FD67 Profibus-DP Manual
34
7 Diagnosis
7.1.1 Behaviour in case of interrupted communication
Il the internal system connection is interrupted (communication line or sensor supply from the bus node to
the different I/O modules) the whole system is switched into fault status. Input data cannot be read any
more. The internal status of the system connection is indicated via the bus node diagnosis.
Profibus line interrupted
Bus node :
BusRun LED
Green flashing
U
S
LED
Green
Profibus diagnosis
The user in not accessible
I/O module :
U
S
LED
Green
Outputs
Outputs are switched off.
Internal system connection interrupted
Bus node
BusRun LED
Green flashing
U
S
LED
Green flashing in case of communication error in this line
Profibus diagnosis
In extended diagnosis, the error message "communication error" is activated for all
the modules that are no more accessible.
I/O module with sensor supply
U
S
LED
Green flashing
Outputs
Outputs are switched off.
I/O module withour sensor supply
U
S
LED
The module electronics is not supplied. All the LEDs are off.
Outputs
Outputs are switched off.
The colour of the U
S
or U
A
LED is dependent on the power supply status. In case of
undervoltage
and
communication error, the corresponding U
S
LED flashes red.
Caution
:
FD67 devices are not safety devices, as specified by the relevant standard. The Off-
Status of outputs must not be used to meet safety-oriented requirements of the
application
!