PROFIBUS DP-Master

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The Application Interface 184/315 6.2.4 PROFIBUS_FSPMM2_CMD_WRITE_REQ/CNF - V1 Class 2 Write Request This packet can be used to send a DP V1 Class 2 write request to a Profibus DP V1 slave. The applied addressing mechanism operates based on slot and index information. Explanations of the parameters: 1. The parameter ulCRef contains the reference of the slave responder. This number has been returned at initialization by PROFIBUS_FSPMM2_CMD_INITIATE_CNF. 2. The parameter ulSlot = Slot_Number is used in the destination device for addressing the desired data block slot (typically a module). 3. The parameter ulIndex = Index is used in the destination device for addressing the desired data block. 4. The parameter ulLength = Length indicates the number of bytes of the data block that has to be written. If the server data block length is less than requested, then the length in the response will be the actual length of the data block. If the server data block length is greater or equal than requested then the response contains the same length of data. The DP-slave may answer with an error response if the data access is not allowed. 5. The field abData contains the data block, which has to be written and consists of the number of octets indicated in the length of the request. Depending on whether the connection could successfully be opened or not, the confirmation packet will have a nearly completely different data part. However, the header part will be the same. Successful execution is signified by a value of ulSta (within the head of the confirmation packet) equal to 0, while all non-zero values at this location indicate an error during connection establishment. • In case of successful execution the description under PROFIBUS_FSPMM2_WRITE_CNF_POS_T will apply. This indicates that the read access to the slave over the MSAC_C2 connection has been performed successfully. The positive confirmation packet contains the same parameters as the request packet except the last one that has been omitted. • In case of failure the confirmation packet will be structured as described under PROFIBUS_FSPMM2_WRITE_CNF_NEG_T. For an explanation of the error handling see section 5.3.2.2 “DP V1 Error Processing” of this document and the packet description. PROFIBUS DP-Master | DOC061001API12EN | Revision 12 | English | 2010-12 | Released | Public © Hilscher, 2006-2010
The Application Interface 185/315 Packet Structure Reference ** WRITE REQ/CNF PACKET */ typedef struct PROFIBUS_FSPMM2_WRITE_REQ_Ttag { TLR_UINT32 ulCRef; TLR_UINT32 ulSlot; TLR_UINT32 ulIndex; TLR_UINT32 ulLength; TLR_UINT8 abData[PROFIBUS_FSPM_MAX_IO_DATA_LEN]; } PROFIBUS_FSPMM2_WRITE_REQ_T; typedef struct PROFIBUS_FSPMM2_PACKET_WRITE_REQ_Ttag { TLR_PACKET_HEADER_T tHead; PROFIBUS_FSPMM2_WRITE_REQ_T tData; } PROFIBUS_FSPMM2_PACKET_WRITE_REQ_T; #define PROFIBUS_FSPMM2_WRITE_REQ_SIZE (sizeof(PROFIBUS_FSPMM2_WRITE_REQ_T)- PROFIBUS_FSPM_MAX_IO_DATA_LEN) PROFIBUS DP-Master | DOC061001API12EN | Revision 12 | English | 2010-12 | Released | Public © Hilscher, 2006-2010
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Protocol API PROFIBUS DP-Master V2.
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5/315 5.3.3 Configuration of Inputs
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9/315 Table 62: PROFIBUS_FSPMM_CMD_
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Introduction 11/315 Table 178: PROF
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Dual-Port-Memory 29/315 3.1.1 Input
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Dual-Port-Memory 49/315 abSl_state
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Dual-Port-Memory 53/315 3.4 Control
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Overview 79/315 5.3.3 Configuration
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Overview 85/315 5.3.5.1 Diagnostic
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Contact 315/315 8 Contact Headquart
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PROFIBUS DP-Master

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