Description
The TRICONEX 3674 is a 32-point Dual Digital Output (DDO) module used in Tricon safety control systems. It provides commoned 24 VDC digital outputs and is designed for reliable control of field devices in safety-related industrial applications. Tricon system documentation identifies models 3664 and 3674 as dual digital output modules with 32 output signals.
The 3674 uses dual output circuitry and includes self-protection against over-voltage, over-temperature, and over-current conditions. It is particularly suited to de-energize-to-trip control programs. Tricon documentation specifically cautions that the 3674 is not recommended for energize-to-trip applications because certain hardware faults can cause an output to remain OFF.
🔧 Main Function
The module drives external field loads from 32 digital output points. The outputs are optically isolated and commoned, with built-in monitoring and protection. Each point has an individual ON/OFF status indication, while module-level PASS, FAULT, and ACTIVE indicators provide diagnostic information.
🏭 Typical Applications
• Emergency Shutdown Systems (ESD)
• Safety Instrumented Systems (SIS)
• Oil & Gas facilities
• Petrochemical plants
• Chemical processing
• Power generation
• Turbine control
• Industrial shutdown systems
• Solenoid and actuator control
📋 Product Datasheet
| Parameter | Specification |
|---|---|
| Manufacturer | TRICONEX |
| Model | 3674 |
| Product Type | Dual Digital Output Module |
| Output Channels | 32 |
| Nominal Voltage | 24 VDC |
| Output Type | Dual, Serial |
| Voltage Range | 16–30 VDC |
| Maximum Voltage | 36 VDC |
| Output Configuration | Commoned |
| Maximum Current | 2 A per point |
| Surge Current | 10 A for 10 ms |
| Typical Voltage Drop | <1.5 VDC |
| Load Leakage | 2 mA maximum |
| Point Isolation | ≥1,500 VDC |
| Power Module Load | <10 W |
| Protection | Over-voltage / Over-temperature / Over-current |
| Status Indicators | Point ON/OFF, PASS, FAULT, ACTIVE |
| Color Code | Dark Blue |
| Installation | Tricon Chassis |
| Field Interface | External Termination Panel |
| Application | Safety Digital Output |
The core specifications above are documented for the 3664/3674 DDO family, including 24 VDC nominal operation, 32 commoned outputs, 16–30 VDC recommended range, 2 A maximum per point, and 1,500 VDC minimum point isolation.
⚡ Key Features
• 32 digital output channels
• 24 VDC nominal field voltage
• Dual output architecture
• Optically isolated outputs
• Self-protected output circuitry
• Individual channel status indication
• PASS / FAULT / ACTIVE diagnostics
• Designed for safety-system applications
• Suitable for de-energize-to-trip architectures
🔌 Installation & Wiring
The 3674 requires a compatible external termination panel and cable interface to connect the module to field devices. Tricon documentation lists the 3674 as compatible with specific 24 VDC commoned digital-output termination arrangements.
During installation, verify the field power supply, output polarity, termination-panel type, cable keying, and load requirements. Each output point should be checked individually before the safety system is placed into service.
🛠️ Commissioning Checklist
• Verify 3674 module identification
• Confirm Tricon chassis compatibility
• Check termination panel compatibility
• Verify 24 VDC field supply
• Inspect output wiring
• Check load current
• Verify point status LEDs
• Check PASS / FAULT / ACTIVE indicators
• Test each configured output
• Verify shutdown logic
• Record final test results
⚠️ Important Safety Note
The TRICONEX 3674 is safety-system hardware. It should be applied only within an appropriately engineered and validated Tricon safety architecture. In particular, Tricon documentation states that the 3674 is intended for de-energize-to-trip programs and is not recommended for energize-to-trip applications due to specific stuck-OFF fault behavior.
For replacement work, verify the module number, termination panel, field voltage, output configuration, application logic, and safety design before installation.
📦 Product Identification
Brand: TRICONEX
Model: 3674
Product Type: Dual Digital Output Module
Channels: 32 Digital Outputs
Nominal Voltage: 24 VDC
Output Architecture: Dual / Serial
Application: Tricon Safety System
Main Function: Safety Digital Output Control
