This is a nice command I made since I was a draftsman. With some little upgrades, now it is available to everyone.

• Call the "ARB" command from your command prompt or Add-Ins ribbon. "ARB" stands for "ArrayRebar".
• select a LINE, a POLYLINE, or an ARC. (Rarely happens but an ARC is fine)
• enter your distribution code like "12F20" or "F16@200", etc.
• Finally, the app will draw an array of specified rebar dots on the selected LINE, POLYLINE, or ARC

For more information, see Screenshots and General Usage Instruction in the Help Document.