The "logic" of single loop logic solvers

Supplier: Moore Industries
30 January, 2014

The industrial process industry is experiencing a dynamic growth in Functional Process Safety applications.

Much of this growth has been driven by increased awareness of destruction of property, injuries and loss of life associated with tragic events that are widely publicised in the worldwide media. Companies, of course, have a moral and legal obligation to limit risk posed by their operations. In addition to their social responsibilities, the costs of litigation measuring in the billions of dollars has caught the eye of risk management executives worldwide.

As a result, management recognises the financial rewards of utilising a properly designed process system that optimises reliability and safety. That's why companies are now actively taking steps to comply with various national and worldwide safety standards such as ANSI/ISA 84 and IEC 61508/61511.

To accomplish this, safety practitioners look to a "new generation" of equipment specifically designed and approved for use in Safety Instrumented Systems that utilise Electrical and/or Electronic and/or Programmable (E/E/PE) technologies.

Safety Instrumented Systems

A Safety Instrumented System (SIS) is defi ned as an instrumented system used to implement one or more Safety Instrumented Functions (SIF). A SIS is composed of any combination of sensors, logic solvers and final control elements for the purpose of taking a process to a safe state when predetermined conditions are violated.

A SIF is a function to be implemented by a SIS that is intended to achieve or maintain a safe state for the process with respect to a specific hazardous event.