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White Paper: Techniques for Achieving Reliability in Safety PLC Embedded Software, from Siemens

The quantity of software in equipment used for critical process control and safety instrumented systems is growing. This is due to a strong trend toward using flexible safety PLCs instead of relays or DCSs in safety instrumented systems. Safety PLCs are microcomputer-based controllers that are designed for high safety and high availability applications. Safety PLCs offer application flexibility, self-diagnostics, communication interfaces to other plant automation systems, automated application tools that help prevent human error [1] and a level of reliability and safety not
available in conventional PLC/DCS equipment.

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