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MMC Reset !

Created by: Tomy Master at: 3/27/2011 4:20 PM (4 Replies)

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3/27/2011 4:20 PM	Rate (0)
Tomy Master Gold Member Joined: 5/4/2009 Last visit: 11/23/2024 Posts: 914 Rating: (40)	Dear friends, Currently, i have a costumer who has a CPU314 connected to an operating panel. Front leds status are as follows: SF steady on (red). DC5V steady on (green). STOP blinking slowly every 2 seconds (0.5Hz). I have learned that this is the condition when the CPU asks for memory reset. My question is, if i perform a memory reset, is the user program going to be lost? Or simply the user program will be reloaded from MMC? Please i need a clarification. Regards. Tomy.
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3/27/2011 4:29 PM	Rate (1)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/13/2025 Posts: 10239 Rating: (1182)	Hello Tomy, Look at fritz Hello TEBANCH here's my take on things: Method 1: It is a "proper" Memory resetas per chapter 8.4.3 of the SIMATIC S7-300 CPU 31xC and CPU 31x: Installation manual,resulting in clearing of the work memory and reloading ofeveryting from the MMC load memory. MW's would be all zero andDB's get loaded with the offline "actual" values from the last download of them (or what as lastlast saved via SFC 84 from the user program) ... This answer is a part from Regarding to Mres Function Hope this clarify this situation. Aaa and all stars are for fritz. Another link is How do you reset a SIMATIC S7-300 CPU and MMC (default reset or overall reset)? Best regards, Hristo Mihalev
	Last edited by: UMENCHO at: 3/27/2011 4:42 PM
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3/27/2011 4:51 PM	Rate (0)
Tomy Master Gold Member Joined: 5/4/2009 Last visit: 11/23/2024 Posts: 914 Rating: (40)	Dear UMENCHO, I dont care about variables, i only care about user program. Will it be lost? Tomy
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3/27/2011 8:19 PM	Rate (0)
umencho Diamond Member Joined: 3/21/2006 Last visit: 1/13/2025 Posts: 10239 Rating: (1182)	To say thatthey should to perform MRES. And let's hope MMC is not going defective. If after MRES is still blinking you should change the card and hope they have a backup of the program. Best regards, Hristo Mihalev

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3/27/2011 8:46 PM	Rate (0)
playerslight Posts: 1064 Rating: (72)	Umencho is right but a better option is to back it up first to be safe if possible
playerslight Posts: 1064 Rating: (72)	Last edited by: playerslight at: 3/27/2011 8:48 PM
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