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B8976060/02 11.3 Distributed I/Os (DP) Communication Between the DP Master and the DP Slave Station DP slave DP master Request slave diagnostic data 1st time Repeat job until the slave replies Send parameter assignment data Fetch configuration data Start-up phase Send configuration data Request slave diagnostic data 2nd time If no error was signalled continue with cyclic data exchange Send output data to DP slave Receive input data from DP slave Cyclic data exchange phase Request Response Fig. 11.4 Communication between DP Master CP 5430 TF/CP 5431 FMS and DP Slave During the start-up phase, the CP checks whether the DP slave station is operational by fetching diagnostic data. This job is repeated (controlled cyclically using the DP polling list ) until the slave responds with the requested diagnostic data. If the received diagnostic data do not indicate any further errors, the DP slave is then assigned parameters and configured. If no error is signaled after the second request for diagnostic data, the CP changes to the mode "cyclic data exchange" with the DP slave. 11 - 9 Volume 1
