Industrial communication networks. Fieldbus specifications - Data-link layer service definition. Type 18 elements1 Scope 1. 1 Overview This standard provides common elements for basic time critical and non time critical messaging communications between devices in an automation environment and material specific to Type 18 fieldbus. The term time critical is used to represent the presence of a time window, within which one or more specified actions are required to be completed with some defined level of certainty. Failure to complete specified actions within the

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holding and storing mooring ropes on a single drum