The TOP Server’s built-in Startup and Testing features set it apart.  The TOP Server lets you test the communications to your device using the OPC Quick Client and the Protocol Diagnostics for the Channel.  The Event Log shows detailed messages when you are having a problem and the Help file for each driver covers the meaning of the errors to point you in the right direction. 

The OPC Diagnostics can help when you are seeing issues related to your OPC Client application connecting to the TOP Server.  The OPC Options also overcome many OPC Client connection issues.  Add to these features the simulation abilities and system tags and you will see why so many companies have standardized on the TOP Server.