Technical data

The Master Mode – Commands, Sequence, Programming
4-6
SIMATIC NET AS-Interface – Introduction and Basic Information
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– The list of activated AS-i slaves (LAS)
The LAS specifies which AS-i slaves were activated by the AS-i master. I/O
data are only exchanged with activated AS-i slaves.
S I/O data
The process input and output data.
S Configuration data
These are non-volatile data (e.g. stored in an EEPROM), which are available
unchanged even following a power failure.
– Expected configuration data
These are selectable comparison values which allow the configuration data
of the detected AS-i slaves to be checked.
– List of permanent AS-i slaves (LPS)
This list specifies the AS-i slaves expected on the AS-i cable by the AS-i
master. The AS-i master checks continuously whether all the AS-i slaves
specified in the LPS exist and whether their configuration data match the
expected configuration data.
The AS-i slave has the following structures:
S I/O data
S Parameters
S Actual configuration data
The configuration data include the I/O configuration and the ID codes of the
AS-i slave.
S Address
The AS-i slaves have address “0” when installed. To allow a data exchange, the
AS-i slaves must be programmed with addresses other than “0”. The address
“0” is reserved for special functions.