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- I/O tag address is mapped to the Information object address, i.e. it has 3 bytes and must be within the range of 0..16777215. It can be specified as a decimal number or as a hexadecimal number with a hash at the beginning (e.g. #0A).
The I/O tag with an address starting with %IGNORE will be ignored. - Input tags must be of particular types (Ai, Ci, Di, Qi) for received ASDU, see table 1 and also table 2 in the balanced mode.
- For a particular type of output tag (Ao, Dout, Co), it is necessary to set an ASDU type, that has to be used, see table 2.
- Archive for providing historical values: if the client asks for historical values through ASDU 250, the server sends:
- the values of the historical value specified by this input entry field,
- if the input entry field is not filled, then the values of the historical value that archives the I/O tag,
- if the specified historical value does not exist, then the values of the I/O tag that archives the control object of the specified I/O tag,
- if the control object does not exist (or the archive is not available), the server returns an error.
- If the Destination Column is configured, then the values received from the address configured at the I/O tag and above are stored in the corresponding items (e.g. objects with addresses 10, 11, 12 ... according to the number of rows of the destination structure).
Browse
For the I/O tags, it is possible to discover the list of objects, as long as the KOM process is running and communication with a station is established.
Clicking the Browse button opens the IEC870-5-104 Item Browser window and displays a list of objects that have been read so far. The object list is created dynamically as a result of received messages.
The list of objects is dynamic, i.e. when a new value arrives in the KOM process, it is updated. Filtering in individual columns is also supported, asterisks can be used in the mask (e.g. *Short*).
Double-clicking on a particular line will cause the Address parameter to be inserted into the configuration of I/O tag from which the IEC870-5-104 Item Browser window was opened.
The Refresh button clears the list of values in both the CNF and the KOM process.
The Value column contains the received value.
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The attached ZIP contains the configuration of the line, station and I/O tags for IEC104 communication. In the client subdirectory, there are line/station/I/O tag objects with the IEC 870-5-104 Client protocol, in the server subdirectory, there are line/station/I/O tag objects with the IEC 870-5-104 Server protocol, The server listens on port 2404 on the local interface (localhost). Several data and command ASDUs are configured to send the Sec and Min system tag values.
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