IEC 61158-5-20 Ed. 1.0被替代
Industrial communication networks - Fieldbus specifications Part 5-20: Application layer service definition - Type 20 elements
出版：International Electrotechnical Committee
專家解讀視頻
It 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 20 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 time window risks failure of the applications requesting the actions, with attendant risk to equipment, plant and possibly human life. It includes the following significant changes with respect to the previous edition deletion of the former Type 6 fieldbus, and the placeholder for a Type 5 fieldbus data-link layer, for lack of market relevance; addition of new types of fieldbuses; division of this part into multiple parts n
BS EN 61158-5-20:2008 - Identical
PN EN 61158-5-20:2008 - Identical
OVE/ONORM EN 61158-5-20:2008 - Identical
NEN EN IEC 61158-5-20:2008 - Identical
DIN EN 61158-5-20 (2008-09) - Identical
I.S. EN 61158-5-20:2008 - Identical
