ABB Sumphony Harmony DCS NIS/NPM Problem

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bhimani112

We are using ABB Symphony Harmony DCS in our power plant. In one unit NIS and NPM module are giving alarm sometimes. MODST block of NIS/NPM is triggering alarm. However alarm is momentarily and getting reset automatically. There is no physical error indication over module. Also no disturbance in function of module. Why such alarms are coming ?
 
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