Communication Protocol
PRS-7367 323
Input” and “Analog Output” can be configured according to the practical engineering demand.
9.5.4.3 Analog Input and Output Configuration
To the analog inputs, the attributes “deadband” and “factor” of each analog input can be configured
independently. To the analog outputs, only the attribute “factor” of each analog output needs to be
configured. If the integer mode is adopted for the data formats of analog values (to “Analog Input”,
“Object Variation” is 1, 2 and 3; to “Analog Output”, “Object Variation” is 1 and 2.), the analog
values will be multiplied by the “factor” respectively to ensure their accuracy. And if the float mode
is adopted for the data formats of analog values, the actual float analog values will be sent directly.
The judgment method of the analog input change is as below: Calculate the difference between
the current new value and the stored history value and make the difference value multiply by the
“factor”, then compare the result with the “deadband” value. If the result is greater than the
“deadband” value, then an event message of corresponding analog input change will be created.
In normal communication process, the master can online read or modify a “deadband” value by
reading or modifying the variation in “Group34”.
9.5.4.4 Binary Output Configuration
The remote control signals, logic links and external extended output commands can be configured
into the “Binary Output” group.
To an extended output command, if a selected command is controlled remotely, this command
point will output a high ~ level pulse. The pulse width can be decided by the “On ~ time” in the
related “Binary Command” which is from the DNP3.0 master. If the “On ~ time” is set as “0”, the
default pulse width is 500ms.
9.5.4.5 Class Configuration
If the DNP3.0 master calls the Class0 data, this relay will transmit all actual values of the “Analog
Input”, “Binary Input” and “Analog Output”. The classes of the “Analog Input” and “Binary Input”
can be defined by modifying relevant settings. In communication process, the DNP3.0 master can
online modify the class of an “Analog Input” or a “Binary Input” through “Function Code 22” (Assign
Class).
To Next Page
Loading...