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        Triconex 3381
        Triconex 3381
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        Triconex 3381
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        3381

        / 4.9
        1001 reviews ｜ Need a Specific Revision?
        Triconex 3381 Pulse Input Module is a TMR-based high-speed input module designed to convert pulse signals from speed sensors into frequency and RPM data. It supports precise monitoring of rotating equipment through isolated multi-channel architecture and advanced diagnostic capability.
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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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        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 3381

        • Manufacturer:
          Invensys
        • Part Number:
          3381
        • Product Family:
          Triconex
        • Product Type:
          Pulse Input Module
        • Points:
          6, channel-isolated, commoned ground
        • Input type:
          Differential
        • Sensor compatibility:
          Magnetic, active, open collector
        • Maximum operating voltage:
          ±33 V DC
        • Speed range:
          0 to 32,000 RPM
        • Input frequency range:
          0.5 Hz to 32 kHz
        • Duty cycle:
          20% to 80%, or 10 µs minimum pulse width
        • Maximum continuous slew rate:
          4,000 Hz/sec with 60 gear teeth
        • Maximum continuous RPM slew rate:
          4,000 RPM/sec with 60 gear teeth
        • Number of gear teeth:
          1–255
        • Termination resistor:
          Baseplate configurable
        • Pull-up resistor:
          Baseplate configurable
        • Resolution:
          24 bits
        • Absolute error:
          ± 0.01%, 2,000 to 32,000 Hz, ± 0.1%, 0.5 to 2,000 Hz.
        • Measurement algorithm:
          Gear multiple tracking
        • Diagnostic:
          Precision reference test
        • Minimum scan update rate:
          20 ms
        • Functional-to-protective-earth isolation:
          500 V DC, minimum
        • Functional-to -functional-earth (logic) isolation:
          800 V DC, minimum
        • Weight:
          1.4 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 Configuration Application Scenarios Protection

        Features:

        • Six-channel isolated input design enables independent high-frequency pulse acquisition with shared grounding structure.
        • High-resolution 24-bit processing with gear-based tracking algorithm ensures stable RPM and frequency conversion.
        • Continuous diagnostic system with mid-value selection enhances measurement reliability under multi-fault conditions.
        The Triconex 3381 Pulse Input Module is developed for high-speed signal acquisition from rotating equipment using multiple sensor types. It converts voltage transitions into precise frequency and RPM data through a structured multi-channel architecture. Each channel operates independently, ensuring that signal integrity is maintained even when handling high transition rates. The module is designed to support complex monitoring requirements in demanding industrial environments.

        In operation, the Triconex 3381 processes signals from magnetic and other compatible sensors positioned near rotating shafts or gears. It continuously samples each transition and calculates rotational speed based on pulse timing and gear tooth information. The system applies internal data handling methods to ensure stable scan outputs, even when signal conditions vary. This allows consistent performance across a wide operating range.

        The Triconex 3381 Pulse Input Module also incorporates diagnostic and fault detection functions for each channel. If an issue is detected, it triggers system alerts while maintaining operational capability under single-fault conditions. With support for hot-spare configuration and mechanical keying for correct installation, the module is designed to maintain system continuity and prevent incorrect deployment in configured baseplates.

        The 3381 Triconex Pulse Input Module may still be available for purchase and support from Apter Power beyond End-Of-Life (EOL) by the manufacturer (OEM).
        Triconex 3381 Pulse 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 3381 Pulse Input Module Specs

