Selecting cos, cyclic, or polled i/o – Rockwell Automation 25-COMM-D PowerFlex 525 DeviceNet Adapter User Manual
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Rockwell Automation Publication 520COM-UM002A-EN-E - April 2013
Chapter 3
Configuring the Adapter
peripheral send values to the network. To configure these parameters, set them to
the parameter number you wish to read over the network.
The following steps are required to enable Datalinks to read data:
1.
Set the values of only the required number of contiguous drive-to-
controller Datalinks needed to read data from the drive and that are to be
included in the network I/O connection.
2.
Reset the adapter by power cycling the drive.
After the above steps are complete, the adapter is ready to send output data to the
master (controller). Next, configure the controller to recognize and transmit I/O
to the adapter. See
,
.
Selecting COS, Cyclic, or
Polled I/O
The data exchange (sometimes called allocation) is the method that the adapter
uses to exchange data on the DeviceNet network. The adapter can be configured
to use one of the following data exchanges:
If “Polled and COS” or “Polled and Cyclic” is used, the adapter receives the I/O
from the polled messages. It transmit its Logic Status and Feedback in COS or
Cyclic messages. Other data is transmitted in Polled messages.
Cyclic and Polled data exchanges are configured in the scanner, so you only need
to set the I/O configuration in the adapter. COS data exchange must be
configured in both the adapter and the scanner. You need to set the I/O
configuration and COS parameters in the adapter.
Using COS (Change of State) Data Exchange (Optional)
Set
Device parameter 11 [COS Status Mask] for the bits in the Logic Status
word that should be checked for changes. For the Logic Status bit definitions, see
or the drive documentation.
1.
Edit any of the bits as required.
2.
Set
Device parameter 12 [COS Fdbk Change] for the amount of change
to the Feedback that is required to trigger a Change of State message.
The adapter is now configured for COS data exchange. You must configure the
scanner to allocate it using COS. See
.
•
COS (Change of State)
•
Polled and COS
•
Cyclic
•
Polled and Cyclic
•
Polled
Value
Description
0
Ignore this logic bit (Default)
1
Use the logic bit.