Rockwell Automation DeviceNet Communications Module - Manual (Page 63)

Using Explicit Messaging 7-3
Table 7.1 – ControlLogix Message Requests and Responses
Box Description
– Message Type
The message type must be CIP Generic.
— 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.
˜ Class
The object type is a DeviceNet class. Refer to
Appendix C, DeviceNet Objects, for available classes.
™ Instance
The object ID is an instance of a DeviceNet class. Refer
to Appendix C, DeviceNet Objects, for available
instances.
š Attribute
The attribute is a class or instance attribute. Refer to
Appendix C, DeviceNet Objects, for available attributes.
› Source Element
This box contains the name of the tag for any service
data to be sent from the scanner to the module and
drive. A tag must be specified even if it is not used.
œ Source Length
This box contains the number of bytes of service data to
be sent or received in the message.

Destination
This box contains the name of the tag that will receive
service response data from the module and drive. A tag
must be specified even if it is not used.
ž 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 module. This is set
with switches or parameters in the DeviceNet module.
Click Browse to find the path or type in the name of a
module that you previously mapped.