Manufacturing software maker Plex Systems exploring sale?

Sources tell Reuters that Plex Systems Inc, a privately held U.S. maker of software used to run manufacturing plants, is exploring a potential sale that it hopes will value it at more than $1 billion, including debt. The move comes as the world's largest industrial companies, from General Electric Co. to Siemens AG, seek to snap up software assets to modernize their manufacturing processes, improve their supply chains and cut costs.