Siemens CP 243-2 - Manual (Page 130)

Dealing with Problems / Error Displays
6-2
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
6.1 Replacing a Defective AS-Interface Slave/Automatic Address
Programming
Simple Replacement of AS-Interface Slaves
Using the automatic address programming function, you can replace failed
AS-Interface slaves extremely simply.
Note
Remember that “automatic address programming” is only possible in the
following situations:
– The CP 243-2 is in the protected mode.
– The AUTO_ADDR_ENABLE flag is set to 1.
and
– Only one AS-Interface slave has failed.
The sections below explain how to replace failed AS-Interface slaves using the
automatic address programming function.
Detecting Defective AS-Interface Slaves
If the AUP LED is lit (only in the protected mode) this indicates the following:
S
Exactly one slave has failed.
S
Automatic address programming by the CP 243-2 is possible.
You can recognize the failed AS-Interface slave simply because the LED assigned
to the slave flashes on the front panel. To do this, you must switch the CP 243-2 to
the slave display (see Section 1.8.2)
You can now replace the defective slave as follows:
Replace the defective slave with an identical slave (same I/O configuration and ID
code extended ID1 code, extended ID2 code) with the address 0 (as supplied).
The CP 243-2 then programs this slave with the address of the original station that
had failed.
The “AUP” indicator then goes off. The CP 243-2 indicates the new slave in the
LED display.