TRICONEX 3351S2 (DO3351 S2) 32-Channel Digital Output Module for Tricon Safety Instrumented System (SIS)

Product Description

The TRICONEX 3351S2 (DO3351 S2) is a high-reliability 32-channel digital output module, a core component of the TRICONEX Tricon triple modular redundant (TMR) safety instrumented system (SIS). Engineered for SIL 3-certified safety applications, it delivers isolated, fail-safe relay outputs to actuate critical field devices (solenoid valves, emergency shutdown valves, alarm horns, pump starters) in hazardous industrial environments. Built with TRICONEX’s patented TMR architecture, it eliminates single points of failure, while robust channel-level isolation and strong EMI immunity ensure stable operation in electrically noisy settings. The 3351S2 complies with IEC 61508 SIL 3, FM, CSA, and ATEX standards, supports hot-swappable maintenance, and incorporates advanced self-diagnostics to monitor relay health and output integrity, making it an essential component for mission-critical safety interlock systems.

Key Functions

The TRICONEX 3351S2 module converts digital safety logic signals from the Tricon SIS controller into physical relay outputs to drive critical field equipment. It provides 32 fully isolated Form C (SPDT) relay channels, with each channel rated for industrial loads to accommodate diverse safety applications. Triple modular redundant signal processing and voting logic ensure that a single channel fault does not compromise system integrity, while built-in self-diagnostics continuously monitor relay coil status, contact wear, and output circuit continuity, generating real-time alarms for open/short circuits or relay failures. The module supports configurable output latching/unlatching modes to align with safety interlock requirements, and hot-swappable design allows module replacement without SIS shutdown, maximizing system uptime for critical safety applications. LED status indicators enable quick troubleshooting of channel-level faults.

Application Scenarios

The TRICONEX 3351S2 digital output module is deployed exclusively in safety-critical applications requiring SIL 3 certification and fault tolerance. In oil & gas facilities (offshore platforms, refineries, FPSOs), it triggers emergency shutdown (ESD) valves, fire suppression systems, and gas detection alarms in response to abnormal pressure/temperature readings. For chemical and petrochemical plants, it controls reactor isolation valves, emergency vent systems, and toxic material shutoff valves to mitigate explosion or leakage risks. In power generation (thermal, nuclear, renewable), it actuates turbine emergency stop systems, boiler safety valves, and cooling system shutdown mechanisms during critical faults. The module is also used in pharmaceutical manufacturing for batch process safety interlocks, mining operations for hoist/conveyor emergency stops, and water/wastewater treatment plants for chemical dosing shutdown systems—all scenarios where system failure could result in human harm, environmental damage, or catastrophic equipment loss.

Technical Specifications

• Global Inventory Network: 121 shared inventories worldwide, enabling direct procurement from overseas warehouses—supporting faster delivery and reduced logistics costs.
• Pricing & After-sales: Competitive prices paired with reliable after-sales warranty services.
• Customer Coverage: Serving clients across regions including the United States, Germany, Japan, South Korea, United Kingdom, France, Italy, Canada, Brazil, India, Australia, Russia, Spain, Netherlands, Switzerland, Sweden, Belgium, Austria, and Turkey.
• Product Quality Assurance: All products are brand new and original. Spare parts include a 1-year warranty, and all items undergo pre-delivery testing and certification.
• Discount Policy:
• Multi-product orders qualify for custom discounts (contact us for details).
• We offer further price adjustments if you receive a lower quote for identical products from other suppliers, tailored to your budget.