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MMC problem

8/9/2021 4:27 PM	Rate (0)
ararby Member Joined: 11/30/2020 Last visit: 8/21/2024 Posts: 10 Rating: (0)	Hi; I have a problem when I turn off my PLC for a while, the SF led is on and the stop LED is blinking (no communication possible, no reset). once the MMC card is erased with the PG i have a communication and the problem is solved. where does the problem come from? best regards NB: CPU 315-2 PN / DP 6es7315-2eh14-0ab0 MMC 512KB 6es7953-8lj20-0aa0

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8/11/2021 9:53 PM	Rate (0)
itafusna Gold Member Joined: 2/17/2020 Last visit: 1/15/2026 Posts: 1251 Rating: (237)	Hi ararby, This state of the LEDs indicates that in addition to a Hardware fault or software error (SF LED on solid red), a memory reset is requested (STOP LED flashes at a rate of 0.5 Hz). Operator controls and indicators: CPU 315-2 PN/DP and CPU 317-2 PN/DP In this way, you could try to reset the PLC via the mode selector switch, as indicated in the following manual section: SIMATIC S7-300 CPU 31xC and CPU 31x: Installation - Resetting to the Delivery State I hope this helps.
	A rating will be well appreciated.
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8/16/2021 9:54 AM	Rate (0)
ararby Member Joined: 11/30/2020 Last visit: 8/21/2024 Posts: 10 Rating: (0)	Hi; thank you for your reply. the problem occured several times, each time the PLC is turned off for a long time. i know how to solve the problem but it's a repetitive problem. if it's possible to know the origin of the problem to fix it definitively. best regards

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