Am I restricted to the tag name provided by an OPC server ?

No, RAPID must use the name from the OPC server to collect data from it, but also supports 2 additional naming fields for each tag. These are ‘Alias’ which is typically a shorter name for the data and ‘Description’ which is a longer name. For data sources where there is no specific item names, the name can be generated to suite the application and the ‘Alias’ used to make the external link, for instance in a MODBUS connection the alias is used to specify the address.