Monitoring Data Types - Analog Outputs
- Last UpdatedAug 04, 2025
- 2 minute read
This table defines the Plant SCADA variable address required for the specified DNP3 data types.
|
Address |
Plant SCADA Type |
DNP3 Type |
Description |
|---|---|---|---|
|
AO<n>.Val - or - AO<n>.Val.Long |
LONG |
Analog Output Value (32 bit) Object 40 Variation 1 |
R/O Current value of Analog Output. (32bit value) |
|
AO<n>.Val |
LONG |
Analog Output Value (16 bit) Object 40 Variation 2 |
R/O Current value of Analog Output. (16bit value) |
|
AO<n>.Val.Float |
REAL |
Analog Output Value (float) Object 40 Variation 3 |
R/O Current value of Analog Output. (16bit value) |
|
AO<n>.Val.QUAL |
LONG |
Analog Output Quality |
OPC quality of point converted from value of flags. |
where:
-
n = Point index number (range from 0 to 2048)
-
R/O = read only
-
W/O = write only
-
R/W = read or write
Advanced monitoring data types - analog outputs
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 |
|---|---|---|---|
|
AO<n>.Stat |
BYTE |
Analog Output Status Status byte Object 40 Variations 1,2,3 |
R/O. Status data related to Value |
|
AO<n>.Stat.Online |
DIGITAL |
Analog Output Status Online bit Object 40 Variations 1,2,3 |
R/O. Bit 0 of Status byte If Offline, command will not be successful 0=Offline, 1=Online |
|
AO<n>.Stat.Restart |
DIGITAL |
Analog Output Status Restart bit Object 40 Variations 1,2,3 |
R/O. Bit 1 of Status byte Originating field device has been restarted. 0=normal, 1=Restart |
|
AO<n>.Stat.CommLost |
DIGITAL |
Analog Output Status Communication Lost bit Object 40 Variations 1,2,3 |
R/O. Bit 2 of Status byte If comms lost, command will not be successful 0=normal, 1=Lost |
|
AO<n>.Stat.RemForced |
DIGITAL |
Analog Output Status Remote Forced Data bit Object 40 Variations 1,2,3 |
R/O. Bit 3 of Status byte Originating field device is in control 0=normal, 1=Forced |
|
AO<n>.Stat.SelPend |
DIGITAL |
Analog Output Status Plant SCADA – Object Selected in RTU |
R/O. Bit 5 of Status byte This device is in control 0=not selected, |
|
AO<n>.Stat.WrtPend |
DIGITAL |
Analog Output Status Plant SCADA – Select Initated in RTU |
R/O. Bit 6 of Status byte This device is in control 0=not initiated, |
|
AO<n>.Stat.WrtFail |
DIGITAL |
Analog Output Status Plant SCADA – Problem in SELECT/OPERATE sequence |
R/O. Bit 7 of Status byte This device is in control 0=normal, |
|
AO<n>.CtrlStat |
BYTE |
Analog Output Control Status Status byte Object 41 Variations 1,2,3 |
R/O. Status of Control Operation. 0=Request accepted, initiated or queued 1= Request rejected – OPERATE received after SELECT had already timed-out 2= Request rejected – OPERATE received without receiving matching SELECT 3= Request rejected – Formatting errors in control request (Select, Operate or Doperate) 4= Request rejected – Control Operation not supported for this bit 5= Request rejected – Queue full or point already active 6= Request rejected – Control hardware problems 7-127=Undefined. |
where:
-
n = Point index number (range from 0 to 2048)
-
R/O = read only
-
W/O = write only
-
R/W = read or write