is engineered as a high-density analog input module with 32 commoned input points, specifically designed for 4–20 mA DC industrial signal acquisition. The AI3351 S2 operates within an input current range of 2–22 mA DC and supports a nominal input impedance of 250 Ω with a 100 Ω I-to-V resistor. With a 12-bit resolution and 0.15% full-scale accuracy at 20 mA, the AI3351 S2 ensures precise signal conversion for control systems requiring stable measurement integrity.

        The AI3351 S2 incorporates three independent input channels, where each channel processes incoming signals separately before transmitting data to the processing modules. The AI3351 S2 uses a mid-value selection algorithm to ensure that only the most reliable value is used in each scan cycle. With a scan time of less than 1 ms for all 32 points, the AI3351 S2 maintains fast system responsiveness while preserving signal accuracy.

        Designed with robust electrical protection, the AI3351 S2 supports a maximum field voltage of 33 V DC and an absolute reverse voltage tolerance of –0.6 V DC, along with a maximum input current of 50 mA DC. The AI3351 S2 also provides functional-to-protective-earth isolation of 500 V DC and functional-to-functional-earth isolation of 800 V DC, ensuring stable operation under industrial electrical conditions.

        The AI3351 S2 includes continuous diagnostic functionality, including Force-to-Value Diagnostic (FVD), which monitors each channel independently. If a fault is detected, the AI3351 S2 activates its fault indicator without affecting the full module operation, allowing continued performance even under single or multiple fault conditions. Hot sparing capability enables online replacement, ensuring uninterrupted system continuity when used with AI3351 S2.
        Alternative Names
        AO3481 S2 DO3401 S2 SDO3411 3351 AI3351
        Technical notes
        Triconex AI3351 S2 is a 32-point commoned analog input module with 4–20 mA DC nominal input, 2–22 mA DC operational range, 33 V DC maximum field voltage, –0.6 V DC reverse voltage limit, 50 mA DC maximum input current, 16 Hz bandwidth, 180 Ω source impedance, 250 Ω input impedance, 100 Ω I-to-V resistor ±0.01%, 12-bit resolution, 0.15% full-scale error, <1 ms scan time for 32 points, 500 V DC functional-to-protective-earth isolation, and 800 V DC functional-to-functional-earth isolation.
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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 makes AI3351 S2 suitable for multi-channel signal processing?
        It uses 32 commoned input points and three independent channels, allowing simultaneous signal handling with channel separation for reliability.
        Why does AI3351 S2 use a mid-value selection algorithm?
        It ensures that the most accurate and consistent value is selected from multiple channels, improving signal reliability during each scan cycle.
        How does AI3351 S2 handle fault conditions in operation?
        It performs continuous diagnostics and activates a fault indicator when issues are detected, while maintaining operation under single or multiple faults.
        What is the role of input impedance in AI3351 S2?
        The module operates with a 250 Ω input impedance and 100 Ω I-to-V resistor, supporting stable current-to-voltage conversion.

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