PCM+ is the full-featured version of PCM.
You could use this version for 60 days as a trial version.
After that you had the choise to purchase a license and continue using the full-featured version.
Or you could register a free license and use PCM which supports limited number of features.
I used past tense because PCM+ is end of sale since July 2013 and no licenses can be purchased from HP.
http://h17007.www1.hp.com/docs/products/eos/PCM_Plus_End_of_Sale_Announcement.pdf
You can check here what are the features of PCM+ if you have already found a license.
http://h10032.www1.hp.com/ctg/Manual/c02664017.pdf
The recommended replacement is IMC
http://h17007.www1.hp.com/us/en/networking/solutions/network-management/index.aspx
HTH