Virtual Units - Usurp Data Types
- Last UpdatedAug 04, 2025
- 2 minute read
Note: The following data types are only recommended for experienced users who are familiar with the terminology and methods associated with the DNP 3.0 protocol.
|
Address |
Plant SCADA Type |
DNP3 Type |
Description |
|---|---|---|---|
|
Unit<x>. |
INTEGER |
Request unit active on primary. No Object |
R/W Writing a ‘1’ to this tag will force the unit be active on the primary I/O server. Writing ‘0’ will force the unit be active on the standby I/O server. A read returns the last value written to the tag. This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
|
Unit<x>. |
INTEGER |
Request unit active on standby. No Object |
R/W Writing a ‘1’ to this tag will force the unit be active on the standby I/O server. Writing ‘0’ will force the unit be active on the primary I/O server. A read returns the last value written to the tag. This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
|
Unit<x>. |
INTEGER |
Unit active state on primary. No Object |
R/O Returns 1 if the unit is active on the primary I/O server and 0 if active on the standby I/O server. This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
|
Unit<x>. |
INTEGER |
Unit active state on standby. No Object |
R/O Returns 1 if the unit is active on the standby I/O server and 0 if active on the primary I/O server. This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
|
Unit<x>. |
INTEGER |
True port connection state of primary unit. No Object |
R/O Useful to check if the port, a unit is on, is connected. -1 No peer update This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
|
Unit<x>. |
INTEGER |
True port connection state of standby unit. No Object |
R/O Useful to check if the port, a unit is on, is connected. -1 No peer update This address does not relate to I/O data internal to the device, but relates to data internal to the driver, or an action to be performed by the driver. |
Where:
-
x = device address of the real device as specified in the I/O Device's Address field
-
R/O = read only
-
W/O = write only
-
R/W = read or write