Patent ID: 8291142

Claim:
A method for process control of an automation system in which data is exchanged between a network ( 410 ) formed for transmitting Ethernet telegrams and a lower-level bus system ( 420 ) via a bus coupler ( 500 ), wherein the bus coupler ( 500 ) is connected via a first interface ( 520 ) to the network ( 410 ) and via a second interface ( 530 ) to the lower-level bus system ( 420 ), and wherein process data is read in and/or output by at least one bus node ( 610 , 620 , 630 ) of the lower-level bus system ( 420 ), the method comprising: receiving an Ethernet telegram ( 800 ) via the first interface ( 520 ) of the bus coupler ( 500 ); converting the received Ethernet telegram ( 800 ) into an internal data telegram ( 900 ) that has a shorter data length than the received Ethernet telegram ( 800 ), wherein certain information of the Ethernet telegram are not incorporated into the internal data telegram during the conversion such that, after the conversion, the internal data telegram is not an Ethernet telegram; and outputting the internal data telegram ( 900 ) via the second interface ( 530 ) of the bus coupler ( 500 ) to the bus node ( 610 , 620 , 630 ) of the lower-level bus system ( 420 ), wherein the lower-level bus system uses a unique protocol instead of an Ethernet protocol.