| 摘要 |
The invention relates to a method for cyclical communication between communications stations (1, 2, 3) which are provided for controlling or surveying a technical process (50), through a bus (4). According to the invention, communications relations (12, 13, 21, 31) which are provided for the communication stations (1, 2, 3) are executed during each bus cycle of predetermined duration (Deltat) and if a communications relation is disturbed, its repetition (21W) is scheduled for a succeeding bus cycle and the disturbed communications relation is acknowledged with a special acknowledgement code.
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