summing frame method

The summing framemethod is a transmission method in field buses. In this method, the control systems and all sensors and actuators are connected to each other in a logical ring topology. In the summing frame method, the data flow is in one direction as in a shift register, which has led to the name shift register ring. The data is shifted sequentially from station to station through the entire ring. The transmitted data block contains the data for all participants and has a relatively small overhead consisting of the loopback, control data, and checksum field. This data frame, which contains all the subscriber data, is called the sum frame. The summation frame begins with the loopback. When this has been pushed through the entire ring and is present in the receive register, all subscriber data is located at the correct subscriber. A transfer pulse synchronizes the transfer of the subscriber data to the actuators and the transfer of the sensor data to the shift register ring. As the number of stations increases, so does the proportion of user data and the length of the summation frame, which leads to an increase in the cycle time. With the Interbus, this cycle time is 1.8 ms for a

Englisch:	summing frame method
Updated at:	26.02.2006
#Words:	205
Links:	frame, method, transmission, field, indium (In)
Translations:	DE
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