Schneider Electric is in talks to take control of the engineering-software company Bentley Systems in a deal that could be worth more than $15 billion. The French industrial company said Friday that it and Bentley were in preliminary discussions about a “potential strategic transaction,” though it warned there was no certainty an agreed deal would follow. On Thursday, The Wall Street Journal reported that the duo were talking about potentially merging Schneider’s software business with Bentley.