Siemens FM 450-1 - The FC DIAG_INF Function

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.
',$*B,1)
'%B12 
5(7B9$/ 
,1B',$* 
&$//
',$*B,1)
(1
(12
'%B12
5(7B9$/
,1B',$*
67/UHSUHVHQWDWLRQ
/$'UHSUHVHQWDWLRQ
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 diagnos‐
tics record DS 1
sets and scans this resets this
Program
6.3 The FC DIAG_INF function
Counter module FM 450-1
Equipment Manual, 03/2022, A5E03648739-AC 43