Safety-based slave for an actuator - sensor - interface (as - i) a system

摘要

The present invention relates to a failsafe slave (10) for an actuator - sensor - interface (as - i) a system (1), wherein the data between a master (4) and the slave (10) via a data bus (6) are transmitted, wherein the master (4) the slave (10), calls up cyclically and the slave (10) then its data in the data bus (6), and a safety monitor (8) to the data bus (6) is coupled to the state of the slaves (10) is monitored, and wherein a safety sensor mechanism (12) of the slave (10) in a two-channel mode provides a sensor signal which controls a switching network, which is a predetermined and at least four bits wide bit by bit code word (26) in accordance with the signals from the safety sensor mechanism (12) switches through, and wherein at least one sensor conduit (14) via the switching network the switching through of only a single bits (2.1) of the predetermined code word (26) and controls a different sensor conduit (16) the connection of at least one bit (2.2) of the predetermined code word (26), and wherein the single bit (2.1) in the code word (26) is adjacent to the at least one bit (2.2), so that the two bits (2.1, 2.2) in the case of the transmission via the data bus (6) are arranged one behind the other, and wherein within the same cycle in addition to the two-channel sensor signal at least one additional information (34) of the safety sensor mechanism (12) by at least one bit (2.3, 2.4) of the code word (26) is transferable.