TS ISO 5784-1

TS ISO 5784-1 defines graphical symbols for binary logic and related functions used in fluid power logic circuits. Its purpose is to support consistent representation in circuit diagrams, so that logic elements, functions, and their role in data-processing-oriented documentation are shown with a common visual language.

How the symbols are used in diagrams

In general technical terms, fluid logic expresses binary states such as yes/no, present/absent, or on/off through pressurised fluid rather than electrical signals. The subject of this standard is the graphical notation for those functions and the rules for using the symbols in documentation and circuit diagrams. Clear symbol discipline matters because it reduces ambiguity for designers, maintenance personnel, and anyone reading the schematic.

Technical scope covered by this part

• Graphical symbols for binary logic and related operations
• Rules for symbol use in circuit diagrams
• Use in documentation for logic and related functions concerned with data processing
• Examples showing how elementary symbols may be combined
• Form A symbols aligned with IEC 617-12 and preferred for use
• Form B symbols still in circulation, but not preferred for future use

As a technical documentation standard, this part helps keep fluid power schematics readable and comparable across projects. In fluid power systems, logic functions are used for control, signal selection, and decision-like behaviour within the circuit. TS ISO 5784-1 supports that common drafting language, so the same function is not represented differently from one document to another. This listing represents a withdrawn TSE edition.