Diagrams are drawings of electrical and fluid systems. There are four diagram types:

Block diagrams are high-level layouts of electrical or fluid systems. These layouts illustrate the relationship between components and subsystems. They are typically the first stage in the diagramming process.

Circuit diagrams are maps of electrical systems that illustrate signal networks and logical component connections. Also known as schematic diagrams, they are typically the second stage in the electronic diagramming process and are used to create wiring diagrams.

Wiring diagrams are detailed diagrams of each circuit in an electrical system. They show all circuit components including wires and connectors. If a circuit diagram has been used to create a wiring diagram, the wiring diagram and the circuit diagram are linked. Wiring diagrams can also drive 3D harness designs in Cabling.

Process and Instrumentation Design (P&ID) diagrams are maps of a fluid system or systems, usually of or for large-scale equipment. They are typically the second stage of the fluid-system diagramming process and illustrate major functional components including valves and orifice plates. They also document flow direction and include pipeline details, bore sizes, and control and instrumentation symbols. P&ID diagrams can also drive 3D piping designs in Piping.