PRS-7910
42 PRS-7910
the user.
The user can configure the user-defined communication table through the PRS IED Studio
configuration tool auxiliary software. The object groups “Binary Input”, “Binary Output”, “Analog
Input” and “Analog Output” can be configured according to the practical engineering demand.
9.5.4.4 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”.
9.5.4.5 Binary Output Configuration
The remote control signals, logic links and external extended output commands can be configured
into the “Binary Output” group. The supported control functions are listed as below.
Table 9.5.2 control functions
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.
9.5.4.6 Unsolicited Messages
This relay does not transmit the unsolicited messages if the related logic setting is set as “0”. If the
unsolicited messages want to be transmitted, the related logic setting should be set as “1” or the
DNP3.0 master will transmit “Enable Unsolicited” command to this relay through “Function Code
20” (Enable Unsolicited Messages). If the “Binary Input” state changes or the difference value of
the “Analog Input” is greater than the “deadband” value, this device will transmit unsolicited
messages. If the DNP3.0 master needs not to receive the unsolicited messages, it should forbid
this relay to transmit the unsolicited messages by setting the related logic setting as “0” or through
the “Function Code 21” (Disable Unsolicited Messages).
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