PLC flickering issue

[amolamol 0]

We r using Siemens PLC S7 400 in small power plant. Sometimes this PLC flickers and plant stops for milliseconds and regains its position. All Digital outputs turns off and then regains its original postion. Can anybody have solution for this....???

[Jevgenijs 0]

On 05.10.2017 at 8:46 PM, amolamol said:

We r using Siemens PLC S7 400 in small power plant. Sometimes this PLC flickers and plant stops for milliseconds and regains its position. All Digital outputs turns off and then regains its original postion. Can anybody have solution for this....???

 power suply card (rack slot 0)  is powered by UPS? 

Are the output cards powered by a separate power source? does the input fail?