Siemens SIMATIC ET 200SP Manual page 106

Using the command interface
9.4 Description of the AS-i commands
General structure of the receive buffer
The basic structure of the receive buffer for commands is shown below. The length of the
response data depends on the respective command.
Some commands do not supply any response data. In this case, there is no receive buffer.
Table 9- 5 Basic structure of the receive buffer
Byte
0
1
...
General operating state of the AS-i slave address
If an AS-i slave must be addressed in a command or in a response, it must be addressed as
follows:
Table 9- 6 Structure of the AS-i slave address
Bit 7 Bit 6
0 0
The Select bit for the selection of the slave type is specified as follows:
● Select bit = 0
AS-i slave with standard-address (0 to 31) or AS-i slave with extended address in
address area A (1A to 31A)
● Select bit = 1:
AS-i slave with extended address in address area B (1B to 31B)
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Meaning
Response data
Response data
Response data
Bit 5 Bit 4
Select bit
Bit 3 Bit 2
Slave address
AS-Interface master CM AS-i Master ST (3RK7137-6SA00-0BC1)
Manual, 07/2017, A5E02655262020A/RS-AD/004
Bit 1 Bit 0