The function that is executed over the values from an archive block must be defined through the Declaration part – FUNCTION. The following DDE reference is used to get the value of the function:
= D_2000|FUNC_VALUE!blname
D_2000 - DDE Server name (required).
FUNC_VALUE - requirement for the value of defined function.
blname - logical name of archive block (COM_ID).
The example of DDE reference is - here.
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