Redundant function is most popular in ESD (Emergency shut Down) type application. Usually these products are part of the shut down loops and connected to an independent shut down control system which may be Double or Triple redundant.

Depending on the application demand, three types of redundant systems are in use:

1.) Out of 2 type voting system for high safety loops where in tripping of any of the switching circuit will trip the application.
This is typically required for critical circuits where in failure to shut down safely can have catastrophic consequences.
2.) Out of 2 type voting System for high demand loops requiring high uptime avoiding spurious trips due to equipment malfunctions. These types of systems are called for in mission critical application where in equipment failure can result in heavy losses for plant.
3.) out of 3 type voting system combining high demand and safety in system using Triple Redundant control systems to ensure safety and high uptime. These types of system are installed on most critical operations in highly hazardous process Industries.

Что тут может значить "Out of 2 type voting system "?

спасиб

imho =
1.) «Out of 2 valves» type voting system for high safety loops