Siemens MICROMASTER 440 Operating Instructions Manual page 151

Issue 10/06
Example of configuration
1
MICROMASTER with the addresses 0, 1, 3, 5, 7 and 21
Nodes 0 and 1 are signalled twice as often as others
Fig. 3-41 Circulating list (Example of configuration)
The length of a cycle time is determined by the time needed for the sequential
occurrence of data exchange with the individual nodes.
0 0
Fig. 3-42 Cycle time
Due to inconstant reply delay and processing times, the cycle time is not fixed.
The STX start character (= 02 hexadecimal) by itself is not sufficient for the slaves
to clearly identify the start of a telegram because the bit combination
02/hexadecimal can also occur in the net characters. For this reason, a no-
character start interval of at least 2 character run-times before the STX is specified
for the master. The start interval is part of the task telegram.
MICROMASTER 440 Operating Instructions
6SE6400-5AW00-0BP0
3
Master
7 3
Cycle time
1
0
21
1
7
1
5
0
5 21
0
1
Telegram run time for reply from node 1
Reply delay time from node 1
Telegram run time for task for node 1
Processing time in the master
3 Functions
0
1
3
5
0
1
7
21
Circulating list
in the master
0
t
0
151