Rockwell Automation Publication 750COM-UM009A-EN-P - May 2017 41
Configure the Interface Chapter 2
Setting Communication
Hierarchy
A hierarchy determines the type of device with which the interface exchanges
data. In a Controller hierarchy, the interface exchanges data with the
ControlLogix® controller or another communication bridge.
When a multicast I/O connection is used or when the interface does not have a
valid gateway address, the controller must be on the same IP subnet as the
interface to establish an I/O connection. See IP addresses in the Glossary
for
information about IP subnets.
Setting a Controller Hierarchy
To set the Controller hierarchy, follow the instructions in this section to enable
datalinks to read and write data.
Enable Datalinks to Write Data
The controller output image (controller outputs-to-drive) always contains the
logic command and reference fields. It can also have 0...16 additional 32-bit
parameters (datalinks). They are configured using 0:321 - [DL From Net 01]
… 336 - [DL From Net 16]. The output connection size in the controller
determines the number of datalinks that are actively used. See the respective
controller example sections in Chapter 3
for more information on setting the
connection size.
When using a ControlLogix controller, configure the datalink parameters now
as described in this section.
0:321 - [DL From Net 01] …336 - [DL From Net 16] control which
parameters receive the values from the network. These parameters apply to the
drive, option module, or any other connected peripheral. You can use the
PowerFlex 20-HIM-A6 or 20-HIM-C6S HIM, or another drive configuration
tool, such as Connected Components Workbench software, to select the drive
or peripheral by port number and the parameter by name. As an alternate
method, set the parameter value manually by number by using this formula:
From Net Parameter Value = (10000 * Port Number) + (Destination Parameter Number)
IMPORTANT Always use the datalink parameters in consecutive numerical order. Start
with the first parameter. For example, use 0:321… 323 to configure three
datalinks to write data. Otherwise, the network I/O connection size is larger
than necessary, which needlessly increases controller response time and
memory usage.
TIP When using the ControlLogix controller and RSLogix 5000 software, version
20 and Studio 5000® environment, version 21 or later, there is no need to
configure datalink parameters. They are assigned when configuring the
RSLogix 5000 drive Add-on Profile (see Configure Input and Output Data on
page 59).
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