reg-SIEMENS PLC CPU 315-2PN/DP

Dear Sir,

I have faced a problem in SIEMENS PLC CPU 315-2PN/DP,the PLC is not communicating with the SCADA.I have called a service engineer,he told me that the program in the CPU got erased.

I want to know that what may be the conditions for program erase in the CPU.

Can you please give me a brief description.

with regards,
c.v.k.kishore

I have called a service engineer

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that must be a very good engineer in order to make that conclusion on distance.
I very much doubt the program got erased. but there is no way of drawing a conclusion now because there is not enough information about the system.

Is the MMC missing in the CPU?