Rockwell Automation 20-COMM-D DeviceNet Adapter Series B FRN 2.xxx User Manual
Page 135
Using Explicit Messaging
6-7
20-COMM-D DeviceNet Adapter User Manual
Publication 20COMM-UM002G-EN-P
ControlLogix Controller – Formatting a Message to Read a Single Parameter Using
RSLogix 5000 Software, Any Version
Figure 6.5 Get Attribute Single Message Configuration Screens
The following table identifies the data that is required in each box to
configure a message to read a single parameter.
Configuration Tab
Example Value
Description
Message Type
Service Type
(1)
Service Code
(1)
Class
Instance
(2)
Attribute
Destination
CIP Generic
Get Attribute Single
e (Hex.)
93 (Hex.)
3 (Dec.)
9 (Hex.)
Output_Current
(4)
Used to access the Parameter Object in the adapter.
This service is used to read a parameter value.
Code for the requested service.
Class ID for the DPI Parameter Object.
Instance number is the same as parameter number.
Attribute number for the Parameter Value attribute.
The tag where the data that is read is stored.
Communication Tab
Example Value
Description
Path
(3)
My_DeviceNet_Bridge
The path is the route that the message will follow.
Tag Tab
Example Value
Description
Name
Single_Read_Message
The name for the message.
(1)
The default setting for Service Type is ‘Custom’, enabling entry of a Service Code not available from the Service Type
pull-down menu. When choosing a Service Type other than ‘Custom’ from the pull-down menu, an appropriate Hex. value is
automatically assigned to the Service Code box which is dimmed (unavailable).
(2)
The instance is the parameter number in the drive (Port 0). To read a parameter in another port, see
(Class code 0x93) to determine the instance number. For example, to read parameter 4 of a peripheral in Port 5 of
a PowerFlex 750-Series drive, the instance number would be 21504 + 4 = 21508.
(3)
Click
Browse to find the path, or type in the name of the device listed in the I/O Configuration folder.
(4)
In this example, Output Current is a 32-bit integer parameter requiring the Data Type field to be set to ‘DINT’ when creating the
controller tag. If the parameter being read is a 16-bit integer, the tag Data Type field must be set to ‘INT’. When using a
PowerFlex 700S or PowerFlex 750-Series drive, Output Current is a floating point number requiring the Data Type field to be
set to ‘REAL’ when creating the controller tag. See the drive documentation to determine the size of the parameter and its data
type (16-bit or 32-bit integer or REAL).