Siemens SIMATIC Operating Instructions Manual page 82

Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
Note
If you have enabled the short-circuit test for the F-DI module in
one of the two internal sensor supplies of the module (Vs1 or Vs2, or Vs3 or Vs4), a channel
M-short circuit is detected for each of the four channels whose sensor supply is not used.
Four "short-circuit" diagnostic functions are generated in the diagnostic buffer of the F-
module.
Specific Characteristics for Fault Detection
Detection of some faults (such as short circuits or discrepancy errors) is dependent on the
use case, wiring, and parameter assignment of the short-circuit test. For this reason, tables
on fault detection are presented for the use cases in
SIL2/Category 3" to "Use Case 3: Safety Mode SIL3/Category 4"
Causes of Faults and Corrective Actions
The following table presents the possible causes of faults and corrective actions for the
individual diagnostic messages of the 8/16 F-DI DC24V PROFIsafe electronic module.
Table 8-15
Diagnostic
Message
Short circuit
Overtemper-
ature
Fault
Parameter
assignment
error
Sensor
voltage or
load voltage
is missing
82
Diagnostic Messages of the 8/16 F-DI DC24V PROFIsafe Electronic Module, Causes of
Faults and Corrective Actions
Fault Possible Causes
Detection
Always Internal fault
Cyclically Short circuit at the
during sensor
short-
Cross circuit at the
circuit test
sensor
Always Shutdown due to
violation of
temperature limit
values in the module
case.
Always Internal module fault
has occurred
Always Inserted module does
not match
configuration
PROFIsafe address
set incorrectly on the
F-module
Always No supply voltage or
supply voltage is too
low
Voltage dip due to
short circuit
STEP 7
"Use Case 1: Safety Mode
.
Corrective Actions
Replace module
Eliminate short circuit/cross circuit on sensor
Check ambient temperature.
Check whether permissible output current of the
sensor power supply is exceeded for the
ambient temperature.
Once the fault has been eliminated, the module
must be removed and inserted, or the power
switched off and on.
Replace module
Correct the configuration (compare actual and
preset configuration).
Check whether the PROFIsafe address on the
module matches the configuration in
HW Config
Check module for proper contact.
Once the fault has been eliminated, the module
must be removed and inserted, or the power
switched off and on.
Eliminate short circuit/cross circuit.
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
and are using only
STEP 7