Communication and/or Control Apparatus and Method for Detecting Locking States in Same

摘要

The invention concerns a method for detecting locking states in communication and/or control appliances (SG_i) dispersedly networked together by a data bus ( 2 ). Said method consists in comparing a message currently transmitted by a communication and/or control appliance (SG_i) to a previously transmitted message and determine the absence of a locking state of the communication and/or control appliance (SG_i) if the messages are different and in encoding a message counter with the transmitting communication and/or control appliance (SG_i) in the transmitted message if the messages are identical and decoding the message counter in a communication and/or control appliance (SG_i) receiving the message and determining the absence of locking state at the communication and/control appliance (SG_i) if the value of the message counter has changed relative to a previous value of the message counter of a previously transmitted message, and determining a locking state of the communication and/or control appliance (SG_i) if the message counter value has not changed after a specific waiting time (t_w).