Siemens DP/AS-Interface Link 20E Manual page 142

AS-Interface Protocol Implementation Conformance Statement (PICS)
How the AS-i cycle time depends on the number of connected slaves
The AS-i cycle time can be calculated using the following formula:
= (1 + number of activated AS-i slaves) x 156 ms
t
cycl
Note:
If two 2 AS-i slaves with extended addressing mode occupy the same address (for
example, address 5A and address 5B), this slave pair is calculated as one 1 AS-i
slave in the above formula. The reason for this is that slave pairs with the same
address are only addressed in every second cycle. The cycle time in the formula
above is therefore doubled for such slaves.
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142
DP/AS-Interface Link 20E
Release 11/2002
C79000-G8976-C138–04