what's the meaning of DNP DB ADDRESS IN THE DNP.CFG?
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zhou_7
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Sunday 11 February 2007 6:09:02 pm |
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what's the meaning of DNP DB ADDRESS IN THE DNP.CFG?
MVI56-DNP
follow is copyed from the dnp.cfg file
[DNP Master Commands]
# This section contains the list of commands to process on the master port.
# Node addresses present in the command list must have an entry in the
# [DNP Slave List]. Commands with nodes not present in the list will not be
# executed.
#
START
# 1 2 3 4 5 6 7 8 9 10
#Flags/ Node Data Data Cmd Device Point DNP DB IED DB Poll
#Enable Address Object Variation Func Address Count Address Address Interval
6 2 1 0 1 0 -20 32 0 0
6 2 30 0 1 0 -10 10 0 0
6 2 60 5 1 0 60 0 0 0
END
but i don't know the meaning of the DNP DB ADDRESS, why there is 32?10?0 above? and if i want to read some counter from the slave, how to calc this parameter?
thanks ,
PS:sorry for my english
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jsanders
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Thursday 01 March 2007 5:00:16 pm |
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RE:what's the meaning of DNP DB ADDRESS IN THE DNP.CFG?
Page 26 of the MVI56-DNP User Manual says this:
DNP DB Address
This parameter defines the starting location in the DNP database to be used with the command. If the parameter has a value of –1, the DNP database is not used with the point.
The MVI56-DNP module has two DNP serial ports, a Master port for polling DNP Slaves and a Slave port for passing data to a remote DNP Master. Each port has it's own, separate database areas in the module's internal memory space. The Slave port uses only the DNP database. The Master port normally uses the IED database but may also directly access the Slave port's DNP database.
The DNP Slave database is that portion of module memory reserved to hold DNP data for the module's Slave port. Data in this database can be put there by whatever remote DNP Master is attached to the Slave port; by the ControlLogix CPU, or by the module's own DNP Master driver.
DNP Master commands allow data being read in through the port to be stored in the DNP and/or IED databases. This allows data from the Master port, which is normally stored in a separate IED database, to be stored directly into the DNP Slave database directly, without the need to move the data between the databases via ladder logic.
The values contained in the command, if not -1, will designate a starting offset into the Binary Input (BI), Analog Input (AI), Counter, Binary Output (BO), or Analog Output (AO) portions of the DNP Slave database. Which datatype this value refers to is controlled by the Object/Function/Variation parameters used in the command.
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