Control 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>.Select.Long |
LONG |
Analog Output Control (32bit) Select Object 41 Variation 1 |
W/O. Selects point to be controlled (the driver will automatically send out the corresponding operate command). (32bit value). |
|
AO<n>.Select |
INTEGER |
Analog Output Control (16bit) Select Object 41 Variation 2 |
W/O. Selects point to be controlled (the driver will automatically send out the corresponding operate command). (16bit value). |
|
AO<n>.Select.Float |
REAL |
Analog Output Control (Float) Select Object 41 Variation 3 |
W/O. Selects point to be controlled (the driver will automatically send out the corresponding operate command). (float value). |
|
AO<n>.SelectOnly.Long |
LONG |
Analog Output Control (32bit) Select Object 41 Variation 1 |
W/O. Selects point to be controlled but does not operate. (32bit value). |
|
AO<n>.SelectOnly |
INTEGER |
Analog Output Control (16bit) Select Object 41 Variation 2 |
W/O. Selects point to be controlled but does not operate. (16bit value). |
|
AO<n>.SelectOnly.Float |
REAL |
Analog Output Control (Float) Select Object 41 Variation 3 |
W/O. Selects point to be controlled but does not operate. (float value). |
|
AO<n>.Operate.Long |
LONG |
Analog Output Control (32bit) Operate Object 41 Variation 1 |
W/O. Activates control operation on previously selected point. (32bit value). |
|
AO<n>.Operate |
INTEGER |
Analog Output Control (16bit) Operate Object 41 Variation 2 |
W/O. Activates control operation on previously selected point. (16bit value). |
|
AO<n>.Operate.Float |
REAL |
Analog Output Control (Float) Operate Object 41 Variation 3 |
W/O. Activates control operation on previously selected point. (float value). |
|
AO<n>.DOperate.Long (See Note below) |
LONG |
Analog Output Control (32bit) Direct Operate Object 41 Variation 1 |
W/O. Selects and activates control operation on point. (32bit value). |
|
AO<n>.DOperate (See Note below) |
INTEGER |
Analog Output Control (16bit) Direct Operate Object 41 Variation 2 |
W/O. Selects and activates control operation on point. (16bit value). |
|
AO<n>.DOperate.Float (See Note below) |
REAL |
Analog Output Control (Float) Direct Operate Object 41 Variation 3 |
W/O. Selects and activates control operation on point. (float value). |
|
AO<n>.CancelSel |
DIGITAL |
Analog Output Control Cancel Current . SelectOnly |
W/O. Clear OPERATE status bits and cancel the SELECT operation to the RTU. |
where:
-
n = Point index number (range from 0 to 2048)
-
R/O = read only
-
W/O = write only
-
R/W = read or write
Note: DNP (Subset level 1) supports a ‘Direct Operate without acknowledgment’, but as this does not verify the success of the command, only ‘Direct Operate’ is currently implemented.