What is BS 5070-4 – Recommendations for logic diagrams about? 
BS 5070-4 is a British Standard that discusses the use and benefits of Logic diagrams during drawing engineering diagrams.
BS 5070-4 is a part of BS 5070, which uses the symbols 0 and 1 to identify the two logic states of a binary variable. These states are referred to as the 0-state and the 1-state.
BS 5070-4 is a part of BS 5070 that gives recommendations for the practice to be followed in preparing logic diagrams and the application of binary logic symbols for such diagrams. It should be read in conjunction with Part 1 and Part 2. Analogue and hybrid techniques have not been considered.
BS 5070-4 is applicable to those forms of integrated circuit design in which the basic logic circuit elements are predefined cells which are laid out and interconnected in a manner similar to packages on a printed circuit board.
Other parts of BS 5070 give recommendations and specific definitions that are appropriate to particular engineering disciplines.
Who is BS 5070-4 - Recommendations for logic diagrams for? 
BS 5070-4 on logic diagrams in engineering diagram drawing is relevant to: 
- Mechanical engineers
- Integrated circuit designers
- Electronics industry
- Product design engineers
- Technical experts
Why should you use BS BS 5070-4 - Recommendations for logic diagrams?
A logic diagram is defined as a diagram that uses symbols for binary logic elements to depict the overall function of a system in terms of logic stages and is not necessarily related to physical implementation.
BS 5070-4 provides best industry guidance on symbols, signal names and characteristics, logic diagrams, logic circuit diagrams, and conversion of a logic diagram into a logic circuit diagram. The labelling of lines can greatly enhance the understanding of a diagram and facilitate the maintenance of a logic system, provided that the signals are named intelligently and that the allocation is based on carefully named system functions. BS 5070-4 thus fosters correct interpretation different signal lines.
Thus, BS 5070-4 can play a positive role in product designing and development such that unexpected results can be avoided and exact output can be determined. As a result, with properly connected gates, engineers and designers can ensure that the digital circuit performs its intended tasks efficiently
