Fail-Safe Modules
7.5 4/8 F-DI DC24V PROFIsafe Digital Electronic Module
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
131
Diagnostic Function* Fault
Number
LED Signaled in
Application
Effective
Range of
Diagnostics
Can be
Assigned
Parameter
s
Discrepancy error (1oo2
evaluation)
safety-oriented tripping
19
H
SF 2,3 Channel No
*: Specially for F-modules; display in
STEP 7
, see "Channel-Specific Diagnostics, Fault Types of Fail-
Safe Modules" table
Note
If you have activated the short-circuit test for the F-DI module in
STEP 7
and are using only
one of the two internal sensor supplies of the module (Vs1 or Vs2), a channel M-short circuit
is then detected for each of the four channels with a sensor supply that is not used. Four
"short-circuit" diagnostic functions are generated in the diagnostic buffer of the F-module.
Special Features of Fault Detection
The detection of certain faults (short-circuits or discrepancy errors, for example) depends on
the application, the wiring, and the parameter assignment of the short-circuit test and the
sensor power supply. For this reason, tables on fault detection for the applications are
presented in
"Application 1: Safety mode SIL2/Category 3/PLd" to "Use case 3: Safety mode
SIL3/Category 4/PLe"
.
Causes of Faults and Corrective Measures
The following table contains the possible causes of the faults described for the individual
diagnostic messages of the EM 4/8 F-DI DC24V PROFIsafe and remedies.
Table 7- 25 Diagnostic messages of the EM 4/8 F-DI DC24V PROFIsafe, causes of errors and
remedies
Diagnostic
Message
Possible Causes Corrective Measures
Short circuit in the sensor
Cross circuit in the sensor
Encoder supply short-circuit
Eliminate short circuit/cross circuit
Check the sensor supply
Short circuit
Internal error Replace module
Overtemperature Shutdown due to violation of upper or
lower temperature limit value in the
module case.
Check load wiring, check ambient
temperature, check whether permissible
output current 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.
Internal error Internal module fault has occurred Replace module
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