A proximity switch shown on a PLC is also placed on a fluid power schematic. Why? To save you a bunch of work, both in the design and build/debug phases. If symbols are represented in multiple drawings, you can set them up to be tied together. Others include hydraulics, pneumatics, single line diagrams, wiring diagrams, etc. Examples include a switch in a P&ID drawing to an input on a PLC. So, how is AutoCAD Electrical allow for "families." Besides Parent/Child relationships, you can tie any symbols together with "Sibling" symbols. That is a perfect example of parent/child symbols. You have the coil and associated contacts shown on multiple pages of your schematic package. Who would have thought that AutoCAD Electrical is a “family” of sorts? Part of the power of AutoCAD Electrical is the ability to tie together various symbols that represent one component.
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