Siemens CP 243-2 - Manual (Page 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
H
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
H
2 1 Command status