4/19/2012 3:33 PM | |
Joined: 1/28/2009 Last visit: 9/10/2024 Posts: 6849 Rating: (1365)
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Hello , About the difference check here: Difference between FB and FC'sSFBs need (DB) to perform but SFCsdo not need that.Both are embeded in the CPU and no need for extra memoray to be allocated.About their usage, please check the following manual: http://support.automation.siemens.com/WW/view/en/44240604 Best regards, Hamid Hosseini |
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4/19/2012 6:23 PM | |
Joined: 9/27/2006 Last visit: 9/25/2024 Posts: 12283 Rating: (2685)
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Hello Rajkiran; To add to our friend Hamid's information, SFC/SFBs are System and Standard functions created by Siemens to allow users to perform specific tasks, in such a way that the code is already available in the CPU memory. These tasks include RunTime meters, interrupt controls, S7 communication blocks, Profinet and Ind. Ethernetblocks, PID loops, S7-300H redundancy blocks... However they must still be called in the user program when they are required. The following link will show you all the available information on the System and Standard Functions, including OBs, arranged in logical sections.: http://support.automation.siemens.com/WW/view/en/44240604 You can otain the same info in the Online Help of Step 7, if required. Hope thios helps, Daniel Chartier |
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