Prosoft-technology MVI69-DNP Manual de usuario descargar pdf (Pagina 45)

Ladder Logic MVI69-DNP ♦ CompactLogix or MicroLogix Platform

DNP 3.0 Master/Slave Communication Module

ProSoft Technology, Inc. Page 45 of 129

November 3, 2008

3.2 Special Objects

These objects utilize some of the advanced features the module provides. If your

application does not require the object, then you need not declare an instance of

the object. Each of the objects and associated function are discussed in the

following topics.

3.2.1 DNPCROB Object

The DNPCROB object is used in conjunction with the command control block

9901. This block sends a pulse output command to a single-point relay or a

trip/close relay. All the parameters required for each command to be used in the

block are contained in the object. Up to six of these objects can be contained in a

single block 9901 command. The structure of the object is shown in the following

example:

Tag Name Data Type Description

Port_Flag INT This field is ignored in the current implementation

Slave_ID INT

This is the DNP slave address to send the command

Object INT This should always be 12

Variation INT This should always be 1

Function INT

This should be 3, 5 or 6 depending on the write

method

Address INT

This is the binary output starting point to operate in

the slave

Control_Code INT This determines the CROB operation

Pulse_Count INT This determines the number of pulses (0-255)

Pulse_On INT This determines the pulse on time

Pulse_Off INT This determines the pulse off time

3.2.2 DNPEventMsg Object

The DNPEventMsg object stores event messages received on the DNP master

port and passed to the processor. The structure of this object is shown in the

following example:

Tag Name Data Type Description

DevIndex INT Logical slave device index in module

IEDPoint INT Logical point address in IED database

DNPPoint INT Logical point address in DNP database

SlaveAddress INT Remote slave address that generated event

PointNum INT Point address in remote device

Object INT DNP object number for point

Variation INT DNP variation for event

LowTime INT Least-significant word of 48-bit DNP time

HighTime DINT Most-significant double-word of 48-bit DNP time

Value DINT Value for event

This information is passed to the processor from the module in a special read

block with an identification code of 9903. Each block can send up to 20 event

messages. Ladder logic must handle the receipt of this special data block and to

place the data received into controller tags.

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