Opc Client Licensing - Endress+Hauser Tankvision Multi Scan NXA83B Operating Instructions Manual

Tankvision
Endress+Hauser
6

OPC Client Licensing

The OPC Data Access server will allow multiple OPC clients to connect simultaneously, up to
a limit defined in the licensing details for the site. Clients above this limit may still browse
the server namespace, viewing properties and certain configuration data, but as soon as they
connect to live tank data they will be disconnected by the server.
To view the licensing details, run the DCC Config tool and select the License tab.
1 Licensing details
The maximum number of concurrent OPC clients allowed is defined in the item Number of
OPC Clients.
Details of the current number of connected clients are available in the OPC server GLOBALS
namespace (for more details → ä 14).
The server supports OPC clients using versions 1.0, 2.0 and 3.0 of the OPC Data Access
specification.
All modes of accessing data items are supported (i.e. synchronous, asynchronous, refresh
and subscription), however when creating groups in the client there are some
recommendations for the value of the update time.
When setting up a group to contain data items from the namespace sections:
• Profile Data
• Gauge Commands
• Alarm Setpoints
• Units
• Gauge Configuration Items
• Inventory Configuration Items
OPC Client Licensing
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NXA83_DCC-Config_License_OPC-Clients
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