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3.8. AC Drive Object
Class code 0x2A. This object models the functions specific to an AC Drive. e.g. speed ramp, torque
control etc
3.8.1. AC Drive Object Class Attributes
Attribute
ID
Name
Data
Type
Access
Rules
Description
Default
Value
1 Revision UINT Get Revision of this object 1
2 Max instance UINT Get
Maximum instance number of an object
currently created in this class level of
the device
1
3.8.2. AC Drive Object Instance Attributes
Attribute
ID
Name
Data
Type
A
ccess
Rules
Description
Default
Value
1 Number of Attributes USINT Get Number of Attributes supported 11
2 Attribute List
USINT
(ARRAY)
Get List of Attributes supported -
3 At Reference BOOL Get
1 = Drive actual at reference (speed or
torque reference) based on mode
-
4 Net Reference BOOL Get/Set
Requests torque or speed reference to
be local or from network.
0 = Set Reference not DN Control
1 = Set Reference at DN Control
Note that the actual status of torque or
speed reference is reflected in atrribute
29, RefFromNet.
-
6 Drive Mode USINT Get
0 = Vendor specific mode
1 = Open loop speed (Frequency)
2 = Closed loop speed control
3 = Torque control
4 = Process control (e.g. PI)
5 = Position control
-
7 Speed Actual INT Get
Actual drive speed (best approximation)
Units: min
-1
-
8 Speed Reference INT Get/Set
Speed reference
Units: min
-1
-
9 Current Actual INT Get
Actual motor phase current
Units: 100mA
-
18 Accel Time UINT Get/Set
Acceleration time
Time from 0 to High Speed Limit
Units: ms
-
19 Decel Time UINT Get/Set
Deceleration time
Time from High Speed Limit to 0
Units: ms
-
21 High Speed Limit UINT Get/Set
Maximum speed limit
Units: min
-1
-
29 Ref From Net BOOL Get
Status of torque/speed reference
0 = Local torque/speed reference
1 = Devicenet torque/speed reference
-
3.8.3. AC Drive Object Common Services
Supported
Service
Code
Service Name
Class
Instance
Description of Service
0x0E Get_Attribute_Single Yes Yes Returns the contents of the specified attribute.
0x10 Set_Attribute_Single
N/A
Yes
Modifies the value of the specified attribute.
3.8.4. AC Drive Object Specific Services
The AC/DC Drive Object provides no object specific services.