Trusted™ Modular Redundancy

Many issues dictate the various approaches to hardware design of programmable safety systems. Meeting the standards requires that the designer demonstrate a statistical performance, arrived at by calculation. This on its own can provide a comparative performance of safety integrity.  
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Firewalls

There is a growing recognition for the need to ensure safe operation of all software applications within redundant safety systems. Those systems meeting the latest standards are required to develop the operating system software and
application tools in accordance with safe practices and test for safe operation. With the growing demand for user friendly features and information from the system, there is an inevitable rise in the complexity of the operating system making it more onerous to test.
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Trusted™ Series Performance

The application of a safety PLC often requires that the performance be estimated. In this case performance is a function of how fast the PLC can perform a given task, usually a combination or subset of reading input variables, processing application logic and commanding outputs to a required state. For safety applications this time is used as a component of the overall loop performance that is required to be within a period considerably less than the Process Safety Time (PST). The required PST is established from the characteristics of the process being controlled and the mechanical limitations of the process plant itself.
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