The Property TotalRunningHours counts the number of hours the machine module has been in operation since the last time its configuration was changed. More specifically, time is counted when the machine module state is different from: Stopping, Stopped, Aborting, Aborted, Clearing.

The Value of the Property TotalRunningHours shall be persisted both in the OPC UA Server and in the underlying system so that if one fails and/or is replaced, the other will allow restoring the Value when the OPC UA Server and underlying system are on separate hardware infrastructure.