Controller brings synchronization (sidebar)

The Old Orchard PET line is an impressive example of how controls technology can tightly integrate and synchronize today’s packaging lines.

At the heart of this particular controls solution is an Allen-Bradley ControLogix PLC from Rockwell Automation. Mounted in a control cabinet not far from the filler, it communicates with conveyors and packaging machine PLCs throughout the line via an Ethernet communications protocol.

“It controls all the variable-frequency drives on the conveyors,” says Old Orchard maintenance manager Rob LaLone. “Based on input it receives from sensors throughout the line, it calculates the output it needs to send to the variable frequency drives, which of course determines what speed they’ll run at.” Thus, in effect, it’s the ControLogix controller that keeps the many complex and disparate pieces of equipment on the line synchronized.

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