Safety of machinery - Functional Safety of electrical, electronic, and programmable electronic control systems. This standard was first published in 2005. It is particularly relevant to professionals who are responsible for validating the safety of machines that use complex systems such as PLC’s for safety duties. New standards such as this are continually being developed, placing unfamiliar requirements on the task of assuring machine safety, especially when more complex equipment such as PLC’s are used. This environment requires effective competency training of individuals who are responsible for specifying, designing, or otherwise applying technology to safety applications. Because safety systems are so critical, recognized and accepted standards should be applied to their design to ensure the safety of your staff and financial health of your organization.