Siemens SIMATIC S7-200 SMART. The Run and stop led are blinking out of phase and the Error led is continously lit to RED. If i connect the plc with ethernet cable,the microwin smart software doesnot detect the PLC. What should be the Possible cause and how to find the solution?

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RUN/STOP led blinking out of phase, ERROR led is lit

Kind regards, Moderator_Lan