OPC Unified Architecture, Part 3 13 Release 1.04
4.8.2 Well Known Roles
All Servers should support the well-known Roles which are defined in Table 2. The NodeIds
for the well-known Roles are defined in Part 6.
Table 2 – Well-Known Roles
BrowseName Suggested Permissions
Anonymous The Role has very limited access for use when a Session has anonymous credentials.
AuthenticatedUser The Role has limited access for use when a Session has valid non-anonymous credentials
but has not been explicitly granted access to a Role.
Observer The Role is allowed to browse, read live data, read historical data/events or subscribe to data/events.
Operator The Role is allowed to browse, read live data, read historical data/events or subscribe to data/events.
In addition, the Session is allowed to write some live data and call some Methods.
Engineer The Role is allowed to browse, read/write configuration data, read historical data/events,
call Methods or subscribe to data/events.
Supervisor The Role is allowed to browse, read live data, read historical data/events, call Methods or
subscribe to data/events.
ConfigureAdmin The Role is allowed to change the non-security related config
OPC Unified Architecture, Part 3 13 Release 1.04 4.8.2 Well Known Roles All Servers should support the well-known Roles which are defined in Table 2. The NodeIds for the well-known Roles are defined in Part 6. Table 2 – Well-Known Roles BrowseName Suggested Permissions Anonymous The Role has very limited access for use when a Session has anonymous credentials. AuthenticatedUser The Role has limited access for use when a Session has valid non-anonymous credentials but has not been explicitly granted access to a Role. Observer The Role is allowed to browse, read live data, read historical data/events or subscribe to data/events. Operator The Role is allowed to browse, read live data, read historical data/events or subscribe to data/events. In addition, the Session is allowed to write some live data and call some Methods. Engineer The Role is allowed to browse, read/write configuration data, read historical data/events, call Methods or subscribe to data/events. Supervisor The Role is allowed to browse, read live data, read historical data/events, call Methods or subscribe to data/events. ConfigureAdmin The Role is allowed to change the non-security related config