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Patterned lines distinguishing pneumatic, electric and software signals.
Also known as: Signal line conventions, Pneumatic signal line
Signal lines on a process diagram are distinguished by their pattern: cross-hatched for pneumatic, dashed for electric, a line of circles for a software link, and dotted for capillary. The pattern says what would fail in a power cut, which is why it is drawn rather than annotated.
Distinguish the medium of an instrument signal — pneumatic, electric, hydraulic, software or capillary — by line pattern.
Contexts: Technical drawing
Carry safety-relevant information, since a pneumatic loop and an electric one behave differently on loss of power or air.
Contexts: Technical drawing
Straight lines crossed by short repeated ticks, broken into dashes, or drawn as a chain of small circles.