Stumped. DL06 Address "B"

Anybody have any info on the address prefix "B" used on the DL06 units?

I am working with 4 Direct Logic DL06 units (D0-06AR) connected to each other via ethernet on ECOM-100 cards. Some of these units are also configured with extra modules, analog input (F0-4AR2DA-1) and thermocoupler (F0-04THM). I have been tasked with understanding what an existing program is designed to do and I am stumped by some of the addressing. Within the code, Each PLC program uses multiple addresses using a "B" prefix as well as a number with a decimal. For example: B3000.0, B3000.1, B3000.2, B3200.1, B3200.2, etc.) I cannot find the standard use for this B address anywhere in the main manual or those for the expansion modules.

Anybody ever seen this used before?

Thanks in advance.

This allows individual bit addressing with a normal 'V' word. For example B3000.0 addresses the lowest bit of V3000. In the DL06 manual search for Bit-Of-Word instructions.

Yes, this makes sense, and I've found the references to bit-of-word in the manual. Thank you for your assistance, Bernie!