8 SmartWire-DT8.9 Programming198 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com8.9.6 Acyclic parameter channel for DS7-SWD soft starter8.9.6.1 IntroductionThe acyclic parameter channel is used in order to configure the parametersof the DS7-SWD soft starter; it corresponds to PROFIdrive profile.The following sections describe the parameter channel’s functions.8.9.6.2 ProtocolThe DS7-SWD soft starter is responsible, among other things, for mappingthe protocol in such a way that SmartWire-DT will be able to use theparameter channel in a fully transparent manner. Regardless of whether datashould be read or written, the first request from the coordinator will alwaysbe a write request. The parameter request will define whether the job is aread job or a write job. After the write request is transmitted (contains reador write job), a write response without data will be expected. After this, thecoordinator, prompted by the higher-level PLC’s application, will poll the DS7with read requests. The DS7 will acknowledge the read requests negatively(error: state conflict) until the read response is completed and the DS7 cansend a response (read job: with data / write request: without data).Figure 134: Acyclic parameter channel protocolClientSWD Error OK orErrorOK orErrorOK orErrorSWD ErrorSWD ErrorParameterRequestParameterRequestError orno DataError orno DataParameterResponseParameterResponse(pos./neg.)ParameterProcessingDS7SWD Write RequestSWD Write Response(no Data or Error)SWD Read RequestSWD Read Response(no Data or Error)SWD Read RequestSWD Read Response((no) Data or Error)SWDDS7
