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    By Miles Nicholson 

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    Many customers are not only responsible for producing the electrical drawings but also the instrument or pneumatic/hydraulic drawings as well. A job may have a mixed discipline design and could include pneumatic/hydraulic and electrical schematics.

    In this type of situation, a component may be drawn in the pneumatic/hydraulic drawing such as a valve and have an associated solenoid defined in the electrical schematic. These types of components would be defined as “parent” devices. However because there is an international convention for numbering pneumatics and hydraulics (ISO1219 as an example), the component in the pneumatic/hydraulic circuit would have an entirely different component tag to the one in the schematic.

    A valve in a pneumatic/hydraulic drawing may be numbered with a prefix of “V” whereas in the electrical schematic a solenoid may be numbered with a prefix of “K”

    Therefore, though each device is represented as a parent device, you can still set up a peer-to-peer relationship between them so that the electrical schematic’s tag name will automatically cross-reference to the pneumatic/hydraulic schematic and the pneumatic/hydraulic tag cross-reference to the electrical schematic.

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