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| 12/26/2011 7:05 PM | |
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Posts: 6 Rating:
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what is the diffrence data blocks and what is the meaning of configration data block , and when i can change in data block and when i can not and how? |
| 12/27/2011 3:33 AM | |
Joined: 9/27/2006 Last visit: 9/8/2025 Posts: 12401 Rating:
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Hello saidnoor; Welcome to the forum. May I ask what degree of experience you have with siemens PLCs? If you are at the very begining of your learning curve, I could suggest the following link to S7-300 tutorial, that will show you many basic features of this family of PLCs, and also much advanced training (networking and control of VFDs for example): https://www.automation.siemens.com/MCMS/SCE/EN/ADVANCED_TRAINING/TRAINING_MATERIAL/DOWNLOAD_TRAINING_MATERIAL/Pages/Default.aspx If you look in the Siemens directory of the PC where you have installed your version of Step 7, you will see that some documents have already been installed that could help you understand these terms and definitions, and start programming your PLC: Programming with Step 7 and Working wioth Step 7 could be of great help to you. Now, about DBs: DBs are memory areas that you use to setup storage of information for your program.There are SDBs used by the HWConfig editor to store data about the hardware configuration of your PLC, and by the Netpro editor to store data about the networks you are setting up. SDBs cannot be accessed by the programmer directly, only through the specialized editors. They can be downloaded to the PLC from the user program, but not modified through the program. DBs in the user programs can be generated as global DBs or instance DBs,The difference between the two is that global DBs are free-configured by the user, while instance DBs are linked to the structure of the FB (Function block) to which they are associated. You can access the data in global DBs and instance DBs anywhere in the user program, without any restricitions. Hope this helps, Daniel Chartier |
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