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      3721

      Analog Input Modules

      Product Information

      Product Describe

      Analog Input Modules

      AI; 0 to 5 VDC or –5 to +5 VDC;

      differential; 32 pts.

      Differential, DC Coupled

      • Manufacturer:
        Invensys
      • Product Category:
        DCS System
      • Estimated shipping dimensions:
        2.1x40.8x40cm
      • Weight:
        2.02 kg
      • Tariff Code:
        8537101190
      • Country of origin:
        USA
      • Place of shipment:
        Xiamen, Fujian, China
      • Voltage:
        0 to 5 VDC or -5 to +5 VDC1, + 6%
      • No. of Input Points:
        32 differential, DC-coupled
      • Resolution:
        12 bits or 14 bits programmable
      • Accuracy:
        < 0.15% of FSR from 0° to 60° C
      • Input Resistance (load):
        10 MΩ (DC), min.
      • Power-Off Resistance:
        140 kΩ (DC), typical
      • Common Mode Rejection:
        -85 dB (DC - 100 Hz)
      • Common Mode Range:
        -12V to +12V peak
      • Leg-to-Leg Isolation:
        420 kΩ, typical
      • Input Overrange Prot:
        150 VDC/115 VAC continuous
      • Stock:
        20
      By purchasing this item, you agree to the Terms & Conditions
      Moore Automated is NOT an authorized distributor of Invensys
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      Learn More Policy
      Manuals
      invensys triconex 3721.pdf
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          FAQ

          • What is the primary functional scope of the 3721 within the Triconex safety instrumented system architecture?
            The 3721 module functions as a critical input/output interface within the Triconex architecture, designed to facilitate deterministic and fail-safe data acquisition and control signal transmission, ensuring uncompromised safety integrity level (SIL) performance in safety-critical process automation environments.
          • In what manner does the 3721 module integrate with higher-level Triconex controllers and system software?
            The 3721 communicates through a robust, time-deterministic backplane bus protocol, ensuring seamless data exchange with Triconex controllers and configuration tools, thereby enabling synchronous safety logic execution and real-time status monitoring.
          • What environmental and operational parameters does the 3721 module tolerate during continuous operation?
            Designed for industrial-grade robustness, the 3721 operates reliably within a wide ambient temperature range, withstands electromagnetic interference (EMI), and conforms to rigorous shock and vibration standards, ensuring consistent performance under challenging plant conditions.
          • What advanced diagnostics and status reporting features are embedded within the 3721?
            The 3721 continuously monitors its internal circuitry and I/O channels, providing granular fault indication such as short-circuit, open-circuit, and signal integrity deviations, thus enabling proactive identification of degradation before functional impact.
          • What best practices are recommended for installation and commissioning of the 3721 to maximize performance and reliability?
            Optimal performance of the 3721 necessitates adherence to manufacturer guidelines including precise wiring protocols, electromagnetic shielding, environmental conditioning, and thorough pre-commissioning testing using certified validation tools to ensure compliance with safety lifecycle requirements.

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