ProSoft Technology MVI46-DNP - Manual (Page 71)

Reference MVI46-DNP ♦ SLC Platform
Master/Slave Communication Module
ProSoft Technology, Inc. Page 71 of 143
August 23, 2007
The SLC transfers data of this type to the module using COP command. The
module maintains two values for each counter point: a current running value and
a frozen value. The DNP master must send the freeze command to the module in
order to transfer the current running values to the frozen area. Additionally, the
DNP master can send a freeze/clear command to the module. This causes the
frozen counter area to be updated with the current running values, and then the
current running values are reset to zero. The values will only be zeroed in the
module's M1: file and not in the SLC.
Data from IED units can also be placed
in the DNP counter data area. Commands in the command list must specify the
DNP database address (point number) where the data will be placed. Both frozen
counter and counter data values obtained from the IED units are placed in the
counter data. The frozen counter data is only updated on a request from the
remote DNP master. The counter data from the IED units can be read by the
remote DNP master unit connected to the DNP slave port.
The following shows a data flow diagram for the counter data:
All the current running counter data is transferred from the SLC to the module
using M1: file elements 384 to 511. This provides for a maximum number of 64
counter values.