Fail-Safe Modules
7.6 EM 4 F-DI/3 F-DO DC24V PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
Installation and Operating Manual, 08/2008, A5E00103686-07
157
Behavior in Case of Cross-Circuit/Short-Circuit at the Sensor Supply
When operating with programmed external sensor supply and blocked short-circuit test, you
enable the detection of M-short circuits to M at the sensor supply and signaling at the
corresponding VsF LED. No entries are made in the diagnostics data of the module.
When operating with external sensor supply and cyclic short-circuit test, you enable the
detection of M and P-short circuits at the sensor supply and signaling at the corresponding
VsF LED. No entries are made in the diagnostics data of the module.
Diagnostic Functions
The table below provides an overview of the diagnostic functions of the EM 4 F-DI/3 F-
DO DC24V PROFIsafe. The diagnostic functions are assigned either to one channel or to
the entire module.
Table 7- 32 Diagnostic functions of the EM 4 F-DI/3 F-DO DC24V PROFIsafe
Diagnostic function*
Fault
number
LED
is signaled in
application
Effective range
of diagnostic
programm
able
Short-circuit
1
H
SF
1.1 - 1.3
Channel
No
Short circuit (on the encoder
supply)
1
H
VsF
SF
1.1 - 1.3
Channel
Yes
Internal error
9
H
SF
1.1 - 1.3
Module
No
Parameter assignment error
10
H
SF
1.1 - 1.3
Module
No
Sensor voltage or load voltage
missing
11
H
SF
1.1 - 1.3
Module
No
Communication error
13
H
SF
1.1 - 1.3
Module
No
Safety-related shutdown
19
H
SF
1.1 - 1.3
Channel
No
Discrepancy error
19
H
SF
1.1 - 1.3
Channel
No
*: Specially for F-modules; display in
STEP 7
, see "Channel-Specific Diagnostics, Fault Types of Fail-
Safe Modules" table
WARNING
Before acknowledging the short-circuit diagnosis, remedy the respective error and validate
your safety function. In this case, follow the steps described in chapter "Reactions to Faults
Special Features for 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 1.1" to "Application 1.3".
