bruno64121
Member
Dear all,
I am a hydraulic engineer (fluid power) and I have basic knowledge in the PLC.
I met a root on a machine:
During a fault diagnosis on a PLC SIEMENS S7-300, it turns out that the reason given by the manufacturer of the machine is that the MMC memory card is damaged and must be replaced by a new and programmed again.
The Stop LED blinks slowly indicates that according to my research on the internet, a reset (reboot) in a well defined procedure siemens.
My questions are:
1) What is the risk of such action: A reset can erase forever the machine operating program?
2) if I remove the card, the PC goes into state RUN, more red led as if it were functional again.
Why this?
3) If I replace the card with a new one, but the same characteristic but blank, this can work?
4) What you think are the causes of failure of the card?
I would add that for several days the PLC was shut down voltages for welding requirements, and the failure occurred when the power is restored to the controller: is that it can influence?
Thank you for your information, and if possible with simple words
bruno
I am a hydraulic engineer (fluid power) and I have basic knowledge in the PLC.
I met a root on a machine:
During a fault diagnosis on a PLC SIEMENS S7-300, it turns out that the reason given by the manufacturer of the machine is that the MMC memory card is damaged and must be replaced by a new and programmed again.
The Stop LED blinks slowly indicates that according to my research on the internet, a reset (reboot) in a well defined procedure siemens.
My questions are:
1) What is the risk of such action: A reset can erase forever the machine operating program?
2) if I remove the card, the PC goes into state RUN, more red led as if it were functional again.
Why this?
3) If I replace the card with a new one, but the same characteristic but blank, this can work?
4) What you think are the causes of failure of the card?
I would add that for several days the PLC was shut down voltages for welding requirements, and the failure occurred when the power is restored to the controller: is that it can influence?
Thank you for your information, and if possible with simple words
bruno