Troubleshooting
11-2
FM 353 Stepper Drive Positioning Module
6ES7 353-1AH01-8BG0
Error localization
The FM 353 distinguishes according to the following criteria:
S Errors which trigger a diagnostic interrupt in the CPU, and
S Errors which the module reports by way of checkback messages.
In the event of diagnostic interrupt, STATUS LEDs light up in addition.
FM 353
CPU
Callup in
user pro-
gram
User DB
MPI
OP
PG (STEP 7)
P Bus
K Bus
SSL
Diag-
nostic
inter-
rupt
“Binary” diagn.
interrupt infor-
mation
RAM
Diagn.
backup
error his-
tory
DB-SS
Other er-
rors, op-
erator
control
errors
External
channel
errors
External
errors
OB 1
OB 82
call SFC 52
POS_CTRL
.
Diagn.
buffer of
the CPU
Write diagn. interrupt information
.
.
STEP 7-Info
Parameterize FM353
SSL − System status list
SFC − System function
DB-SS − Data block for status signals
Internal
errors
POS_DIAG
Other error mes-
sage
Fig. 11-1 Overview of diagnostics/errors
Error evaluation by software
The following manuals describe how to include diagnostics-capable modules in
your user program, and how to evaluate the diagnostic messages:
S Programming manual System Software for S7-300/400; Program Design
(OB Types, Diagnostic Interrupt OB 82)
S Reference manual System Software for S7-300/400; System and Standard
Functions
A basic description of the diagnostic system of the S7-300 can be found in the user
manual Standard Software for S7 and M7, STEP 7.
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