Rockwell Automation 20-COMM-Q ControlNet Adapter User Manual
Page 139
Using Explicit Messaging
6-11
20-COMM-C/Q ControlNet Adapter User Manual
Publication 20COMM-UM003F-EN-P
ControlLogix Controller – Formatting a Message to Write a Single Parameter Using
RSLogix 5000 Software, Any Version
Figure 6.9
Set Attribute Single Message Configuration Screens
The following table identifies the data that is required in each box to
configure a message to write a single parameter.
Configuration Tab
Example Value
Description
Message Type
Service Type
(1)
Service Code
(1)
Class
Instance
(2)
Attribute
(3)
Source Element
Source Length
CIP Generic
Set Attribute Single
10 (Hex.)
93 or 9F (Hex.)
(5)
140 (Dec.)
9 or A (Hex.)
Accel_Time_1
(6)
2
(6)
Used to access the Parameter Object in the adapter.
This service is used to write 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.
Name of the tag for any service data to be sent from the scanner or bridge to the adapter/drive.
Number of bytes of service data to be sent in the message.
Communication Tab
Example Value
Description
Path
(4)
My_PowerFlex_Drive
The path is the route that the message will follow.
Tag Tab
Example Value
Description
Name
Single_Write_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 write to a parameter in another port, see
DPI Parameter Object on page C-16
(Class code 0x93) or
Host DPI Parameter Object on page C-30
(Class code 0x9F) to determine the instance number. For example, to write to parameter 4 of a peripheral in Port 5 of a
PowerFlex 750-Series drive, the instance would be 21504 + 4 = 21508.
(3)
Setting the Attribute value to ‘9’ will write the parameter value to the drive’s Nonvolatile Storage (EEPROM) memory, which retains the parameter value even after the
drive is power cycled. Important: When set to ‘9’, the EEPROM may quickly exceed its life cycle and cause the drive to malfunction. Setting the Attribute value to ‘A’
(10 decimal) will write the parameter value to temporary memory, which deletes the parameter value after the drive is power cycled. When frequent write messages
are required, we recommend using the ‘A’ (10 decimal) setting.
(4)
Click Browse to find the path, or type in the name of the device listed in the I/O Configuration folder.
(5)
See
Table 6.A on page 6-2
for limitations of PowerFlex 7-Class and PowerFlex 750-Series drives when using DPI Parameter Object Class code 0x93 or Host DPI
Parameter Object Class code 0x9F for explicit messaging.
(6)
In this example, Accel Time 1 is a 16-bit integer parameter requiring the tag Data Type field to be set to ‘INT’ when creating the controller tag. If the parameter being
written to is a 32-bit integer, the tag Data Type field must be set to ‘DINT’. Also, the Source Length field on the Message Configuration screen must correspond to the
selected Data Type in bytes (for example, 4 bytes for a DINT or a REAL). When using a PowerFlex 700S or PowerFlex 750-Series drive, Accel Time 1 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).