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E149701
C-3
C: DNP Mapping
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
Electro
Industries/GaugeTech
The Leader In Power Monitoring and Smart Grid Solutions
• The Write function (code 02) provides a means of clearing the Device restart bit in
the Internal Indicator register, only. This is mapped to Object 80, point 0 with vari-
ation 1. When clearing the restart-device indicator, use qualifier 0. C.7: DNP Object
Point Map on page C-6, shows the supported frames for this function.
• The Select function (code 03) provides a means of selecting a Control Relay Output
Block (CROB) (Object 12). This function can be used to select the Energy or
Demand counters, or to select a Relay if there are any installed in the device.
• The Operate function (code 04) provides the means for repeating the operation of a
previously selected CROB (Object 12) device. This function can be used to reset the
Energy or Demand counters, or to operate a Relay if there are any installed in the
device. The device must have been previously selected by the request immediately
preceding the Operate command, and be received within the specified time limit
(the default is 30 seconds). This function uses the same operation rules as a Direct
Operate function.
• The Direct Operate function (code 05) provides the means for the direct operation
of a CROB (Object 12) device. This function can be used for resetting the Energy
and Demand counters (minimum and maximum energy registers) or controlling
relays if there are any installed in the device. The relay must be operated (On) in 0
msec and released (Off) in 1 msec, only. Qualifiers 0x17 or x28 are supported for
writing the energy reset. Sample frames are shown in C.7: DNP Object Point Map
on page C-6.
• The Direct Operate Unconfirmed (or Unacknowledged) function (code 06) is
intended for asking the communication port to switch to Modbus RTU protocol from
DNP. This switching is seen as a control relay mapped into Object 12, point 1 in the
meter. The relay must be operated with qualifier 0x17, code 3 count 0, with 0
milliseconds on and 1 millisecond off, only. After sending this request the current
communication port will accept Modbus RTU frames only. To make this port go back
to DNP protocol, the unit must be powered down and up, again. C.7: DNP Object
Point Map on page C-6 shows the constructed frame to perform DNP to Modbus
RTU protocol change.
NOTE:
This function has no effect when requested via a Network card.
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