Rockwell Automation 20-COMM-ER 20-COMM-ER Dual-Port EtherNet/IP Communication Adapter User Manual - Manual (Page 122)

122 Rockwell Automation Publication 20COMM-UM015B-EN-P - July 2013
Chapter 6 Using Explicit Messaging
ControlLogix Controller – Formatting a Message to Read a Single Parameter,
RSLogix 5000 Software, All Versions
Figure 50 - 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 or 9F (Hex.) (4)
3 (Dec.)
9 (Hex.)
Output_Current (5)
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_PowerFlex_Drive 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). For example, to read parameter 4 of a peripheral in Port 5 of an SMC-50 controller, the instance would be 21504
+ 4 = 21508. See DPI Parameter Object on page 198 (Class code 0x93) to determine the instance number.
(3) Click Browse to find the path, or type in the name of the device listed in the I/O Configuration folder.
(4) See Table 17 on page 106 for limitations of PowerFlex 7-Class drives when using DPI Parameter Object Class code 0x93 for explicit messaging.
(5) In this example, Output Current is a 32-bit 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 parameter, the tag Data Type field must be set to ‘INT’. When using a PowerFlex 700S drive, Output Current is a floating point number requiring the Data Type field to
be set to ‘REAL’ when the creating 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).