Fail-Safe Modules
7.7 4 F-DO DC24V/2A PROFIsafe digital electronic module
ET 200S Distributed I/O System - Fail-Safe Modules
172
Installation and Operating Manual, 08/2008, A5E00103686-07
7.7.5
Diagnostic Functions of the EM 4 F-DO DC24V/2 A PROFIsafe
Behavior in case of supply voltage failure
In the case of a voltage dip in the external auxiliary voltage, the SF LED lights up, the
module is passivated.
With the subsequent supply recovery (level must remain above the specified value for at
least 1 minute (refer to the technical specifications: voltages, currents, electrical potentials))
the SF LED goes out again, the module remains passivated. The SF LED flashes if there are
no other errors, until the error is acknowledged.
Diagnostic functions
The table below provides an overview of the diagnostic functions of the EM 4 F-
DO DC24V/2A PROFIsafe. The diagnostic functions are assigned either to one channel or to
the entire module.
Table 7- 36 Diagnostic functions of the EM 4 F-DO DC24V/2A PROFIsafe
Diagnostic Function*
Fault
Number
LED Effective Range of
Diagnostics
Can be
Assigned
Parameter
s
Short circuit
1
H
SF
Channel
No
Overload
4
H
SF
Channel
No
Overtemperature
5
H
SF
Module
No
Wire break
6
H
SF
Channel
Yes
Internal error
9
H
SF
Module
No
Parameter assignment error
10
H
SF
Module
No
Sensor voltage or load voltage missing
11
H
SF
Module
No
Communication error
13
H
SF
Module
No
Safety-related shutdown
19
H
SF
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
(Page 41)".
