Selecting cos, cyclic, or polled data exchange – Rockwell Automation 20-750-DNET PowerFlex DeviceNet Option Module User Manual
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Rockwell Automation Publication 750COM-UM002B-EN-P - October 2012
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Configuring the Option Module
Chapter 3
Host Parameters 17 - [DL To Net 01] through 32 - [DL To Net 16] configure
which parameters in the drive, option module, or any other connected peripheral
send the values to the network. You can use the PowerFlex 20-HIM-A6 or 20-
HIM-C6S HIM, or another drive configuration tool such as Connected
Components Workbench, DriveExplorer, or DriveExecutive software to select
the drive or peripheral by port number and the parameter by name. As an
alternate method, the parameter value can be set manually by number using this
formula:
To Net Parameter Value = (10000 * Port Number) + (Origination Parameter Number)
For example, suppose you want to use
Host Parameter 17 - [DL To Net 01] to
read Parameter 2 of an optional I/O module plugged into drive Port 6. Using the
formula, the value for
Host Parameter 17 - [DL To Net 01] would be (10000 * 6)
+ (2) = 60002.
Follow these steps to enable Datalinks to read data.
1.
Set the value of
Device Parameter 04 - [DLs To Net Cfg] to the number
of contiguous drive-to-controller Datalinks that are to be included in the
network I/O connection.
2.
Reset the option module; see
Resetting the Option Module on page 32
.
The option module is configured to send output data to the master (controller).
You must now configure the controller to recognize and transmit I/O to the
option module. See
Selecting COS, Cyclic, or
Polled Data Exchange
The data exchange is the method that the option module uses to exchange data
on the DeviceNet network. Polled is the default and is recommended—unless
one of the other following data exchanges, which the adapter supports, is more
appropriate for your application:
If ‘Polled and COS’ or ‘Polled and Cyclic’ is used, the option module transmits
and receives the I/O from the polled messages. It transmits only a 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 option module. COS data exchange must be
ESC
ENTER
Stopped
0.00 Hz
AUTO
F
Edit DLs To Net Cfg
0
0 << 16
•
COS (Change of State)
•
Polled and COS
•
Cyclic
•
Polled and Cyclic
•
Polled