Dan the Man

Hi Controlsdude, Thank you for the excellent response. The information at the link you provided will be very useful. However, it's not quite what I was looking for. I was looking for information on hardware changes between the various series of each card. Sorry, I probably should have made the thread title a bit clearer. It's a funny situation because I seem to be the only person interested in it. Even our local Rockwell rep doesn't know where to find it.

Hi guys, Sorry if this topic has been answered already, but I've been searching for some time now and have been unable to find the information I'm looking for. I would like to know if there is any information regarding the differences or changes to AB devices with each series increment and, if so, where it can be found. Eg. What are the differences between a 1756-DNB series A and B cards? I am more specifically interested in the ControLogix equipment, but I imagine if there is a central repository of such information all of AB's products could be found there. Thank you in advance for your help. Dan.