User Manual 08/2003 Edition

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4 4 Communications via PROFIBUS DP 02.99 4.3 Parameter area (PKW area) Transferring traversing blocks Rules for the task/response processing 4-114 For SIMODRIVE POSMO A the traversing blocks are saved in parameters which means that they can only be read and changed via the PKW mechanism. Reader’s note The parameters for the traversing blocks are described in Chapter 5.3.2. When mapping the traversing blocks to the parameters, the parameter number defines the block components (position, velocity, etc.) and the sub–parameter number of the traversing block number. Example: P0081.17 ––> position, parameter 81 with traversing block 17 Addressing in the PKW mechanism: The parameter ID (PKE) addresses the block components. The sub–index (IND) addresses the traversing block number This means that a complete set can only be read or changed one after the other via the individual components. Additionally: 1. Machine data is mapped to the parameters 2. Additional parameters (e.g. P947, P953, etc.) are possible from the PROFIBUS Guidelines. The following rules apply for the task/response processing: 1. A task or a response can always only be referred to one parameter. 2. The master must repeat a task until it has received the appropriate response from the slave (clock cycle: 10 ms). 3. The slave provides the response until the master has formulated a new task. 4. The master recognize the response to a task which it issued: – by evaluating the response ID – by evaluating the parameter number (PNU) – if required, by evaluating the parameter index (IND) 5. For response telegrams that contain parameter values, the slave, for this cyclic repeat process, always responds with the updated value. This involves all responses to the tasks ”request parameter value” and ”request parameter value (array)”. Siemens AG 2003 All rights reserved SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition
02.99 Siemens AG 2003 All rights reserved SIMODRIVE POSMO A User Manual (POS1) – 08.03 Edition 4 Communications via PROFIBUS DP 4.3 Parameter area (PKW area) Note The time between sending a change task and when the change actually becomes effective is not always the same. No maximum times can be guaranteed! The response times of the PKW channel depend on the utilization level of the fieldbus. 4-115 4
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Table of Contents 4 Communications
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1 1 Brief Description 04.01 1.1 Gen
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7 7 Installation and Service 04.01
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A A Abbreviations 04.01 GSD HEX HW
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A A Abbreviations 04.01 STB STW SW
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B B References 05.03 Electronic Doc
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C C Dimension Drawings 02.99 08.03
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D D EC Declaration of Conformity 08
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E E Index 08.03 Diagnostics LED, 1-
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General Documentation/Catalogs SINU
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