        General

        • Manufacturer Triconex
        • Model 3381
        • Condition New Original ready stock
        • Product Family 3482,3451,3382S2
        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.
        • Parameterized Filtering: Supports flexible setting of signal filtering constants in software, accurately filtering out spurious pulses caused by field mechanical contact jitter or noise.
        • Multi-Mode Setting: Channels can be defined as cumulative counting mode or instantaneous frequency measurement mode according to process requirements without changing hardware wiring.
        • Sensitivity Adjustment: Allows threshold voltage adaptation on the system side for different amplitude magnetoelectric or eddy current sensors, improving acquisition accuracy.
        • Online parameter download: Supports synchronous modification of logical configurations such as sampling period via engineering station during system operation without affecting other redundant channels.
        • Turbine speed monitoring: Installed on steam turbines or gas turbines, it receives pulse signals from speed sensors to achieve overspeed protection control (OPC).
        • Flow accumulation calculation: Works with industrial turbine flow meters to perform real-time, highly reliable accumulation of fluid volume in oil pipelines or natural gas distribution stations.
        • Compressor surge prevention: Captures high-speed pulse changes in the compressor rotor, providing critical speed input for the surge prevention algorithm and preventing damage to core equipment.
        • Rotating machinery interlock: In shaft speed monitoring of large fans or mixing equipment, it serves as an input source for the Safety Instrumented System (SIS) to trigger overspeed interlock protection.
        • Input Overcurrent Limiting: Each pulse channel has a built-in current limiting circuit to prevent damage to internal circuits due to field sensor failure or short circuits.
        • Surge Protection: The module features industrial-grade electromagnetic compatibility (EMC) immunity, capable of withstanding transient pulse voltages from motor starting or lightning strikes.
        • Signal Logic Clamping: Physically clamps signals with abnormal frequencies, ensuring invalid signals do not cause erroneous triggering of the logic processing layer.
        • Reverse Voltage Shielding: Effectively blocks reverse current in case of incorrect polarity at field terminals, protecting the expensive pulse transmitter from damage.
        Description
        The Triconex 3381 Pulse Input Module is designed with six channel-isolated inputs sharing a commoned ground, enabling high-reliability signal acquisition from multiple speed sensing points. Each input operates using a differential signal structure and supports sensor types such as magnetic, active, and open collector devices, commonly used in rotating machinery monitoring systems.

        Within the Triconex 3381 architecture, three isolated electronic channels independently process voltage transitions from each input point. These transitions are converted into frequency-based RPM data, which is then organized into arrays and transmitted to the associated Main Processors. A voting mechanism is applied at the processor level to ensure data integrity before application use.

        The module supports a wide measurement range, including speeds from 0 to 32,000 RPM and input frequencies from 0.5 Hz to 32 kHz. It is capable of handling up to 32,000 transitions per second, while maintaining accuracy through a 24-bit resolution system and a precision reference diagnostic function for continuous verification.

        The Triconex 3381 Pulse Input Module uses a gear multiple tracking algorithm to calculate rotational speed based on sensor pulses and gear tooth counts ranging from 1 to 255. It also applies a mid-value selection method to ensure stable scan data, with a minimum scan update rate of 20 ms for consistent signal processing.

        Electrical characteristics of the Triconex 3381 include a maximum operating voltage of ±33 V DC, termination and pull-up resistors configurable at the baseplate level, and support for duty cycles between 20% and 80% or a minimum pulse width of 10 µs. Isolation levels include 500 V DC functional-to-protective-earth and 800 V DC functional-to-functional-earth separation.
        Alternative Names
        PI3381 2381 EPI 3382S2 3481 3451 PI 3381
        Technical notes
        Triconex 3381 Pulse Input Module, 6 channel-isolated inputs with commoned ground, differential input type, sensor compatibility magnetic/active/open collector, maximum operating voltage ±33 V DC, speed range 0–32,000 RPM, input frequency range 0.5 Hz–32 kHz, duty cycle 20%–80% or 10 µs minimum pulse width, maximum continuous slew rate 4,000 Hz/sec with 60 gear teeth, maximum continuous RPM slew rate 4,000 RPM/sec with 60 gear teeth, number of gear teeth 1–255, termination resistor baseplate configurable, pull-up resistor baseplate configurable, 24-bit resolution, absolute error ±0.01% (2,000–32,000 Hz), ±0.1% (0.5–2,000 Hz), measurement algorithm gear multiple tracking, diagnostic precision reference test, minimum scan update rate 20 ms, functional-to-protective-earth isolation 500 V DC minimum, functional-to-functional-earth isolation 800 V DC minimum.
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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 is channel isolation important in Triconex 3381?
        Because each of the six inputs is channel-isolated, it prevents signal interference and ensures that a fault in one channel does not affect others.
        How does the module convert sensor signals into RPM values?
        It samples input transitions, measures timing, and applies a gear multiple tracking algorithm to calculate frequency and rotational speed.
        What sensors can be used with Triconex 3381?
        It supports magnetic, active, and open collector speed sensors commonly installed near rotating gears or shafts.
        What happens if a channel failure occurs in Triconex 3381?
        The module continues operation with diagnostics identifying the faulty channel, while the system remains functional under single or multiple faults.

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