The following is a breakdown of the main features of Triconex 3720:
Function: Safety Integrity Level (SIL) 3 fault-tolerant controller for Safety Instrumented Systems (SIS)
Security Integrity Level (SIL): SIL 3 is the highest level of security integrity, indicating that the system can be used for critical security applications.
Fault tolerance: The Triconex 3720 is designed to withstand internal failures and maintain operational safety.
Manufacturer: Triconex (now part of ABB)
Triconex 3720 is a critical component in safety critical applications as it performs functions that are crucial for process safety:
Security logic execution: It executes pre programmed security logic that specifies how SIS should respond to process chaos or emergency situations. This logic ensures that the system takes necessary measures (such as equipment shutdown) to prevent dangerous situations from occurring.
Communication with I/O modules: It communicates with safety rated input/output (I/O) modules, receives sensor data from field devices, and sends control signals to actuators.
Data processing and voting: The Triconex 3720 adopts a fault-tolerant mechanism. It may utilize Triple Modular Redundancy (TMR), including the use of three independent processing channels. Each channel performs the same calculation on the received data, and the controller only outputs a signal when at least two channels are consistent. This redundancy helps to reduce the risk of individual internal failures endangering safety.