Figure 4: Redundant system with Safe ESD for Safe CLOSING
Figure 5: Redundant system with Safe ESD for Safe OPENING
4.5. Examples of applications
Safe OPENING of a pressure vessel using the Safe ESD function
The standard PLC controls the entire system. A system fault occurs if excessive
pressure is generated within the system. In this case, the safety PLC immediately
opens the valve for safe pressure relief.
15
Part-turn actuators
with AC 01.2-SIL/ACExC 01.2-SIL Safety instrumented systems and safety functions
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