The Safety Instrumented Function, whose abbreviation is SIF, is a protection layer whose objective is to achieve or maintain a safe state of the process when a specific dangerous event occurs.
The Safety Instrumented Systems (SIS) are the systems responsible for the operating safety and ensuring the emergency stop within the limits considered as safe, whenever the operation exceeds such limits. The function of the SIS is to monitor the process for potentially dangerous conditions (process demands) and to take action when needed to protect the process.
SIS is composed of the same types of control elements (including sensors, logic solvers, actuators and other control equipment) as a Basic Process ControlSystem (BPCS)… A safety instrumented system (SIS) can dramatically reduce the risk of accidents in your plant. A Safety Instrumented System (SIS) is composed of sensors, logic solvers, and final control elements for the purpose of taking a process to a safe state when predetermined conditions are violated. The SIF is implemented in the SIS (Safety Instrumented System) which is normally composed of several Safety Functions. Safety Instrumented Systems must be independent from all other control systems that control the same equipment in order to ensure SIS functionality is not compromised. Yokogawa has over 50 years of experience in the development and implementation of safety systems and is the world's most trusted automation solutions partner for efficient project execution and safety system solutions.
SIS is defined by ISA S84.01 and IEC 61508 as: SIS loop: “An SIS is a distinct, reliable system used to safeguard a process to prevent a A safety instrumented system (SIS) can dramatically reduce the risk of accidents in your plant. Yokogawa has over 50 years of experience in the development and implementation of safety systems and is the world's most trusted automation solutions partner for efficient project execution and safety system solutions. A SIS is engineered to perform "specific control functions" to failsafe or maintain safe operation of a process when unacceptable or dangerous conditions occur. A SIS is utilized when the risk of an accident needs to be reduced.
are increasingly using safety instrumented systems (SIS) to complement their process control systems.
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