Array Tags

You can configure array tags in Plant SCADA for an IEC 60870-5-104 device using the following syntax:

D<IOA>[array size]

Be aware, however, that each element of an array is delivered independently. This means Plant SCADA will receive separate array value updates after each array element value changes.

Example

Assume a user configures an array I100[5], and its initial value is {0,5,0,0,10}.

If the values for the first two elements change to 4 and 10, Plant SCADA will first display {4,5,0,0,10} and then {4,10,0,0,10}.

The quality of the array tag will be equal to the worst quality of the array elements, and the timestamp will be equal to the latest timestamp of the array elements.

Note: The address format used above demonstrates an unstructured tag address (i.e. "<IOA>"). The IEC870IP driver also supports structured tag addresses (e.g. "<IOA1>.<IOA2>.<IOA3>"). For more information, see Structured Tag Addressing.