Led Display For Modes And Bus Faults On Profibus-Dp - Siemens SIMATIC Distributed I/O System DP/ASi Link Manual

ASi slave address So that the DP/ASi link display is not cluttered, failed ASi slaves (ASi-
SLAVE FAIL) are displayed in binary code by five LEDs.
You have to add the numbers shown on the lit LEDs to determine the address
of the failed ASi slave.
If several ASi slaves have failed, the failed ASi slave having the lowest ad-
dress is indicated. In this case the "AUTOPROG AV" LED is off.
Example
LEDs showing the numbers "1", " 2" and " 4" are on.
Add up the numbers: 1 2 4 7.
The ASi slave with ASi address 7 has failed.
Normal operation In normal operation, the only LED to be on is the "RUN" LED, which indi-
cates to you that the DP/ASi link is running properly.
Start-up
During automatic start-up, all eleven LEDs are turned on briefly. This behav-
ior allows you to check that all LEDs are in order.
LED display The display of the DP/ASi link can be divided into two arrays:
Mode display and
The mode display with the "RUN" LED is turned on as soon as the power
PROFIBUS-DP supply is established. If the DP/ASi link detects a fault on the PROFIBUS-
DP, the "BF" (Bus Fault) LED goes on.
In Table 8-2 you will find the reaction of the DP/ASi link and troubleshoot-
ing information.
Table 8-2

LED display for modes and bus faults on PROFIBUS-DP

LED Reason
RUN 24 V power supply
LED off
BF PROFIBUS-DP failed
LED on
Distributed I/O System DP/ASi Link
EWA 4NEB 710 6055-02b
Operation and PROFIBUS-DP faults
ASi array with indication of failed slaves
Meaning
This LED goes on as soon as the
24 V power supply is estab-
lished.
The DP/ASi link is restarting.
Input and output data are set to
0 by the DP/ASi link.
Diagnostics and Error Handling
Remedy
Check the 24 V power supply.
Check the PROFIBUS-DP for
interrupt.
Check the DP master for avail-
ability.
8-3