Siemens SIMATIC S7-300 Series Reference Manual page 111

Example of fetching Slave diagnostic data with FB192 "IM 308C"
Here you will find an example of how to use FB192 to fetch slave diagnostic data
of a DP slave in the 192 STEP 5 user program.
Assumptions
The following assumptions are made for this STEP 5 user program:
S IM 308-C, operating as DP Master, occupies frames 0 ... 15 (number 0 of
IM 308-C).
S The DP Slave has the PROFIBUS address 3.3
S The slave diagnostic data should be written to DB20. You can also use any
data block for this.
S The slave diagnosis consists of 26 bytes.
STEP 5 Use Program
STL
:A DB 30
:SPA FB 192
Name :IM308C
DPAD : KH F800
IMST : KY 0, 3
FCT : KC SD
GCGR : KM 0
TYPE : KY 0, 20
STAD : KF +1
LENG : KF 26
ERR : DW 0
Example of reading out S7 diagnostic data with SFC59 "RD_REC"
Here you will find an example of how to use SFC59 to fetch S7 diagnostic data
records for a DP Slave in the STEP 7 user program. Reading out the slave
diagnostic data with SFC13 is similar.
Assumptions
The following assumptions are made for this STEP 7 user program:
S The diagnosis for the input module with the address 200
S Data record 1 is to be read out.
S Data record 1 is to be stored in DB 10.
PLC S7-300, CPU Specifications CPU 312 IFM to CPU 318-2 DP
A5E00111190-01
CPU 31x-2 as DP Master/DP Slave and Direct Communication
Description
Default address area of IM 308-C
IM no. = 0, PROFIBUS address of the DP slave = 3
Function: Read Slave diagnostic data
Not evaluated
S5 Data area: DB 20
Diagnostic data, starting at Data Word 1
Length of diagnostic data = 26 bytes
Error code area in DW 0 of DB30
is to be read.
H
2-21