ProSoft Technology’s PROFIBUS Modules and Industrial Radios allow critical data to be transmitted from ControlLogix PACs at Flood Defense System.
Two concrete towers stand 20 meters above the ground on either side of the mouth of Dartford Creek. This is the UK Environment Agency’s Dartford Barrier Flood Defense System in Kent, England. The barrier is routinely closed, in conjunction with the bigger Thames Barrier upstream, to prevent high tide water levels in the River Thames Estuary flowing back up the creek and flooding Dartford and the surrounding area.
Like a huge guillotine at the creek mouth, one gate may be slowly lowered on its supporting chains onto the river bed to block the flow of water. Then the second gate may be slowly lowered to rest onto the top of the first gate.
Just a couple of years ago, the control system was starting to show its age. As part of a large upgrade to the barrier, its associated control system was overhauled. The original control system was a completely hardwired based relay system that was over 30 years old. Spare parts for the 30 year-old system were becoming scarce.
Qualter Hall, who provides an attractive 'one stop shop' for a multitude of engineering solutions, decided to call ProSoft Technology. Qualter Hall selected this company, because it was a reliable, cost effective solution that was endorsed by Rockwell Automation.
Two Rockwell Automation ControlLogix redundant PACs are inside each of the 20-meter towers to control the opening and closing of the barrier, but much of the equipment the control system spoke to was PROFIBUS or Siemens based. Two PROFIBUS Master communication module (MVI56-PDPMV1) from ProSoft Technology were installed inside the ControlLogix PACs to facilitate communication from the Rockwell Automation processors.
Fiber optic cables were installed between the two towers, as part of the control system overhaul. While the cable links were being constructed, ProSoft Technology 802.11 Industrial Hotspot radios served as the communication link.
ProSoft Technology’s solutions helped ease the engineering work by making it possible for the ControlLogix system to communicate as one single protocol. The system now allows data to be reviewed quickly, centrally and remotely, providing convenience when accessing diagnostic information.