Triconex 3721 Serial Communication Module

Product Description

The Triconex 3721 is a high-integrity serial communication module designed for the Triconex Triple Modular Redundant (TMR) Safety Instrumented System (SIS) platform, engineered to enable secure and reliable serial data exchange between Triconex SIS controllers and third-party devices in mission-critical safety applications. As a core communication component of the Triconex TMR architecture, this module features triple-redundant communication paths, robust galvanic isolation, and industrial-grade components to ensure fault-tolerant operation in extreme environmental conditions (temperature, vibration, humidity, electrical noise) typical of oil & gas, chemical, and power generation facilities. Its compact rack-mount design integrates seamlessly with Triconex chassis, while hot-swappable functionality enables maintenance without system shutdown. The 3721 supports multiple industry-standard serial protocols with built-in diagnostic capabilities, making it an essential component for integrating Triconex SIS with field instruments, HMIs, and upper-level monitoring systems in safety-critical environments.

Key Functions

The primary function of the Triconex 3721 module is to provide triple-modular redundant serial communication between Triconex TMR controllers and external devices (smart transmitters, flow computers, HMIs, PLCs, SCADA systems) in safety instrumented systems, ensuring data integrity and fault tolerance for safety-critical information exchange. It features two independent serial ports supporting industry-standard protocols including Modbus RTU, DF1, ASCII, and RS-232/RS-485 physical layers, with triple-redundant data processing to validate communication integrity. The module supports bidirectional data transfer for safety-related process data (setpoints, alarms, status) and diagnostic information, with built-in error checking and retransmission capabilities to ensure reliable data delivery. It provides comprehensive diagnostic data (communication errors, port faults, protocol violations) to the Triconex TriStation engineering software for proactive maintenance and compliance reporting. Additionally, the 3721 is SIL 2 certified per IEC 61508, complies with global safety standards (ATEX, IECEx), supports hot-swap replacement to eliminate system downtime, and offers configurable communication parameters (baud rate, parity, stop bits) to interoperate with a wide range of third-party serial devices.

Application Scenarios

The Triconex 3721 serial communication module is exclusively deployed in safety instrumented systems (SIS) for high-risk industrial applications requiring reliable serial connectivity across multiple sectors. In oil and gas upstream/midstream operations, it enables communication between Triconex ESD systems and smart flow computers, pressure transmitters, and wellhead RTUs (Remote Terminal Units) over Modbus RTU/RS-485, ensuring critical process data exchange for wellhead safety control. For chemical and petrochemical plants, it integrates Triconex safety interlock systems with third-party analytical instruments (gas chromatographs, pH analyzers) and HMI panels via RS-232/DF1, enabling real-time safety parameter monitoring and operator interaction. In nuclear and thermal power generation facilities, it provides serial communication between Triconex reactor protection systems and turbine control panels, vibration monitors, and emergency shutdown annunciators over Modbus RTU, ensuring seamless safety data exchange between subsystems. The module is also essential for offshore production platforms, where it connects Triconex fire & gas SIS with remote alarm panels and wireless gateway devices via RS-485 in hazardous Zone 1/2 environments. Additionally, it is used in pharmaceutical manufacturing for serial communication between Triconex batch process SIS and recipe management systems, in mining operations for connecting Triconex conveyor safety systems with remote monitoring terminals, and in water treatment plants for integrating Triconex pump station SIS with flow measurement devices and SCADA systems over serial protocols.

Technical Specifications

Contact Information

• Sales Manager: KI MI
• WeChat: 18059884790
• WHATSAPP: +86 18059884790 (Click to add)
• Email: plc66@qq.com

Core Advantages

• 121 shared inventories worldwide, with direct procurement from overseas warehouses.
• Provide favorable prices and professional after-sales warranty services.
• All products are brand new and original; spare parts come with a one-year warranty and have been tested and certified.
• For orders of more than one product, contact us to get an exclusive discount.
• If other suppliers offer lower prices for the same products, we are willing to provide further discounts based on your budget.

Customer Distribution

Our customers are from: United States, Germany, Japan, South Korea, United Kingdom, France, Italy, Canada, Brazil, India, Australia, Russia, Spain, Netherlands, Switzerland, Sweden, Belgium, Austria, and Turkey.

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