The function suppresses writing values of specified object of the Historical value type into the archive database and leaves original values.

None.

Use of the function is meaningful only for historical values evaluated periodically (archiving method Periodical). If a value of such historical value is determined by the function %ARC_Nowrite(), the value will not be written into the archive database and the function will leave original value.

For historical values evaluated on change (archiving method On value change), the function behaves like the the function %ARC_Unwrite.