This paper addresses the problems concerning the faulttolerant distributed replication of a controlling application in an automated system. The Manufacturing Message Specificafion ( M M S ) is used as a communication protocol between the controlling application ( M M S client) and the automated industrial equipment (MMS servers). A distribufed systems toolkif @ST) is used to manage the replication of the controlling application. We identify potential obstacles in the MMS environment when passive client replication is used. We suggest methods that the recovering client can use to overme these obstacles. The solutions and alternatives proposed are discussed with respect to their conformance to tbe MMS standard.
Event management is a mechanism useful for the specification of the system behaviour when specified conditions occur. The ability to represent reality in manufacturing systems may be enhanced by the availability of a well structured and powerful event management facility. We compare concepts like process, event, object, used to manage events, in the CIMOSA and CCE frameworks, two manufacturing modelling environments. We identify the relationship between such concepts. The two event management models are analysed in detail, they are compared and their differences are identified.
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