Rockwell Automation DeviceNet System Quick Reference - Manual (Page 9)

DeviceNet System Quick Reference
DNET-QR001A-EN-E – March 2009 9
Create the 1756-DNB and 1769-SDN Scanlist by Using AutoScan
The DeviceNet network AutoScan feature allows 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.
When you enable AutoScan, the 1756-DNB or 1769-SDN scanner module searches for devices on the
network that are not yet mapped. Once a qualifying device is found, the scanner adds the device to its
scanlist and maps its I/O data into a predefined location in the scanner’s I/O memory table. This
location is based on the device’s node address and the mapping size.
AutoScan is not enabled initially. You must enable AutoScan so that devices are automatically added to
the scanlist whenever the scanner module is in Idle mode. The mapping size provides the scanner
module with the number of bytes per node to allocate in the I/O tables. Set the mapping size so that it is
higher than the maximum input or output size of every device on the network. If a device found on the
network has an input or output size larger than the mapping size you set, it will not be added to the
scanlist.
In this example, the mapping size is set to 32 bytes per node. The 193-DNCT terminal configures and
originates AutoScan from a special menu, created specifically for that purpose.
1. Turn the key on the front of the 1756-L63 controller (in slot 2) completely clockwise.
This puts the ControlLogix controller into Program mode, which also puts the scanner module into
Idle mode.
2. In the Network Who dialog box, press the Up Arrow to navigate to and select the first line
(0 – 1756-DNB DeviceNet Scanner).
3. Press Enter to go to its configuration dialog box.
4. Press the Down Arrow to navigate to and select Scanner and press Enter .
5. Press the Down Arrow to navigate to and select AutoScan and press Enter .
This AutoScan Setup dialog box appears.
AutoScan Setup
AutoScan: Disable
Mapping: 32
Idle Mode
Active Nodes: 0