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Simotion Easy Basics reviewed 7 DP slave diagnostics Information about the various bus nodes is provided from the DP slave diagnostic function. Diagnostics is carried-out from the application. It is then possible to individually respond to the information. In this case, the bus nodes are addressed using the diagnostics function and with the help of the diagnostics address. These are determined from the Profibus address. The DP slave diagnostics essentially comprises two components: 1. All of the DP slaves are "scanned" when the controller starts-up so that when the application starts, information is already available about the configured/connected DP slaves. 2. DP slave errors that have occurred in the running program - and therefore initiate the PeripheralFaultTask - are interrogated and evaluated. Both components essentially use the FCDPSlaveDiag function. This function and both types of diagnostics are described in more detail in the following text. 7.1 General information on DP slave diagnostics The prerequisites and the significance of the DP slave diagnostics data according to EN 50170 are explained in this Section. 7.1.1 Data management Information from the DP slave diagnostics is saved in an array - type structRetValues. The number of array elements corresponds to the number of slaves - whereby the index counts, for example, from 0..2 for 3 slaves. In this case, the following constant must be assigned the number of slaves: - NUMBER_OF_SLAVES The structRetValues structure is as follows: - Element1: sDPSlaveInfo The structure, type "structDPStationAddressType" comprises a "DPSegmentID" and "dpSlaveAddress". In this case, "DPSegmentID" describes the Profibus line ("DP_2" or "DP_1") and the Profibus address is entered into "dpSlaveAddress". - Element2: boDP_Slave_Defined This type Bool variable specifies as to whether the addressed slave is configured in HW Config - or not. - Element3: boDP_Slave_Ready This variable provides information as to whether the slave is physically connected to Profibus and is ready. - Element4: boDP_Slave_SFError Here, it is displayed as to whether there is a group error for the diagnosed slave. - Element5: i32Diagnostic_Adress Diagnostics address determined at startup - Element6: dtTimeOut When a slave runs up a timer is started – this run-up operation is interrupted if a particular slave has not signaled that it is ready within a specific time (timeout) - Element7: iFunctionResult Corresponds to the return value of the system function _ReadDiagnosticData. Version Date Page Document V3.0 15.11.04 68 User documentation Copyright © Siemens AG 2003 All Rights Reserved For internal Use Only User_Manual_Simotion_Easy_Basics_V3_0.doc
Simotion Easy Basics reviewed - Element8: uDataLength This value specifies the number of bytes that the DP slave sent. The value depends on the DP slave. - Element9: aDiagnostivBytes This element is a byte array with six elements. Here, the first six of the maximum 240 bytes are saved that a DP slave can supply. Only the first six bytes are evaluated as these are identical for each DP slave (standardized in compliance with EN 50170). The following variables must be initialized - for each slave - in the startup program "progDPSlaveDiagStartUp": − SDPSlaveInfo[n].DPSegmentID : Profibus line (DP_1, DP_2) − SDPSlaveInfo[n].dpSlaveAddress : Profibus address − SDPSlaveInfo[n].dtTimeOut : Time for abort at run-up Example: Two slaves to be monitored: Slave 0 with address 32 at the “DP2/MPI” interface, slave 1 with address 11 at the “DP1” interface. − g_asDPSlaveInfo[0].sDPSlaveInfo.DPSegmentID := DP_2; − g_asDPSlaveInfo[0].sDPSlaveInfo.dpSlaveAddress := 32; − g_asDPSlaveInfo[0].dtTimeOut:= t#10s; − g_asDPSlaveInfo[1].sDPSlaveInfo.DPSegmentID := DP_1; − g_asDPSlaveInfo[1].sDPSlaveInfo.dpSlaveAddress := 11; - g_asDPSlaveInfo[1].dtTimeOut:= t#12s; Version Date Page Document V3.0 15.11.04 69 User documentation Copyright © Siemens AG 2003 All Rights Reserved For internal Use Only User_Manual_Simotion_Easy_Basics_V3_0.doc
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