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Which of the following statements is correct? Select the best choice from the options below.

A. A BPCS with high reliability (such as having redundant controllers) can be used as SIS.

B. A SIS can be used as a BPCS.

C. Since a BPCS has alarm and interlock functions, we can use it as a SIS.

D. None of the above.

Answer :

As none of the options accurately describe the relationship between a BPCS and a SIS. The correct option is Option D.

A BPCS (Basic Process Control System) with high reliability, such as having redundant controllers, cannot be used as a SIS (Safety Instrumented System). While a BPCS is responsible for controlling and monitoring the normal operation of a process, a SIS is designed to detect abnormal conditions and take actions to prevent accidents.

A SIS cannot be used as a BPCS. A SIS is specifically designed to ensure the safety of a process by taking actions to mitigate hazards and prevent accidents. It focuses on responding to abnormal conditions, while a BPCS is responsible for controlling and regulating the normal operation of a process.


While a BPCS may have alarm and interlock functions, it does not fulfill the requirements of a SIS. A SIS is designed to meet specific safety standards and has additional features, such as fail-safe operation and diagnostics, to ensure safe operation in hazardous conditions. A BPCS alone cannot provide the necessary level of safety required for a SIS.

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