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AS-Interface Version 2.1 Introduction
8 APG-02 Leuze electronic
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In Versions 2.0 and earlier, AS-Interface supports 4 bits of input data (data from the field to the
host) and 4 bits of output data (data from the host to the field) per slave. With Version 2.1 AS-
Interface slaves, one bit of the output data is used to differentiate between so-called A slaves
and B slaves. A Version 2.1 AS-Interface slave thus supports 4 bits of input data and 3 bits of
output data. This means, when fully expanded, up to 248 bits of input data and 186 bits of out-
put data.
As of Version 2.1, an address can be assigned twice, e. g. address 15A and 15B. In the field,
this means that the data for slave 15A are written and read in the first cycle and the data for
slave 15B in the following cycle, followed again by slave 15A. This increases the cycle time for
slaves A and B to maximum 10 ms. The cycle time of conventional slaves remains unchanged,
as these are queried in every cycle.
If an AS-Interface slave is used which does not support Version 2.1, an
address may be assigned only once .