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For PMIO systems, the C200 controller is replaced with a redundant C300 controller modified to fit in the space of a single C200/C200E chassis. Engineering tools import control strategies with minimal or no change, and graphics remain the same. Field wiring and I/O are also retained. Systems using Series A I/O modules can opt for C300 migration, too, which can be a suitable solution for those using the remote (downlink) chassis. CNI communication cards in I/O chassis are replaced by an FTE Bridge used to communicate the Series A I/Os (which are retained) to the C300 controllers.
Those with Series A I/Os can also replace the C200/C200E controllers with the new UOC/vUOC controller. Connected using Star or Ring topology, the UOC controller leaves the Series A I/Os untouched. Customer can also retain their ControlNet using this solution.