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Commissioning a new CPU. How to ?

Created by: Alex3110 at: 6/2/2019 9:11 PM (3 Replies)

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6/2/2019 9:11 PM	Rate (0)
Alex3110 Bronze Member Joined: 3/14/2010 Last visit: 9/4/2024 Posts: 359 Rating: (5)	I try commissioning a new CPU. I look at the folder "Blocks" “online”. I see the “SystemData” folder and many SFB and SFC-blocks there. I made "Upload to PG". Next, I look at the same "Blocks" folder, but in the "offline" mode and see that only the "SystemData" folder was uploaded. 1. Why didn't SFB and SFC blocks uploaded ? Next, I need to load an old STEP7-project to the CPU. That STEP7-project has no any SFB and SFC blocks at all. 2. What to do with the factory SFB and SFC in the new CPU ? Should I delete or save them ? (Now I have kept those blocks in a separate project just in case). The old STEP7 - project was developed for CPU v.2.6, and the new CPU has v.3.3.12. When I inserted MMC and tried to load the old STEP7 project into the new CPU, a warning about the incompatibility of the CPU versions was issued. But next download was Ok. After that, I switched the mode switch to "RUN" and everything worked fine, without going "STOP". The only thing - the LED "SF" was lit, because CPU was alone, without other modules. 3. What to do with the difference in versions ? Do I need to load the corresponding component for the CPU v.3.3.12 to the HW Catalog of "Simatic Manager" and then to rebuild the CPU in my old STEP7 project ? Usually it is made “online”. But what to do if “online” is not possible with any reasons ? Is it possible to do "offline" and how ? And also, is it possible to download this file with version v.3.3 “online” to a PC, and then to transfer it to another one and how? Thanks in advance.

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6/2/2019 10:48 PM	Rate (1)
dchartier Grandmaster-Expert Joined: 9/27/2006 Last visit: 11/11/2024 Posts: 12293 Rating: (2691)	Hello Alex; The System functions and function blocks (SFCs and SFBs) that you see online are actually placeholders for the actual SFCs and SFBs that you can use with the CPU you are using, and they are generated by the CPU's firmware. You cannot upload them because they are not enabled until you use each individual SFC or SFB (and OB) in your program. First here is a manual explaining the details of each one of these functions: SIMATIC System Software for S7-300/400 System and Standard Functions - Volume ½ https://support.industry.siemens.com/cs/ww/en/view/109751826 Note that all SFCs and SFBs cannot be used by all versions of the S7-300 and S7-400 CPUs. For example, you can use an OB 35 in any S7 CPU, but not OB 36, OB 37... (only for the most powerful S7-400 CPUs).If you find that a particular system function is missing in your online list, you cannot use it in your program.And the S7-300 Instruction list manual will tell you which functions are not available on different CPUs: SIMATIC S7-300 Instruction list S7-300 CPUs and ET 200 CPUs https://support.industry.siemens.com/cs/us/en/view/31977679 Next, in your programming editor instruction libraries you will find a directory for System and Standard functions. This is where you can findl the different SFCs and SFBs for inclusion in your program. Drag the one yo want to use to a programming network, as you would do for any instruction. Once the function has been inserted in your program and dowloaded to the CPU, it will appear when you do an upload. As far as eventual problems with version of the blocks, you seem to be handling it correctly until now. When you encounter a problem the CPU will signal it to you (SF LED will become active and there will be one or more entries in the CPU diagnostic buffer giving details on the fault). When that happens we can help you correct the fault, if it is possible to do so. Hope this helps, Daniel Chartier Attachment S7-300 Instruction List_ SFbs not available.jpg (137 Downloads)
	Last edited by: dchartier at: 06/02/2019 23:08:34
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6/3/2019 7:50 AM	Rate (0)
Alex3110 Bronze Member Joined: 3/14/2010 Last visit: 9/4/2024 Posts: 359 Rating: (5)	Hi,Daniel ! Thanks for your reply and explanations on SFBs & SFCs. But what should I do with them in my new CPU ? Let me remind that in my old STEP7 project no one of SFBs & SFCs is used. If exactly then SFC64 presents in project "offline" but never called in the STEP7 program code. I already downloaded my old STEP7 project to my new CPU and it works Ok without going STOP. Should I now delete all the SFBs & SFCs from the “Blocks” folder or do nothing ? The old STEP7 - project was developed for CPU v.2.6, and the new CPU has v.3.3.12. What to do with the difference in versions ? As I told before my new CPU (with downloaded my old STEP7 project) works Ok without going STOP. Do I need to make changes in my old STEP7 project in HW Config andto rebuild the CPUwith new version, i.e.with v.3.3 ?

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6/3/2019 8:04 AM	Rate (0)
ChristophD Grandmaster Joined: 5/12/2006 Last visit: 11/11/2024 Posts: 22445 Rating: (3029)	Hello, do not delete the SFB/SFC. if you need some new Features from FW V3.3 then you must update the PLC in the project (HW Config). If you don't change the PLC then you can only work with the Features from V2.6. Regards Christoph

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