Fail-Safe Electronic Modules
8.1 8 /16 F-DI DC24V PROFIsafe Digital Electronic Module
ET 200pro Distributed I/O System - Fail-Safe Modules
Operating Instructions, 05/2007, A5E00394073-02
81
Requirements for Machine Protection Applications With Category 4
The following requirements apply to machine protection applications with Category 4:
●
State-of-the-art wiring must be used between the sensors and the automation system or
between the automation system and the actuators to prevent short circuits.
●
All short circuits listed in the above table are detected. Detection of a short circuit is
sufficient in this case, because two faults must exist for the short circuit to occur (both of
the short-circuited signal cables exhibit an insulation fault). Thus, a multiple short-circuit
analysis is not required.
Processes for detection of all short circuits are also permissible if individual short circuits are
not detected, provided:
●
The short circuits do not cause corruption of read signals compared to the sensor signals
or
●
The short circuits cause corruption of read signals compared to the sensor signals, but in
the direction that ensures safety.
8.1.9
Diagnostic Functions of the 8/16 F-DI DC24V PROFIsafe Electronic Module
Behavior in Case of Supply Voltage Failure
Failure of sensor supplies Vs1 to Vs4 is indicated by the SF LED, the VsF LED, and the
LEDs of the relevant channel group on the F-module. This information is also provided on
the module (diagnostic entry). The relevant channel groups or channels (in the case of
channel-level passivation) of the module are passivated.
Diagnostic Functions
The following table presents an overview of the diagnostic functions of the 8/16 F-DI DC24V
PROFIsafe electronic module. The diagnostic functions are assigned either to one channel
or to the entire module.
Table 8-14 Diagnostic Functions of the 8/16 F-DI DC24V PROFIsafe Electronic Module
Diagnostic Function*
Fault
Number
LED
Signaled in
Use Case
Range of
Effectiveness
of Diagnostic
Assignabl
e
Short circuit
1
H
SF
1, 2, 3
Channel
Yes
Overtemperature
5
H
SF
1, 2, 3
Module
No
Fault
9
H
SF
1, 2, 3
Module
No
Parameter assignment error
10
H
SF
1, 2, 3
Module
No
Sensor voltage or load voltage
is missing
11
H
VsF
VsF
1, 2, 3
Module
No
Communication error
13
H
SF
1, 2, 3
Module
No
Safety-related shutdown
19
H
SF
2.3
Channel
No
*: Specifically for F-modules; display in
STEP 7
, see the "Channel-Specific Diagnostics, Fault Types
of Fail-Safe Modules" table
