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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:

 Exactly one slave has failed.

 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.

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Siemens SIMATIC NET Manual de servicio Pagina 130