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STEP 7 / STEP 7 Lite: Issue Including my 314ifm Central Processing Unit

hello,
i m facing a serious problem with my s7314ifm cpu..... i make a ladder logic program ... and it successfully downloads into the cpu but when i run it on the cpu the input goes high and the input LED on the cpu gets on ... but the cpu is not providng the output and the output LED remains off... although the simatic is monitoring the output address as high but the cpu is not giving the output .. i have 4 plc's which are making the same problem .. please help me out of it ...its quite serious for me...
thanx in anticipation.

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