Opc server for ac 800M, Installation and Configuration

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3BSE035983-510 - en AC 800M 5.1 OPC Server

OPC Data Access Server Behavior at Power Fail OPC Server Power Failure
OPC Client Power Failure

Fast Initial Update
When an OPC client adds an item to a group with reasonably long update rate for
example, 30 seconds the OPC server updates the new item with an initial value to
the client.
When a new item is added the OPC Server starts to cyclically check if a value has
arrived from the controller at each 100 ms, independently of the group update rate
determined by the client. As soon as the value has arrived, it sets the quality to good
and updates the client. This means that the client does not have to wait until the next
regular group update, (another 30 seconds) before it can receive the new added item
with good quality.
OPC Data Access Server Behavior at Power Fail
OPC Server Power Failure
The OPC server runs as a service, and can be configured so that configurations are
automatically loaded at startup. Groups and items always have to be re-configured
after startup. See Online Help for OPC server, Autoload Configuration Settings.
OPC Client Power Failure
When an OPC client is stopped abruptly, it is detected by the OPC server, which
stop making callbacks. After DCOM time-out, all memory allocated for the specific
client, is released.
DCOM Time-out
Callbacks to the client are made on separate threads. Therefore the OPC server
never fails when DCOM problems occur. After DCOM time-out, all objects are
released according to standard COM.

Section 4 Data Access
Error Handling
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43

Error Handling
In addition to standard OPC error handling, serious errors are logged as a log file.
Errors are also presented in the OPC Server Configuration Panel by double-clicking
the icon
. This brings up error information.

What Data Can Be Accessed?
Section 4 Data Access
44
3BSE035983-510

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