text: <s>[INST] about 20A-DG01 Does the DriveGuard Safe-Off option 20A-DG01 can used for pf40p,in the manual ,there is one word:Only install a Series B or greater DriveGuard Safe-Off option in a PowerFlex 40P Drive.what is the mean of Series B of pf40p; [/INST] In order to be compatible with a PowerFlex 40P drive, the DriveGuard SafeOff option should be of a series B. Series letters usually distinguish between particular revisions of an hardware device; Series is indicated clearly on the product label. - fuzzy logic \\n </s>