Error and system messages
4.4 Diagnostics with STEP 7
IM151-1 FO STANDARD interface module (6ES7151-1AB05-0AB0)
Manual, 02/2010, A5E01075965-03
39
4.4 Diagnostics with STEP 7
4.4.1 Diagnostics readout
Introduction
The slave diagnostics comply with IEC 61784-1:2002 Ed1 CP 3/1. Depending on the DP
master, slave diagnostics can be read out with
STEP 7
for all DP slaves that comply with the
standard.
Length of the diagnostics frame
● The maximum frame length for the ET 200S is as follows:
– IM151-1 FO STANDARD (DPV0 mode): 62 bytes
– IM151-1 FO STANDARD (DPV1 mode): 110 bytes
● The minimum frame length is
– 6 bytes (identifier-related diagnostics, module status, and channel-specific diagnostics
disabled via parameter assignment).
Options for reading out the diagnostics
The table below shows the options for reading out the diagnostics with
STEP 7
on
PROFIBUS DP.
Table 4- 2 Reading out the diagnostics with STEP 7 on PROFIBUS DP
Automation system with DP
master
Block or tab in
STEP 7
Application Reference
"DP Slave Diagnostics"
tab
Slave diagnostics in plain text on
the STEP 7 user interface
"Diagnosing hardware" in
STEP 7
Online Help
SFC 13 "DP NRM_DG" Reading out slave diagnostics
(store in the data area of the user
program)
SFC see
STEP 7 Online Help
SFC 59 "RD_REC" Reading out S7 diagnostic data
records (save to the data area of
the user program)
See "System and Standard
Functions" Reference Manual
SFB 52
"RDREC"
Reading data records from the
DP slave
SFB see
STEP 7 online help
(system functions/-function
blocks)
SIMATIC S7/M7
SFB 54 "RALRM"
1
Receiving interrupts from
interrupt OBs
SFB see
STEP 7 online help
(system functions/-function
blocks)
1
only for S7-400 from V3.0 and CPU 318 from V3.0
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