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- I/O tag address is mapped to the Information object address, i.e. it has 3 bytes and must 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.
- 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 and also Table 1 in the balanced mode.
- Archive for providing old values: if the client requires archive values using 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.
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