Overview
Manuals
Working principle
Key Applications
Features:
- TMR Analog Input Modules
- 0–5 VDC or –5 to +5 VDC, Differential, DC Coupled, TMR
- An analog input (AI) module includes three independent input channels
The Analog Input (AI) module contains three independent input channels. Each input channel receives variable voltage signals from different points, converts them into digital values, and transmits these values to the three main processor modules as needed. In TMR mode, an intermediate value selection algorithm is used to select a value to ensure correct data is obtained on each scan.
The detection method for each input point prevents a failure in one channel from affecting other channels. The Analog Input module requires a separate External Terminal Block (ETP) and connects to the Tricon backplane via a cable interface. Each module features a mechanical keying design for proper installation within the Tricon chassis. Each Analog Input module performs a complete, continuous diagnostic for each channel.
The 3721N Invensys Triconex Analog Input Modules may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Invensys Triconex 3721N Analog Input Modules manual(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.
A diagnostic fault in any channel activates the module's fault indicator, which in turn activates the chassis alarm signal. The module's fault indicator reports only channel faults, not module faults—the module can tolerate a maximum of two channel failures. The Analog Input module supports hot standby, allowing for in-line replacement of faulty modules.
Emergency Shutdown (ESD) Systems: Continuously monitor plant trip signals such as pressure, temperature, and flow. Trigger automatic shutdown operations if process parameters in a refinery or chemical plant exceed safety limits.
Fire and Gas (F&G) Systems: Process input signals from flame detectors and gas sensors, providing a rapid, fault-tolerant response for on-site safety.
Nuclear Reactor Protection: Used for process protection in safety-critical nuclear power plant systems, such as the upgrade and renovation of the Daya Bay Nuclear Power Plant.
Boiler Management System (BMS): Monitors fuel and air parameters to ensure the safe operation of industrial boilers and furnaces.
Turbomachinery Control: Used for vibration and speed monitoring to prevent mechanical failures in large turbines and compressors.
