Schneider Electric Triconex 3625 Digital Output Module Supervised TMR

Product Overview

The Triconex 3625 (Ordering Number 3625) is a supervised digital output (SDO) module designed for use in Tricon TMR control systems. Built for safety-critical operations, this module provides 16 output points with Triple Modular Redundancy (TMR), ensuring that single-point failures do not compromise output integrity. Each output is continuously monitored to detect faults in the module circuitry, field wiring, and connected loads, providing enhanced reliability for high-integrity systems.

The supervised architecture verifies proper switching, detects stuck-on/stuck-off conditions, and confirms load presence without disrupting ongoing operations, making it ideal for extended-duration outputs.

Key Features

Triple Modular Redundancy (TMR)

• Three independent channels (A, B, and C) process output signals separately.

• A fault-tolerant output voter determines the final output state.

• Ensures continuous operation and reliability consistent with SIL 3 safety standards.

Supervised Output and Diagnostics

• Detects field-side issues such as open circuits, short circuits, or load absence.

• Performs momentary test pulses to verify switch operation without affecting field devices.

• Loop supervision ensures complete fault coverage from module to load.

Hot-Swappable Design

• Can be replaced online without interrupting system operation.

• Supports hot-sparing to maintain process continuity during maintenance.

Electrical Isolation and Protection

• Galvanic isolation separates field electronics from internal processors.

• Protects against electrical surges, ground loops, and transient faults.

Technical Specifications

Applications

The 3625 module is suitable for safety-critical control systems, including:

• Emergency Shutdown Systems (ESD)

• Fire and Gas (F&G) detection

• Burner Management Systems (BMS)

• High-Integrity Pressure Protection Systems (HIPPS)

Note: Integration with an External Termination Panel (ETP) is recommended to ensure safe and effective field connections.

FAQs

Q: Can the 3625 module be replaced while the system is running?
A: Yes, it supports hot-swapping, allowing module replacement without interrupting operations.

Q: What makes this module “supervised”?
A: It continuously monitors the health of the output circuit, including the field wiring and load, to detect open, short, or stuck conditions.

Q: Is it compatible with SIL 3 systems?
A: Yes, the module is certified to IEC 61508 SIL 3 standards for high-integrity applications.

Q: How is output integrity verified without affecting the load?
A: The module performs brief diagnostic pulses to confirm switch functionality without changing the final field output state.