Rockwell Automation 22-COMM-D DeviceNet Adapter - Manual (Page 59)

Using Explicit Messaging 6-3
The following table identifies the number of Explicit Messages that can
be executed at a time.
ControlLogix Message Requests and Responses
Scanner Messages at
One Time Refer To
1756-DNB 5 Figure 6.1
Box Description
➊
Message Type
The message type must be CIP Generic.
➋ Service Type/Service Code
The service type/code is the requested DeviceNet service. Available services
depend on the class and instance that you are using. Refer to
Appendix C ,
DeviceNet Objects .
➌
Class
The object type is a DeviceNet class. Refer to
Appendix C , DeviceNet Objects , for
available classes.
➍
Instance
The object ID is an instance of a DeviceNet class. Refer to
Appendix C , DeviceNet
Objects , for available instances.
➎
Attribute
The attribute is a class or instance attribute. Refer to
Appendix C , DeviceNet
Objects , for available attributes.
➏
Source Element
This box contains the name of the tag for any service data to be sent from the
scanner to the adapter and drive. A tag must be specified even if it is not used.
➐
Source Length
This box contains the number of bytes of service data to be sent or received in the
message.
➑ Destination
This box contains the name of the tag that will receive service response data from
the adapter and drive. A tag must be specified even if it is not used.
➒ Path
The path includes the following:
• Name of the DeviceNet scanner.
• Communication port on the front of the 1756-DNB scanner. Always 2.
• Node address of the DeviceNet adapter. This is set with switches or
parameters in the DeviceNet adapter.
Tip: Click Browse to find the path or type in the name of a module that you
previously mapped.