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A AS-Interface Protocol Implementation Conformance Statement (PICS)

118

CP 343−2 / CP 343−2 P AS−Interface Master

Release 08/2008

C79000−G8976−C149−04

Table K-2 PICS, (continued)

No. Comment / Function implemented byM4Function or Call on the Host Interface

(symbolic representation)

6 Support of Combined transaction type 4

integrated

7 Support of Combined transaction type 5

integrated

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:

If 5 or more AS-i slaves are activated:

cycl

= (1 + number of activated AS-i slaves) x 154 ms

If less than 5 AS-i slaves are activated:

cycl

= (1 + number of activated AS-i slaves) x 654 ms

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 addressed only in every second cycle. The cycle time in the formula

above is therefore doubled for such slaves.

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Siemens CM343 Series Manual de servicio Pagina 118