Rockwell Automation 5720 DriveLogix System - Manual (Page 177)

Publication 20D-UM002C-EN-P - November 2003
Communicating with Devices on a ControlNet Link 7-31
2. In RSNetWorx software, open the ControlNet configuration for the
target ControlNet PLC-5 controller, insert a Receive Scheduled Message
and enter the following Message size:
3. In the RSNetWorx software, reschedule (save) the network.
The ControlNet PLC-5 controller does not perform type checking. Make sure
the PLC-5 data type can correctly receive the DriveLogix produced tag to
ensure proper data is being received.
When a ControlNet PLC-5 controller consumes a tag that is produced by a
Logix5000 controller, it stores the data in consecutive 16-bit integers. The
ControlNet PLC-5 controller stores floating-point data, which requires 32-bits
regardless of the type of controller, as follows:
• The first integer contains the upper (left-most) bits of the value.
• The second integer contains the lower (right-most) bits of the value.
To re-construct the floating point data within the ControlNet PLC-5
controller, first reverse the order of the integers and then copy them to a
floating-point file.
Consuming a tag from a ControlNet PLC-5 controller
To consume a tag from a ControlNet PLC-5 controller,:
1. In RSNetWorx software, open the ControlNet configuration of the
ControlNet PLC-5 controller, insert a Send Scheduled Message.
2. In RSLogix 5000 software, add the ControlNet PLC-5 controller to the
Controller Organizer.
3. Create a user-defined data type that contains these members:
If the produced tag
contains: Then, for the Message size, enter:
INTs The number of integers in the produced tag
DINTs Two times the number of DINTs or REALs in the produced
tag. For example, if the produced tag contains 10 DINTs,
enter 20 for the Message size.
REALs
Data type: Description:
DINT Status
INT[x], where “x” is the output size of the
data from the ControlNet PLC-5 controller.
(If you are consuming only one INT, no
dimension is required.) Data produced by a ControlNet PLC-5
controller