AS-Interface Protocol Implementation
A-4
SIMATIC NET CP 243-2 AS-i Master
C79000-G8976-C142/02
How the AS-Interface cycle time depends on the number of connected slaves
The following formula is used to calculate the AS-Interface cycle time depending
on the number of activated slaves.
T
cycl
= (1 + number of activated slaves) * 156
µ
s
If a pair of slaves using the extended addressing mode (A/B slaves) occupies an
address, this pair is counted as a single slave in the formula. Pairs of A and B
slaves are addressed in every second AS-Interface cycle; in other words, the
calculated cycle time is doubled for these slaves.
The calculated cycle time applies assuming that no frames are repeated, there are
no management calls and all slaves are synchronized.
Содержание SIMATIC NET CP 243-2
Страница 4: ...Preface ii SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 8: ...Contents vi SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 26: ...Technical Description and Installation Instructions 1 18 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 64: ...Access to the Data of the AS i Slaves 3 16 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 68: ...Signaling Errors and Diagnostics in the User Program 4 4 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 128: ...Command Interface 5 60 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 134: ...Dealing with Problems Error Displays 6 6 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 142: ...Notes on the CE Mark C 2 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...
Страница 148: ...Glossary Glossary 4 SIMATIC NET CP 243 2 AS i Master C79000 G8976 C142 02 ...