Triconex 3664 Key features
Module applies dual-circuit 2oo3 voting for each switch, reducing fault-propagation risk
Voltage-loopback diagnostics verify switch operation independently of load
Comprehensive channel diagnostics activate FAULT & LOAD/FUSE indicators
Hot-spare capability enables module replacement without downtime
Optimized redundancy offering lower cost vs full TMR output modules
Performance comparison
Parameter | 3664 | 3604E | 3674 |
Redundancy | 2oo3 dual, commoned | TMR, non-commoned | 2oo3 dual, de-energize-to-trip |
Channels | 32 | 16 | 32 |
Current per Channel | 2 A | 2 A | 2 A |
Optimized For | Cost-effective safety applications | Medium shutdown loops | Safety shutdown with fail-zero logic |
Summary:
Compared with full TMR output modules like 3604E or 3625, the 3664 offers dual redundancy at lower cost. The 3674 variant provides de-energize-to-trip behavior for fail-safe shutdown schemes.
Typical cooperation cases
Europe – Petrochemical Control Systems
3664 modules manage valve shutdown loops where cost-effective reliability is critical. Voltage-loopback feedback ensures accurate field device monitoring.
North America – Refinery Emergency Shutdowns
Deployed in secondary safety racks for alarm and trip logic. Hot-spare support minimized plant downtime during maintenance.
Asia – Power Generation Turbine Shutdown
Used in turbine protection loops to reduce redundancy cost while maintaining fail-safe performance.
Middle East – Offshore Platform Safety
Installed to control ESD valves. Rugged design and voltage diagnostics ensure secure operations in harsh offshore environments.
