Siemens SIMATIC NET Instrukcja Obsługi Pobierz pdf (Strona 94)

Command Interface

5-26

SIMATIC NET CP 243-2 AS-i Master

C79000-G8976-C142/02

5.2.14 Change_AS-i_Slave_Address

Purpose of the Command

With this call, the address of an AS-i slave can be modified.

This call is mainly used to add a new AS-i slave with the default address 0 to the

AS-Interface. In this case, the address is changed from the old slave address (0)

to the new slave address.

This change can only be made when the following conditions are fulfilled:

1. A slave with the “old slave address” exists.

2. If the old slave address is not equal to 0, then a slave with address 0 cannot be

connected at the same time.

3. The “AS-i slave address new”

must have a valid value.

4. An AS-i slave with “slave address new” must not exist.

Note

When the slave address is changed, the AS-i slave is not reset, in other words the

output data of the AS-i slave are retained until new data are received at the new

address.

Structure of the Job Data in the Send Buffer

Bank Byte Meaning

2 0 Command number: 0D

2 1 Slave address old

2 2 Slave address new

Structure of the Job Data in the Receive Buffer

Bank Byte Meaning

2 0 Echo of the command number: 0D

2 1 Command status

1 2 ... 89 90 91 92 93 94 95 96 97 98 99 ... 149 150

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