Triconex 3721A High-Reliability Triple Modular Redundant Differential Analog Input Module

Description

• • Environmental Parameters
    • Operating Temperature: -40°C to 70°C, adapting to extreme temperature changes in outdoor and indoor industrial sites
    • Storage Temperature: -40°C to 85°C, ensuring the module retains its performance during long-term storage and transportation
    • Operating Humidity: 5% – 95% non-condensing, avoiding circuit malfunctions caused by moisture corrosion in humid environments such as chemical plants and coastal industrial areas
• Functional Features
  • Enhanced Triple Modular Redundancy Architecture: The module adopts an optimized triple modular redundancy structure. Three independent internal circuits simultaneously perform signal collection and conversion. The final effective data is determined through a median selection algorithm. Even if two channels fail, the module can still operate normally, completely eliminating the impact of single-point or double-point failures on the system.
  • Stable and High-Precision Signal Acquisition: The programmable 12-bit or 14-bit resolution and measurement accuracy of less than 0.15% of full scale range enable the module to capture subtle changes in field signals such as temperature and pressure. The 10-millisecond fast update rate ensures that the control system can obtain real-time field data and respond promptly to parameter changes.
  • Strong Anti-Interference and Protection Capabilities: It has an excellent common mode rejection ratio of -85 dB from DC to 100 Hz, which can effectively filter out common-mode noise from industrial power supplies and wiring. The continuous overvoltage protection capability can resist abnormal voltage impacts. Meanwhile, the isolated input points prevent mutual interference between channels, ensuring the stability of signal collection.
  • Hot-Swappable and Easy Maintenance: The module supports hot spare capability, allowing on-site maintenance personnel to replace faulty modules online without shutting down the entire system. This significantly shortens maintenance time and reduces economic losses caused by unplanned downtime. The clear status indicators enable quick fault location.
  • Wide System Compatibility: It can be seamlessly integrated with Triconex series control systems and chassis. It matches the external termination panel of the Triconex system perfectly. It also supports communication with upper-level systems such as SCADA through the system backplane, reducing the difficulty of system integration and facilitating overall operation and management.
• Application Scenarios
  • Oil and Gas Industry: Deployed on offshore drilling platforms and onshore oil transmission stations, it collects pressure and flow signals from oil and gas pipelines and storage tanks. When abnormal parameters such as pipeline leakage are detected, it transmits signals to the emergency shutdown system immediately to trigger shutdown procedures and avoid explosion accidents.
  • Petrochemical Industry: Installed on chemical reactors, distillation towers and other key equipment, it collects real-time temperature and pressure signals during chemical reactions. It sends accurate data to the control system to adjust reaction conditions in a timely manner, preventing violent reactions or substandard product quality due to parameter deviations.
  • Power Generation Industry: Applied in thermal power plants, nuclear power auxiliary systems and hydropower stations, it monitors analog signals such as temperature and pressure of boilers, steam turbines and transformers. It ensures the control system adjusts equipment operating parameters promptly, preventing equipment damage caused by overheating and maintaining stable power output.
  • Metallurgical Industry: Used in blast furnaces, steelmaking converters and continuous casting equipment, it collects temperature and pressure signals in the smelting and casting processes. It provides data support for adjusting smelting parameters, ensuring the uniformity of molten steel quality and avoiding furnace lining damage caused by local overheating.
  • Pharmaceutical Industry: Integrated into pharmaceutical production lines, especially in high-temperature sterilization, drug crystallization and mixing processes. It collects real-time temperature and pressure signals of production equipment to ensure each production link complies with GMP standards and avoids batch drug quality problems caused by unstable process parameters.
  • Chemical Industry: Used in pesticide, chemical fertilizer and fine chemical production equipment. It collects concentration and reaction temperature signals in chemical synthesis processes. It helps the control system accurately control the reaction progress, improve product yield and avoid environmental pollution caused by incomplete reactions.