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What is DNP3?

DNP3 is a protocol used commonly in utilities like water and electric companies. It is commonly used to connect to one master station (device) that is then connected to several other devices. This creates a web of devices without taxing the network too much. DNP3 is similar to the Modbus protocol in that is it more device agnostic, but it's newer, more robust, and because of that, more complex. You can use it to connect to many modern devices, check your documentation to see whether your device supports DNP3.

Connecting to a Device

Ignition's DNP3 driver can connect directly to any devices that support Ethernet communication through the master station. It is important to make a new device connection for each of the outstations (remote devices), setting the source and destination addresses for each in Ignition's device connection.

  1. Go to the Configure section of the Gateway webpage.

  2. Scroll down and select OPC-UA Server > Devices.

  3. On the Devices page, find the blue arrow and click on Create new Device.

  4. On the Add Device Step 1: Choose Type page, select DNP3 Driver, and click Next.

  5. On the New Device page, leave all the default values and type in the following fields:

    Name: DNP3
    Hostname: type the IP address, for example 10.20.8.51

  6. You can check the box for Show advanced properties? to see the additional settings, but you can keep all the defaults.
     
  7. Click Create New Device.
    The Devices page is displayed showing the DNP3 device is successfully created and added to Ignition. The Status will show as Disconnected and then Connected or Idle, depending on the status of the device.


On this page ...


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Connecting to DNP3 Devices

 

Connection Settings

Connection Settings

General

Name

The name of this DNP3 device connection.

Description

Device connection description (optional). Can be used to provide any useful information / comments about this connection.

Enabled

If True (checked), the connection is enabled; if False ( unchecked), the connection is disabled.

Main

Hostname

The IP Address of the device.

Port

The port to use when connecting to a DNP3 device. The default port is 20000.

Source Address

The address of the master station, default is 3.

Destination Address

The address of the outstation, default is 4.

Integrity Poll Interval

The interval at which to perform an integrity poll, in millis, default is 3,600,000.

Direct Operate Enabled

When true, the Direct-Operate function code is used on a write, otherwise Select-Operate is used, default is true.

Unsolicited Messages Enabled

When true, the outstation may send unsolicited messages for Class 1, 2, and 3 data, default is false.

Advanced

 

Message Fragment Size

The maximum size of a message fragment in the application layer, default is 249.

Message Timeout

The amount of time to wait for a message response from the outstation, default is 5,000.

Retries

The number of retries on a message timeout, default is 0.

Link Layer Confirmation

When true, a link layer confirmation will be required from the outstation when sending messages, default is false

Default Outstation Conformance level

The default DNP3 Application Layer level subset to use when communicating with the outstation.

Default Value Types

 

Analog Input Points

The default value type to use when reading an analog input point. default is INTEGER

Analog Input Frozen Points

The default value type to use when reading a frozen analog input point. default is INTEGER

Analog Output Points

The default value type to use when reading/writing an analog output point. defaultis INTEGER

Counter Points

The default value type to use when reading a counter point. default is INTEGER

Counter Frozen Points

The default value type to use when reading a frozen counter point. default is INTEGER

Binary Input Points

The default value type to use when reading a binary input point. default is WITH_FLAGS

Double-Bit Binary Input Points

The default value type to use when reading a double-bit binary input point. default is WITH_FLAGS

Binary Output Points

The default value type to use when reading a binary output point. default is WITH_FLAGS

Notes

  • Source Address and Destination Address: These addresses are assigned to the computers and should be the same across all settings, because of this the settings in Ignition and the settings in the device are the opposite of each other. For example, if the device is configured with an address of 4 and Ignition has an address of 3: 
    • the settings in Ignition should have the Source Address set to 3 and the Destination Address set to 4.
    • the settings in the Device should have the Source Address set to 4 and the Destination Address set to 3.
  • Unsolicited messages enabled property: setting this property to True (checking the box) allows the outstation to send unsolicited messages to Ignition. This means that Ignition will connect to the outstation, but not request any data from it.  Ignition waits for the outstation to send data.   Not all devices support this option; those that do need to be configured to use it. Please refer to your device's documentation for more information. 

