Technical information

198 Appendix D: Networking Guide AccuLazr™ AL5010 Product Line Manual
On-Demand Messaging (ControlLogix)
On-Demand messaging provides another option for transferring bar code
data to your ControlLogix processor. With on-demand messaging, the data
transfer occurs as soon as the bar code data is available, not as the result of
constant messaging at a schedule interval.
Typically, On-Demand messaging is used in conjunction with I/O messaging.
For applications requiring only the transfer of bar code data, using On-
Demand Messaging allows the I/O packet interval to be increased (just to
provide a heartbeat with the AL5010) reducing overall network utilization.
On-Demand messaging can be enabled on the AL5010 from the EtherNet/IP
tab on the network page within the user interface. When enabled, you need
to specify the IP address and slot for the ControlLogix processor, along with
the name of the Tag to contain the bar code data.
Once this is complete, you need to define a new Tag on the ControlLogix
using its RSLogix 5000 interface. The new tag should have a type of INT and
a dimension of 67 words. The name must match the name specified on the
AL5010.
These tags will be updated every time a bar code is read. The following
table defines the format of the data within this tag.
Accu-Sort Systems, Inc. A4-AL5010_Networking_Guide_R20.doc