SIS process output actions

Describe SIS process output actions and the criteria for successful operation, for example, requirements for tight shut-off valves [ IEC 61511-1].

Information regarding the outputs from the SIS, a description of:

  • every measurement circuit
  • the architecture e.g. block and bleed
  • the number of outputs
  • type of input
  • range of measurement
  • trip levels
  • feedback

Describe the need of feedback. What will happed if the response does not occur?