Internal Indicators

Each response received from a connected outstation will contain an Internal Indication (IIN) bit field.  This field indicates certain states or error conditions in the outstation. IINs are mapped to read-only points, indicating the following:

  • Broadcast message received (Broadcast)
  • Additional Class 1, 2, or 3 event data is available (Class 1 Events, Class 2 Events, Class 3 Events)
  • Time synchronization required in the outstation (Need Time)
  • Some output points are in local mode (Local Control)
  • An abnormal condition exists (Device Trouble)
  • The outstation device has restarted (Device Restart)
  • Function code not implemented (No Func Code Support)
  • Object Unknown (Object Unknown)
  • Request parameter error (Parameter Error)
  • Outstation event buffer overflow (Event Buffer Overflow)
  • An operation is already executing (Already Executing)
  • Configuration corrupt (Config Corrupt)

Terminology

  • unsolicited response: An Application Layer message from an outstation to a master for which no explicit request was received.  The request is implied by the act of a master enabling unsolicited reporting of various points within an outstation.
  • integrity poll: Requests all event data, followed by the static data of all points assigned to one of the four classes (static Class 0 or event Class 1, 2, or 3).
  • DNP3TIME: Univeral Coordinated Time (UTC) time expressed as the number of milliseconds since the start of January 1, 1970.  The effective date for using the UTC time base is January 1, 2008.  Prior to this, DNP3 did not require a specific time reference.

 

Browsing DNP3 Points

When the driver (master) connects to a device (outstation), an integrity poll is performed. Any DNP3 objects returned in the response that fall under the Point Type categories listed in the table on the right are mapped to the OPC server with the appropriate index. (For example, g40v1i2 corresponds to an AnalogOutput point, variation 1, index 2.)

To see the points mapped, you can go to the Designer, open the OPC Browser, and drill down to the DNP3 connection node.

Point Types

Type Name

Group

Supported Variations

 
SinglBitBinaryInput1

1 - Packed format

2 - With flags
DoubleBitBinaryInput3

1 - Packed format

2 - With flags
BinaryOutput10

1 - Packed format

2 - With flags
Counter20

1 - 32-bit with flags

2 - 16-bit with flags

5 - 32-bit

6 - 16-bit

FrozenCounter21

1 - 32-bit with flags

2 - 16-bit with flags

5 - 32-bit with flags and time

6 - 16-bit with flags and time

9 - 32-bit

10 - 16-bit

AnalogInput30

1 - 32-bit with flags

2 - 16-bit with flags

3 - 32-bit

4 - 16-bit

5 - Float with flags

6 - Double with flags

FrozenAnalogInput31

1 - 32-bit with flags

2 - 16-bit with flags

3 - 32-bit with time of freeze

4 - 16-bit with time of freeze

5 - 32-bit

6 - 16-bit

7 - Float with flags

8 - Double with flags

AnalogOutput

40

1 - 32-bit with flags

2 - 16-bit with flags

3 - Float with flags

4 - Double with flags

OctetString1100 - 255 


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About DNP3 Addressing

 

 

Aliased Points

Aliased points allow the user to assign meaningful names and descriptions to DNP3 points. They are also useful for addressing any points that were not returned by the initial integrity-poll on connection.

Point Address

The group, variation, and index that fully describe a point.  A full address consists of all three parts:

  • Group – An integer prefixed with g.  For example, g40
  • Variation – An integer prefixed with v. For example, v2
  • Index – An integer prefixed with i. For example, i5

Example: g30v1i20

PathA “/” separated folder hierarchy in which to create the aliased point.
 Example: Facility1/Voltage
Description A user-defined description of the point mapping.

 


 

 

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