Start with a block of any sort that you will later need to annotate the coordinates for.  I’ve started with a standard manhole block that I use as shown below.

Define an attribute with the ATTDEF command.  You may remember this process from the exercise for implementing Fields with a title block.  Define the properties of the attribute you will insert into the drawing.

Select the button to the right of the “Default” attribute area to insert a Field.  Once again, this will take you into the Field dialog box.

While in the dialog box, select “Object” from within the “Objects” category and pick the “Select object” button next to the “Object type” area of the dialog.  This will take you back into the drawing in order to select the desired block to be used.  This can also be an AutoCAD Point, as Josh described in his post.

After selecting the block and back into the dialog box, define all of the properties and formatting to be used with the Field.  You will see in the image below that I have defined the “Position” property, “Decimal” format, and “Y” value (as well as many other variables) in order to display a coordinate location for “Northing”.

In the Attribute Definition dialog box that I previously displayed, you can see that I placed the “N:” prefix in the “Default” area.  The other option in doing this is including the prefix from within the “Additional Format” dialog box as shown below.  However, doing both will result in multiple prefixes and doesn’t bode well.

Select “OK” from the Field dialog to finish inserting the Field and “OK” from the Attribute Definition dialog to return to the drawing. Below is the finished result of the Field once it has been regenerated.

You will see the Tag that you defined displayed and without the Field background.  This will not display with the coordinate value or the Field displayed until it has been inserted as a block as I’ll describe later.  Below, you will see the additional attributes that I defined using the same process with the “X” value used for “Easting” and “Z” value used for “TopCasting”.

You will probably start noticing how this could be perceived as useful in your drawings.  This is especially true if you are using a program such as Civil 3D that can associate point descriptions with a block library to insert specific blocks in point locations, essentially doing all the work for you once it has been set up.

Moving right along, let’s WBLOCK the attributes and the block out into its own drawing file.  Although this is a common practice, I have documented the process in the image below.

The next step is to insert the block into the drawing, or any drawing thereafter now that you have created reusable content.

In the image below, you will see the finished product of this exercise.  Notice that the tags are gone and the default values defined in the block are displayed, which includes the Fields.  For this to happen without an Edit Attributes dialog displayed for every insertion, make sure you check the “Preset” option under the “Mode” area of the Attribute Definition dialog box.

You can have multiple copies of this block in the same drawing, and because of the use of attributes and Fields, they will all display their unique coordinate value.  As always, there are many more options available using AutoCAD Fields with blocks and dynamic blocks, but this is a very useful and developmental start to discovering their capabilities.