Attributes; General About Attributes - ABB COM600 User Manual

5.4.
5.4.1.
50
Station Automation COM600 3.4
DNP 3.0 LAN/WAN Slave (OPC) User's Manual
13904 No more events can be written to one of the unsolicited message queues
since the queue is full.
13905 Internal message buffer full error.
13906 Internal message filling error.
13907 The used data object type is not supported.
13909 Internal data overflow error.
13910 The device is in the suspended state. The reason for this can be that the link
is not properly established (for example incorrect cable wiring) or the master
station does not respond.
13911 Internal message sending error.
13913 A command is sent to a channel with a non-established communication.
13914 Internal out of buffers error.
13918 The device has been set out of use.
13919 The device has been set in use.
13924 Internal buffer error.
13925 There is not any preceding command with the address given when confirming
a command. Either the address is incorrect or the command has not been
received.
13926 Internal software error.
13927 The channel to which the device is created is incorrect.
13931 The CODE item of a received control block message is unknown.

Attributes

General about attributes

In addition to item tags for process data (indications and commands), the OPC servers
and clients also provide some item tags for controlling the devices and retrieving status
information from them. These item tags are called attributes.
There are three categories of attributes: DNP LAN Slave OPC Client attributes, DNP
LAN Channel attributes and DNP LAN IED attributes. These attributes are described
in the following subsections.
The attributes are not updated automatically by the server according to the update rate
of the OPC group. Instead, it is required that the client explicitly refreshes the group or
requests a read of single attributes to retrieve the latest values. This does not matter for
most attributes, since they do not change value spontaneously. The exceptions are the
diagnostic counters and object status attributes. Object status attributes are updated
automatically by system messages, so in practice only diagnostic counters are affected
by this rule. It was introduced to avoid overloading the communication link between the
protocol stack and OPC server.
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