TRICON 3664/3674 digital controller

Tricon 3664/3674 is a TMR triple redundant digital output module under Schneider’s Triconex brand, used for SIL3 level safety instrumented systems (SIS/ESD). 3674 is an upgraded version of 3664.

1、 Product positioning and architecture Brand affil

iation: Triconex (Schneider Electric), the core I/O module of Tricon safety control system.
Core architecture: Triple Modular Redundancy (TMR), 2oo3 voting, meets IEC 61508/61511 SIL3.
Type: Digital Output Module (DO), non main controller, used for safety interlock execution.
Relationship: 3674 is an upgraded iteration of 3664, with stronger performance and scalability.

2、 Comparison of core technical parameters

Parameter item TRICON 3664 TRICON 3674
32 output channels, 24VDC 32 channels, 24VDC
Single channel current 2A (continuous), 10A (10ms surge) and 3664
Response time ≤ 2ms ≤ 1ms (faster)
Voltage range 16-30VDC, maximum 36VDC is the same as 3664
Isolation of 1500VDC channel is the same as 3664
Diagnostic channel status, jamming, voltage alarm enhanced diagnosis, more accurate fault location
Working temperature -40 ℃~+85 ℃ -40 ℃~+85 ℃
Safety level SIL3 SIL3
Communication Modbus TCP/RTU supports EtherNet/IP, PROFINET, OPC UA, etc
Maximum I/O scale standard configuration maximum 8192 points (digital+analog+pulse)

3、 Main functions and features
High reliability redundancy: TMR architecture, single module failure does not affect output, supports online hot plugging.
Safe output: Solid state relay output, fault safe design, suitable for ESD emergency shutdown.
Quick response: 3664 ≤ 2ms, 3674 ≤ 1ms, meeting millisecond level interlocking requirements.
Comprehensive diagnosis: Real time monitoring of channel, power, and circuit integrity, supporting pre alarm.
Wide temperature environment: -40 ℃ to+85 ℃, suitable for extreme industrial sites.
4、 Typical application scenarios
Petrochemical industry: ESD emergency shutdown system, F&G fire and gas system, SIS safety instrument system.
Oil and gas: LNG receiving station, long-distance pipeline shutdown, compressor/pump safety interlock.
Electricity: boiler protection in power plants, turbine safety, emergency tripping in substations.
Coal chemical/metallurgical: gasifier, synthesis equipment, blast furnace safety control.
Nuclear power: auxiliary control system, safety level equipment interlocking.