scope:

This standard applies to the preparation of descriptions of the function and behaviour of control systems by establishing an implementation-independent graphical representation. It includes the symbols required as wel as rules for their use. This standard has been prepared with a view to electrotechnical applications (especially industrial ones, including electric power generation and distribution), but as it provides a general process orientated way of describing control functions, independent of their technological implementation, no-field of application is explicity excluded. It may also be applied to non-electrical systems (for example pneumatic, hydraulic or mechanical) or to parts of systems. The described method of representation should serve as a communication tool between different parties often representing different technological disciplines, involved in the engineering and use of control systems.