A ring topology may often be found in older plants.
The telegrams are sent from one drive to the next one via a FO ring. Every drive takes the data which are addressed to it from the data stream and sends the reply data to the next drive.
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When acquiring parameter in a ring topology, ensure that the connected drives are set to “Ring” topology. In DriveWindow, the parameter “CH3 HW CONNECTION” in the parameter set “DDCS Control” of each drive has to be checked and set to “RING”.
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