Siemens SIMATIC NET CP 142-2, Manual, Page: 52 / 84

B8976111/02 AS-i Master Module CP 142-2
4-15
4.2.1.14 Change_Slave_Address
Meaning
With this call, the slave address can be changed.
This call is mainly used to add a new AS-i slave with the default address 0 to the AS-i system. 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 an AS-i slave with address 0 cannot be
connected at the same time.
3. The new slave address must have a valid value.
4. No AS-i slave with the new slave address must already exist.
Note:
When changing the slave address, the AS-i slave is not reset, in other words the output
data of the slave are retained until new data arrive for the new address.
Structure of the job data in the send buffer
Bit 7 Bit 0
Byte 0 0 H D H
Byte 1 Old slave address
Byte 2 New slave address