Rockwell Automation RECOMM-ENET EtherNet/IP Communications Module - Manual (Page 74)

7-2 EtherNet/IP Communications Module
7.2 Formatting Explicit Messages
Explicit Messages for the ControlLogix Controller
ControlLogix scanners and bridges accommodate both
downloading Explicit Message Requests and uploading Explicit
Message Responses. The scanner or bridge module can
accommodate one request or response for each transaction block.
Each transaction block must be formatted as shown in figure 7.1 .
Box Description
➊ Message Type
The message type is usually CIP Generic.
➋ Service Type
The service type indicates the service (for example, Get Attribute
Single or Set Attribute Single) that you want to perform. Available
services depend on the class and instance that you are using. Refer
to Appendix C EtherNet/IP Objects.
➌
Service Code
The service code is the code for the requested EtherNet/IP service.
This value changes based on the Service Type that has been
selected. In most cases, this is a read-only box.
If you select “Custom” in the Service Type box, then you need to
specify a service code in this box (for example, 4B for a Get Attributes
Scattered service or 4C for a Set Attributes Scattered service).
Figure 7.1 – ControlLogix Message Format in RSLogix 5000
➋
➌
➍
➎ ➏
➐
➑
➒
➓
➊