Sungrow SG110CX-P2, User Manual

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DO terminal (fault output dry contact)
The relay can be set to output fault alarms, and user can configure it to be a normally open
contact (COM ＆ NO) or a normally closed contact (COM ＆ NC).
The relay is initially at the NC terminal, and it will trip to another contact when a fault occurs.
When alarm occurs, signal status change will not be triggered.
Use LED indicators or other equipment to indicate whether the inverter is in the faulty state.
The following Figures show the typical applications of normally open contact and normally
closed contact:
figure 5-8 Normal open contact
figure 5-9 Normal close contact
Devices connected to the relay should comply with related requirements:
5 Electrical Connection User Manual