PLC Step 5 Error


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I have a Step 5 PLC error CPU 928B.The red colour at the run/stop switch is blinking. And also no output signal. I had overall reset and transfer back the backup program, but still like previous, the red colour is blinking. I am suspect our main contractor pump but i'm not check yet. Please give suggestion/opinion what should i do.
Use the S5 software to check the PLC's I & B Stack for the cause of the error. Also check the power supplies to all the i/o cards.