====Monitoring a ModelHost Model====

If you want to monitor the status of a ModelHost model, there are a few OPC-UA points you can use.

===Service Running===

First, if the model isn't running at all, you won't be able to connect to the OPC-UA server. 

===Process Responding===

To check if the process is responding, we have a watchdog timer/counter at the OPC-UA point **Internal/Inputs/Clock** which constantly counts upwards.

Should this stop, it would indicate that something has completely blocked the models from executing.

===Communicating===

To check if new values are coming into the ARDI system and the ModelHost process, you can check the **Internal/Inputs/Updates** counter.

This irregularly-updating counter measures how many individual points of data have changed since it first subscribed to live ARDI information.

If this stops, this might indicate a loss of connection or a failure in one or more data sources. Note that only //changes// are sent - so this counter may move very slowly during down-times or other process outages.