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80018C_MSW_2400-2500-Profibus_1209_ENG
5.3.3 FC4 “PD 2400 2500”
This function (FC) makes available, in the data block created with UDT described in paragraph 5.3.1, the
instrument Process Data.
Each time FC is called up, both reading and writing process data are updated.
As for FC3, it must be called up in the OB1, without conditions, so that each scanning updates data and three input
parameters are requested:
FirstByte (INT) : as for FC3
DBNr (INT): as for FC3
Word_Nr(INT): number of word I/O selected in configuration HW
(0 = 1 word I/O …. 15 = 16 word I/O
FirstByte:256
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