Siemens simatic s7-400 FM 450-1, User Manual, Page: 50 / 130

Program
6.5 Technical specifications of the blocks
Counter module FM 450-1
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Manual, 02/2014, A5E03648739-02
6.3 The FC DIAG_INF function
Functionality
The FC DIAG_INF reads data record DS1 from the FM 450-1 and makes it available to you
in the DB of the FC CNT_CTRL. Transfer proceeds as follows:
● If initiation parameter (IN_DIAG=TRUE) the DS1 is read out from the FM°450-1.
● The DS1 is entered into the DB of the FB CNT_CTRL from DW 54 with the aid of the
SFC RD_REC.
● The return code of the SFC (RET_VAL) is copied onto the RET_VAL parameter of the
FC DIAG_INF.
● As soon as the function has been performed, the initiation parameter IN_DIAG is reset
and hence the transfer is reported as completed.
A full description of the SFC RD_REC is to be found in manual°/2/.
Call
The FC DIAG_INF can be called in the cycle and in the interrupt program. However, it is not
expedient to call it in the time-controlled program.
Calling the FC DIAG_INF in the STL and LAD representations is rendered below.
Figure 6-2 Calling the FC DIAG_INF
Parameters of the FC°DIAG_INF
Name Declaration type Data type Meaning The user... The block...
DB_NO INPUT INT Number of the data block of
the FC CNT_CTRL
enters this queries this
RET_VAL OUTPUT INT Return code of the SFC 59 queries this enters this
IN_DIAG IN-OUT BOOL Initiation bit reads
diagnostics record DS 1
sets and scans
this
resets this