Debugging functions, diagnostics and troubleshooting
10.7 Diagnostics of DP CPUs
S7-300, CPU 31xC and CPU 31x: Installation
10-22 Operating Instructions, Edition 08/2004, A5E00105492-05
Automation system with
DP master
Blocks or registers in STEP 7 Application Further Information
SFB 52 “RD_REC” and
SFC 59 “RD_REC”
Reading the data records
of S7 diagnostics (stored
in the data area of the
user program)
System and Standard Functions
Reference Manual
FB 125/FC 125 Evaluating slave
diagnostic data
On the Internet at
http://www.ad.siemens.de/simatic-cs,
article ID 387 257
SIMATIC S5 with
IM 308-C operating in
DP master mode
FB 192 “IM308C” Reading slave diagnostic
data (stored in the data
area of the user program)
Distributed I/O System
ET 200
Manual
SIMATIC S5 with
S5-95U PLC operating
in DP master mode
FB 230 “S_DIAG”
Example of reading slave diagnostic data, using FB 192 "IM 308C"
This shows you an example of how to use FB 192 in the STEP 5 user program to read out
slave diagnostics data for a DP slave.
Assumptions regarding the STEP 5 user program
For this STEP 5 user program it is assumed that:
• The IM 308-C operating in DP master mode uses the page frames 0 to 15 (number 0 of
IM 308-C).
• The DP slave is assigned PROFIBUS address 3.
• Slave diagnostics data should be stored in DB 20. You may also use any other DB.
• Slave diagnostic data has a length of 26 bytes.
STEP 5 user program
STL Description
: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
//Default address area of IM 308-C
//IM no. = 0, PROFIBUS address of the DP slave = 3
//function: Read slave diagnostics
//not evaluated
//S5 data area: DB 20
//Diagnostic data starting at data word 1
//Length of diagnostic data = 26 bytes
//Error code storage in DW 0 of DB 30
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