I got the information from our local support guy. We are doing a new v.20 install and I wanted to make sure the DASABCIP will support it. When v.19 was first released there was a serious flaw in DASABCIP that would cause PLC to major fault and dump memory. You have to allow WW time to update their comms drivers for each new release of PLC firmware. I believe all of the DA versions are backward compatible.
DASABCIP versions are as follows:
DA v. 4.1.1 ==> CLogix v. 17.x
DA v. 4.1.2 ==> CLogix v. 18.x
DA v. 4.1.3 ==> CLogix v. 19.x and 20.x
DA v. 5.0 ==> CLogix v. 21.x