NEW YORK, July 30 - U.S. stocks opened flat on Wednesday as investors sifted through more corporate earnings reports and looked for direction on the economy after a modest sell-off in the previous session. Investors will be watching for the Federal Reserve's Beige Book, a summary of economic conditions in the 12 Federal Reserve districts for June expected at 2 p.m. (1800 GMT). Also, the Chicago Fed's National Activity Index on the current state of U.S. economic activity and inflationary pressures for June is expected at 10 a.m. (1400 GMT). The Dow Jones industrial average <.DJI> edged up 22.34 points, or 0.24 percent, to 9,226.80. The broader Standard & Poor's 500 Index <.SPX> rose 2.19 points, or 0.22 percent, to 991.47. The technology-laced Nasdaq Composite Index <.IXIC> added 1.02 points, or 0.06 percent, to 1,732.39.