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| 2/4/2013 8:09 PM | |
Joined: 9/27/2006 Last visit: 9/10/2024 Posts: 12282 Rating:
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Hello Nibsy; Have a look at the following FAQ: How do you reset a SIMATIC S7-300 CPU and MMC (default reset or overall reset)? Hope this helps, |
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| 2/4/2013 8:29 PM | |
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Posts: 6 Rating:
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Hi Daniel, Thanks for your help... I'm still confused here though!
 is this procedure to delete the program from the RAM, or does it erase the MMC? |
| 2/4/2013 9:38 PM | |
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Joined: 9/27/2006 Last visit: 9/10/2024 Posts: 12282 Rating:
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Hello Nibsy; Sorry, the description given in the linkabove is a little sketchy. Here is a more complete presentation of the MRES function, taken from this manual (see section 27.1.2): SIMATIC Programming with STEP 7 V5.5 Memory Reset The CPU memory can be reset in STOP mode. The memory can be reset manually using the key switch (MRES) or from the programming device (for example, before downloading a user program). Resetting the CPU memory returns the CPU to its initial status, as follows: • The entire user program in the work memory and in the RAM load memory and all address areas are cleared. • The system parameters and the CPU and module parameters are reset to the default settings. The MPI parameters set prior to the memory reset are retained. • If a memory card (Flash EPROM) is plugged in, the CPU copies the user program from the memory card to the work memory (including the CPU and module parameters if the appropriate configuration dataare also on the memory card). The diagnostic buffer, the MPI parameters, the time, and the runtime meters are not reset. So, to answer your question directly:Upon masterreset (MRES), the RAM (work memory) of the CPU is cleared along with the I/O image tables, the CPU parameters are reset, and the complete program is reloaded from the load memory (in your case, the MMC). Hope this helps, Daniel Chartier |
Last edited by: dchartier at: 2/4/2013 9:42 PMLast edited by: dchartier at: 2/4/2013 9:38 PM |
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| 2/5/2013 7:42 AM | |
Joined: 9/2/2012 Last visit: 8/15/2024 Posts: 711 Rating:
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dear Daniel, what about retentive memory datas?? will it get erased?? regards Vipz |
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| 2/5/2013 7:58 AM | |
Joined: 3/21/2006 Last visit: 9/10/2024 Posts: 10228 Rating:
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http://support.automation.siemens.com/WW/view/en/17602317 |
| 2/5/2013 6:19 PM | |
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Posts: 6 Rating:
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Thanks Daniel... so, with the MRES procedure...how is this done? is it just a case of flicking the switch, or holding it down for a few seconds etc?? Peter
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| 1/9/2017 11:50 AM | |
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Posts: 1 Rating:
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This link appears to be broken. |
| 1/9/2017 12:39 PM | |
Joined: 1/21/2013 Last visit: 9/4/2024 Posts: 4620 Rating:
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Hello Johnny, which link? 1st dchartier: How do you reset a SIMATIC S7-300 CPU and MMC (default reset or ... 2nd dchartier: S7pr___b.pdf - SIMATIC Programming with STEP 7 V5.5 - ID ... UMENCHO: Retentivity behavior of S7-300 CPU 31x and complete devices C7-6xx ... |
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