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Decentral Peripherie: Im151-7: Halt led always lights & Sf led is off

Hello members,
I have a problem with the IM151-7 Cpu, the stop led always lights and SF led is off, but the run led couldn't be lights up,as mentioned in the attached picture ( the missing module is an anlog module 4AI 2 wire) , is this problem caused when this analog module was defected or other causes, please I need your help or guidance sir
Thanks

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