Some days before data has stopped updating for pi tags and some interface services for PI interface has been stopped and some got configured before missing in the list.
How can I find the root cause for it?
Step 1 : Check tag configuration
Step 2: Check when tag last collected data from source.
Step 3: Check if interface is running or stopped.
Step 4: if interface is running, check if it is actively collecting data from data source. i.e. only few points stopped collecting or all points stopped collecting.
Step 5: Check Point Source is matching with tag in step 1.
Step 6: Check buffer status (Open PI Buffer Manager)
Step 7 : Check message log in PI Interface (date and time from step 2) and any errors.
Step 8 : If you are using OPC DA/HDA then use PI OPC DA/HDA Client and check instrumenttag or item id status at source. In general, you should login to OPC DA tool with account which is used for running OPC DA/HDA interface to eliminate issue with security.
Step 9 : If OPC DA client shows tag is updating but not receiving data then remove the point from interface and add-again to the same interface. This will show issue with either configuration or datatype etc.
Lal Babu Shaik
You can also check the IP Address of the Interface Node and OPC Server Node(if not on same machine). There's a chances that IP address is also changed and the PI trust is not updated accordingly.
Retrieving data ...