October 2018
Intermediate to advanced
962 pages
40h 41m
English
Content preview from Industrial Communication Systems
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58-6 Industrial Communication Systems
(low priority, usually cyclic data) unless the previous response indicates that there is high-priority data
available (by setting the access demand ag), in which case the controlling station requests Class 1 data. In
this manner, the controlled station is fundamentally in control of the correct sequence of reporting of data
to the controlled station. In DNP3, the outstation always replies with exactly the data that the master has
requested: e master has full control over what will be sent. In order for the correct data reporting to be
preserved in DNP3, the master must only request static data (the current value of inputs) if it is also request-
ing all buered events for those same inputs in the same ...
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