IEC 61158-5-21 : 1.0已作废
INDUSTRIAL COMMUNICATION NETWORKS - FIELDBUS SPECIFICATIONS - PART 5-21: APPLICATION LAYER SERVICE DEFINITION - TYPE 21 ELEMENTS
出版：International Electrotechnical Committee
专家解读视频
Offers the common elements for basic time-critical and non-time-critical messaging communications between application programs in an automation environment as well as material specific to the Type 21 protocol.
DS EN 61158-5-21 : 2012 - Identical
DIN EN 61158-5-21 : 2013 - Identical
NEN EN IEC 61158-5-21 : 2012 - Identical
NF EN 61158-5-21 : 2013 - Identical
NBN EN 61158-5-21 : 2012 - Identical
CEI EN 61158-5-21 : 2013 - Identical
BS EN 61158-5-21 : 2012 - Identical
PN EN 61158-5-21 : 2012 - Identical
