Rockwell Automation 20-750-ENETR PowerFlexDual-Port EtherNet/IP Option Module - Manual (Page 101)

Rockwell Automation Publication 750COM-UM008A-EN-P - July 2012 101
Using Explicit Messaging (Adapter mode only) Chapter 6
For information on the maximum number of Explicit Messages that can be
executed at a time, see the documentation for the bridge or scanner and/or
controller that is being used.
ControlLogix Controller
Examples
For supported classes, instances, and attributes, see Appendix C , EtherNet/IP
Objects (Adapter mode only).
ControlLogix Controller Example Ladder Logic Program to Read a
Single Parameter
A Get Attribute Single message is used to read a single parameter. This read
message example reads the value of the 32-bit REAL (floating point) parameter
007 - [Output Current] in a PowerFlex 750-Series drive.
Table 6 - Example Controller Tags to Read a Single Parameter
Figure 24 - Example Ladder Logic to Read a Single Parameter
➍ The controller retrieves the Explicit Message Response from the scanner’s buffer (upload).
➎ The Explicit Message is complete.
Event Description
TIP To display the Message Configuration dialog box in RSLogix 5000 software, add
a message instruction (MSG), create a new tag for the message (Properties:
Base tag type, MESSAGE data type, controller scope), and click the
button
in the message instruction.
IMPORTANT The explicit messaging examples in this section can be performed using any
version of RSLogix 5000 software.
IMPORTANT The read and write messaging examples in this section are for Device
parameters which use Class Code 0x93. For Host parameters, use Class Code
0x9F and format the rest of the message in the same way as these examples.
The Message Configuration has a Service Type of “Parameter Read” which is
Class code 0x0F, Parameter Object. Parameter Object is not supported in
PowerFlex 750-series drives.
Operand Controller Tags for Single Read Message Data Type
XIC Execute_Single_Read_Message BOOL
MSG Single_Read_Message MESSAGE