Siemens SIMATIC NET DP/AS-i Link 20E Manual page 125

Dealing with Problems/Error Displays
This chapter contains information on specific operating states of the
DP/AS-Interface Link 20E (DP/AS-i Link 20E) and explains how to deal with errors.
5.1 Replacing a Defective AS-i Slave/Automatic Address
Programming
Simple Replacement of AS-i Slaves
Using the automatic address programming function, you can replace failed AS-i
slaves extremely simply.
Notice
Remember that "automatic address programming" is only possible in the
following situations:
− The DP/AS-i Link 20E module is in the protected mode
and
− Only one AS-i slave has failed.
The sections below explain how to replace failed AS-i slaves using the automatic address
programming function.
Detecting a Defective AS-i Slave
If the AUP LED is lit (only in the protected mode) this indicates the following:
S Exactly 1 slave has failed.
S Automatic address programming by the DP/AS-i Link 20E is possible.
You can recognize the failed AS-i slave simply because the LED assigned to the
slave flashes on the front panel. To see this, you must switch to the slave display
(see Section 1.8.3)
DP/AS-Interface Link 20E
Release 08/2008
C79000-G8976-C235−01
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