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IO Transfer Fail alarm in Control Module

Hi Everyone,

We have control modules fetching data from SIS and all the modules are assigned to MQ Controller in DCS. This fetched data is used to trigger some control loops outputs to 0. We have observed all the modules in MQ controller have given ''IO Transfer Fail'' alarm. This triggered control loops outputs to 0. Please suggest possible reasons for all control modules in a controller to raise ''IO Transfer fail'' alarm.