PROFIBUS DP Communication Module
SIRIUS 3RW44 System Manual
8-26 GWA 4NEB 535 2195-02 DS 04
8.9 Diagnosis with STEP 7
8.9.1 Reading the Diagnosis
Length of the diagnosis telegram
The maximum length of the telegram is 32 byte.
8.9.2 Options for Reading the Diagnosis
Table 8-9: Reading the diagnosis with STEP 7
Reading the S7 diagnosis with SFC 13 "DP NRM_DG" (example)
This is an example of how to read the slave diagnosis for a DP slave in the
STEP 7 user program using SFC 13.
Assumptions
The following assumptions are true for this STEP 7 user program:
• The diagnostic address is 1022 (3FE
H
).
• The slave diagnosis is to be stored in DB82: from address 0.0,
length 32 bytes.
• The slave diagnosis consists of 32 bytes.
STEP 7 user program
Automation system with
DP master
Module or register in
STEP 7
Application Refer to ...
SIMATIC S7/M7 SFC 13 "DP NRM_DG" Reading the slave diagnosis
(store in data area of the user
program)
Chapter 8.9.3 "Structure of the
Slave Diagnosis" on Page 8-27,
For
SFC, refer to the online help in
STEP 7
STL Explanation
CALL SFC 13
REQ :=TRUE
LADDR :=W#16#3FE
RET_VAL :=MW0
RECORD :=P#DB82.DBX 0.0 BYTE 32
BUSY :=M2.0
Read request
Diagnostic address
RET_VAL of SFC 13
Data compartment for diagnosis in DB82
Read operation runs over several OB1
cycles
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