Industrial communication networks. Fieldbus specifications - Application layer protocol specification. Type 3 elements1 Scope 1. 1 General The Fieldbus Application Layer (FAL) provides user programs with a means to access the fieldbus communication environment. In this respect, the FAL can be viewed as a window between corresponding application programs. This standard provides common elements for basic time critical and non time critical messaging communications between application programs in an automation environment and material specific to Type 3 fieldbus. The

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