Siemens SIMATIC Distributed I/O System DP/ASi Link Manual de servicio descargar pdf (Pagina 46)

The Master Mode – Commands, Sequence, Programming

4-6

SIMATIC NET AS-Interface – Introduction and Basic Information

C79000-G8976-C089/03

– 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.

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Siemens SIMATIC Distributed I/O System DP/ASi Link Manual de servicio Pagina 46