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TRICONEX 3674 Dual Digital Output (DDO) module

Triconex 3674 is a Dual Digital Output (DDO) module used in Tricon Safety Instrumented Systems (SIS).

Product Details

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TRICONEX 3674

Triconex 3674 is a Dual Digital Output (DDO) module used in Tricon Safety Instrumented Systems (SIS). It is designed for safety-critical industrial applications such as emergency shutdown (ESD), burner management, and process protection in oil & gas, chemical, and power generation industries.

Main Features

  • 32 commoned digital output channels
  • Dual, serial output architecture
  • Designed for 24 VDC systems
  • Triple Modular Redundancy (TMR) compatible
  • Hot-swappable module design
  • Continuous onboard diagnostics
  • Self-protected outputs against over-current and overheating
  • Optical isolation for improved reliability
  • SIL-rated safety application support

Key Technical Specifications

Parameter Specification
Model TRICONEX 3674
Module Type Dual Digital Output Module
Output Channels 32
Nominal Voltage 24 VDC
Operating Voltage Range 16–30 VDC
Maximum Voltage 36 VDC
Output Current 2 A per point
Surge Current 10 A for 10 ms
Isolation 1500 VDC minimum
Logic Power <10 W
Operating Temperature Typically 0°C to 60°C
Diagnostics Pass, Fault, Active, Load/Fuse alarms
Mounting Tricon chassis installation
Safety Use SIS / ESD applications

Functional Characteristics

The 3674 module receives commands from the Tricon controller and drives field devices such as:

  • Solenoid valves
  • Relays
  • Shutdown actuators
  • Alarm devices

It includes built-in diagnostics that continuously monitor output integrity and can detect:

  • Stuck ON/OFF outputs
  • Load failures
  • Over-current conditions
  • Field wiring issues

The module is optimized for de-energize-to-trip safety strategies. Official Tricon documentation notes that Models 3664 and 3674 are not recommended for energize-to-trip applications because certain hardware faults could force outputs into a de-energized state.

Typical Applications

  • Emergency Shutdown Systems (ESD)
  • Fire & Gas Systems
  • Turbine Protection
  • Burner Management Systems (BMS)
  • Critical process interlocks

 

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