Siemens SIMATIC S7-300 Hardware And Installation Manual page 188

Testing functions, Diagnostics and Fault Elimination
Agreement for the STEP 5 user program
For this STEP 5 user program it is assumed that:
• The IM 308-C operating as DP master uses page frame 0 to 15 (number 0 of IM
308-C).
• The DP slave has the PROFIBUS address 3.
• Slave diagnostics data should be stored in DB 20. Here you can also use any
other data block.
• Slave diagnostic data has a length of 26 bytes.
STEP 5 User Program
STL
:A DB 30
:SPA FB 192
Name :IM308C
DPAD : KH F800
IMST : KY 0, 3
FCT : KC SD
GCGR : KM 0
TYP : KY 0, 20
STAD : KF +1
LENG : KF 26
ERR : DW 0
Example of reading out S7 diagnostic data with SFC 59 "RD REC"
Here you will find an example of how to use SFC 59 in the STEP 7 user program
to read S7 diagnostics data records for a DP slave. reading slave diagnostic data is
similar with SFC 13.
11-18
Default address area of IM 308-C
//IM no. = 0, PROFIBUS address of the DP slave = 3
//Function: Read slave diagnosis
//not evaluated
//S5 data area: DB 20
//Diagnostic data as of data word 1
//Length of diagnostic data = 26 bytes
//Error code storage in DW 0 of DB 30
S7-300 Programmable Controller Hardware and Installation
Description
A5E00105492-02