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- Active read - the I/O tag generates read requests.
- Passive read - the I/O tag does not generate read requests, but it processes values read by another I/O tag with the same Class/Instance/Attribute address or Symbolic name. This mode makes sense for reading arrays, where a single I/O tag can be active and the other I/O tags are passive, so values of all (or selected) array items are read with one request.
Note: the Ethernet/IP protocol supports the reading of arrays into the structure (Target Destination tab), so it is possible to read the entire array into the column of a structure using a single I/O tag. - Write only - the I/O tag is intended only for writing.
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Note 1: if it is necessary to read the entire array MY_ARR (to the target destination structure or to multiple I/O tags), it can be done by a single read request (unless the array is too large). Set in the first I/O tag configuration:
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