IOP OOP alarms frequently occur in the Yokogawa system bus table
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It works fine after reinstalling it – what’s the reason? What do these two alarms mean?
IOP is divided into IOP+ and IOP-, which refer to the upper limit input alarm and the lower limit alarm respectively; this means that an alarm is triggered when the input value exceeds 21mA or falls below 3.9mA. OOP is the output short-circuit alarm – check the field bus table for any faults; usually, it is the field device that detects faults and triggers the upper/lower limit alarms