Nate Holt's Blog

August 20, 2009

Dual Range Component Tagging: Power Vs. Control – AutoCAD Electrical

Filed under: Electrical, Tips — nateholt @ 8:06 am

Setting up different component tagging sequentials for power schematics versus control schematics

This posting is a flip-side of the last one… now dealing with component tags instead of wire number tags.

Let’s say that the customer wants his schematics to use sequential component tagging (instead of line reference or X-Y grid reference tagging). He wants all 240/480VAC power components (ex: motor circuits) to be tagging starting at sequential “1”. But he wants the control schematic components to be sequentially tagged starting at sequential “500”. And, he has a small amount of pneumatic circuitry and these components to be tagged with sequentials starting at number “1000”.

Initially you might think that this is not going to be too much fun. You fear that you’re going to be manually typing in a lot of “fixed” component tag values and having to track the next sequential for each component type and each component voltage (power, control, or “pneumatic”).

But, using a little trick, it ends up that it is very easy to set up AutoCAD Electrical to automatically assign and track multiple sets of next available component tag-IDs.

Here’s how

Let’s say that the customer’s project is probably going to be 10 power schematics, 25 controls schematics, and two pneumatic logic drawings.

Power Schematics

This is how you’d set up the Drawing Properties for each of the 10 power schematic drawings.


Controls Schematics

Here’s what you would set up for EVERY controls schematic:


Pneumatic Schematics

… and here is the setup for pneumatic schematic drawings in the customer’s project:


Yes, It Works!

So, as you insert components into your design, AutoCAD Electrical checks the active drawing’s starting sequential (will be either “1”, “500”, or “1000” depending upon what type of drawing you’re working on). As the new component goes in, AutoCAD Electrical starts at this sequential. It formats a candidate component tag using the tag format value for the drawing (ex: %F%N meaning the tag is family code plus sequential). Then it scans the project to see if this tag is unique. If not, it increments to the next sequential and checks again. Keeps going until it finds a unique tag.

This will fail to give desired results under extreme conditions. For example, if AutoCAD Electrical finds more than 499 power fuses on your project’s 10 power schematics, then power fuses will start to bleed into the control fuse tag range. In this case, power fuses would start to compete with controls fuses for the next available fuse tag number 500 or greater. AutoCAD Electrical would still maintain unique component tag-IDs for all the fuses… you’d just have a mixture of power and control fuse tags in the 500 range and higher.


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