Triconex 3805E | 32-Point Discrete Output Module | High-Integrity Safety System I/O Selection

Description

Key Technical Specifications

• Product Model: 3805E
• Manufacturer: Triconex (Schneider Electric)
• System Platform: Tricon v10 / v11 (Triple Modular Redundant)
• Module Type: Discrete Output (DO)
• Number of Channels: 32 (grouped as 16 dual-redundant pairs in TMR context)
• Output Type: Sourcing (high-side switch), compatible with 24–48 VDC loads
• Load Capacity: Up to 100 mA per channel (with derating at elevated temperatures)
• Diagnostic Coverage: Continuous output verification, open-circuit and short-circuit detection
• Safety Certification: IEC 61508 SIL3, API 670 compliant
• Mounting: Plug-in module for Tricon chassis (supports hot-swap during operation)
• Power: Supplied via Tricon backplane; no external power required for logic

Core Performance and Selection Advantages

The Triconex 3805E delivers unmatched reliability in safety-critical actuation by leveraging the inherent fault tolerance of the Tricon TMR architecture. Each output command is generated independently by three separate microprocessors and voted before being applied to the field—ensuring that a single hardware fault cannot cause an unsafe action or fail-to-trip condition. This design provides diagnostic coverage exceeding 99%, far surpassing conventional redundant or single-channel output modules.

Compared to earlier generations (e.g., 3805A/B), the 3805E offers improved thermal performance, higher channel density, and enhanced electromagnetic compatibility (EMC), making it suitable for harsh environments like offshore platforms or petrochemical plants. Its integrated diagnostics continuously monitor load health, detecting open circuits (e.g., broken solenoid coil) or short circuits (e.g., wiring fault) and reporting them to the Tricon main processor—enabling predictive maintenance without requiring external test equipment.

From a total cost of ownership (TCO) standpoint, the 3805E reduces engineering and operational expenses by eliminating the need for external relay panels or safety relays for many SIL3 functions. Because it integrates directly into the Tricon system, all output status and diagnostics are automatically available in Triconex Enhanced Diagnostic Monitor (EDM) software, streamlining compliance reporting and reducing troubleshooting time. Additionally, its hot-swap capability allows replacement during live operation—minimizing unplanned downtime in continuous processes.

System Integration and Expandability

The 3805E is configured and managed within the Triconex TriStation 1131 development environment, which provides a unified platform for programming, simulation, and diagnostics. Application logic is written in IEC 61131-3 languages (LD, FBD, ST), and output assignments are mapped directly to hardware tags with automatic cross-checking—ensuring consistency between design and implementation.

For enterprise integration, the Tricon system supports communication to DCS, SCADA, or asset management platforms via optional modules such as the Triconex Trident or Ethernet Communication Module (4329A), which provide OPC UA, Modbus TCP, and IEC 62439 PRP support. This enables secure, real-time data flow to higher-level systems while maintaining the integrity of the safety layer.

In terms of scalability, a single Tricon chassis can accommodate up to 16 I/O modules, supporting hundreds of discrete and analog points. Multiple Tricon systems can be networked for large-scale applications (e.g., entire refinery SIS), with synchronized event logging and centralized monitoring via EDM. With Schneider Electric’s ongoing investment in the Tricon platform—including cybersecurity hardening and IIoT readiness—the 3805E remains a robust, future-proof choice for new high-integrity automation projects.