| In the above example, the problem could
have resulted because the tag had been directed at an integer area
of a data block. At runtime, the Citect driver would use the
Applicom API Readdifdword function to request one word at the
selected address when the page was displayed. The profibus FMS
protocol interprets this request as a request for one of the
underlying datatypes at that address ie one integer. As a LONG is
two integers in width, an error would result. This example
highlights the need use the Citect driver datatypes that match the
device internal data block structure. |
