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Two concrete towers stand 20 meters above the ground at the UK Environment Agency's Dartford Barrier Flood Defence System in Kent, England. The barrier is routinely closed in conjunction with the bigger Thames Barrier upstream to prevent high tide water in the River Thames flowing back up the creek and flooding Dartford and the surrounding area.
Much of the equipment the control system spoke to was PROFIBUS- or Siemens-based. Two PROFIBUS Master communication modules (MVI56-PDPMV1) from ProSoft Technology were installed inside ControlLogix PACs to facilitate communications.