Siemens SIMATIC S7-300 FM 350-1, Manual

Page: 49 / 198

Programming the FM 350-1
5.4 The FC DIAG_INF function (FC 1)
FM 350-1 Counter module
Manual, 05/2011, A5E03648639-01
49
5.4 The FC DIAG_INF function (FC 1)
Functionality
FC DIAG_INF reads data record DS1 from FM 350-1 and makes it available at the DB of
FC CNT_CTL1. The transfer sequence in particular:
●
DS1 will be read from FM 350-1 by setting the init parameter IN_DIAG = TRUE.
● DS1 will be written to the DB of FC CNT_CTL1, starting at DW 54. DS1 is transferred by
calling SFC RDSYSST.
● The function copies the return code (RET_VAL) of the SFC to the RET_VAL parameter of
FC DIAG_INF.
● When the function has been executed, the function resets init parameter IN_DIAG and
reports completion of the transfer.
Manual /2/ contains a detailed description of SFC RDSYSST.
Call
FC DIAG_INF can be called within the cycle, and in the interrupt program. There is no point
in calling it in the time-controlled program.
The call of FC DIAG_INF is demonstrated below in STL and LAD format.
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Figure 5-3 Call of FC DIAG_INF
Parameters of FC DIAG_INF
Table 5- 9 Parameters of FC DIAG_INF
Name Declaration type Data type Meaning User action Block action
DB_NO INPUT INT Number of the DB of FC
CNT_CTL1
entry query
RET_VAL OUTPUT INT Return code of SFC 51 query entry
IN_DIAG IN-OUT BOOL Read init bit of diagnostics
data record DS1
set and query reset