The strong dollar and weak oil prices combined to cut into Rockwell Automation Inc. sales, which fell for the second straight quarter in the period that ended March 31. Net income was $206 million, or $1.51 per share, an increase of 14.4 percent, compared with $180 million, or $1.28 per share, in the same period a year ago. Sales slipped 3.1 percent, to $1.55 billion, compared with $1.6 billion in the second quarter of 2014.