Rockwell Automation 1747-SDN SLC 500 DeviceNet Scanner Module User Manual - Manual (Page 103)

103 Publication 1747-UM655B-EN-P - June 2007
Chapter
9
AutoScan
Overview The DeviceNet network AutoScan feature enables a scanner to
automatically map a network of slave devices into its scanlist without
the use of RSNetWorx for DeviceNet software. This greatly improves
the ease of setting up a DeviceNet network, especially networks
comprised of simple devices.
Basically, when the feature is enabled the 1747-SDN module searches
for devices on the network that are not yet mapped. Once a qualifying
slave device is found, it is added to the scanner's scanlist and its I/O
data is mapped into a predefined location in the scanner's I/O
memory table based on the device's node address.
Implementing AutoScan This feature requires a series C, 1747-SDN module.
The steps in this section describe how to set up the feature and how it
operates. Notice that explicit messaging is used for some of the steps
below. There are several ways that an explicit message can be sent on
the DeviceNet network.
•
A user ladder program using the DEM instruction
•
External programming/configuration device (catalog number
193-DNCT)
•
RSNetWorx for DeviceNet software
Since the purpose of the feature is to eliminate the use of RSNetWorx
software, instructions on how to send an explicit message via the class
instance editor in RSNetWorx for DeviceNet software is not covered in
this section.
For more information on using Explicit Messaging see Chapter 8.
First you need to set up the physical network.
Make sure all devices are addressed appropriately (no address
conflicts) and are communicating at the same communication rate.