nan
B- slot IO extended card; Based on the-slot IO card, add (1 AI, 1 AO, 3 bipolar X Input, 1 YT, 1 YR)IO points to expand; this extended card is not standard when leaving the factory. When users use frequency converter, when the function of slot A extended card does not meet the on-site use, they can purchase slot B extended card for function expansion;