Rockwell Automation, Inc., Milwaukee, WI, has agreed to buy Pavilion Technologies Inc., Austin, TX, a supplier in advanced process control, production optimization and environmental compliance solutions for process and hybrid industries.   ; Pavilion also has offices in Europe and the Asia-Pacific region. It serves major customers in consumer products, oil & gas, chemicals and other process industries.   ; Rockwell Automation is a supplier of industrial automation power, control and information solutions. The company employs about 19,000 people serving customers in more than 80 countries.