Abstract: Using the maximum algebra method frequently\|used in discrete event dynamic systems, we considered the dynamic behavior of the network process data on a mutifunction vehicle bus (MVB). A mathematical model based on the process data communication on MVB  was constructed, the nonblock condition of MVB network process data communication was analyzed and verified by mathematical calculation and simulation experiment under the condition of introducing
 periodic input control, and the possible blocking problem in process data communication was solved. The experimental results show whether process data transmission system is blocked depends on the value of the time matrix of process date and the time interval of bus manager reading main frame on the communication memory, the value of the latter is greater than or equal to the maximum value of the former, the whole network will enter the periodic steady state with a period of 1, 
which effectively improves the reliability of process data communication of the MVB network.

Key words: process data, maximum algebra, mutifunction vehicle bus (MVB), reliability