136 Rockwell Automation Publication 1769-UM021I-EN-P - May 2018
Chapter 6 Communicate over Networks
Compact I/O 1769-SDN DeviceNet Scanner
You connect a CompactLogix 5370 L2 or L3 controller to a DeviceNet
network via a Compact I/O 1769-SDN DeviceNet scanner.
Before installing the scanner, consider the following:
• You can connect the scanner to an adjacent controller, power supply, or
I/ O module.
• You must account for these two requirements jointly:
– Power Supply Distance Rating - Described on 140
– Current Capacity in CompactLogix 5370 L3 Control Systems -
Described on 140
• The scanner, as a master, can own up to 63 slave I/O nodes.
• Another DeviceNet master can own a scanner that is simultaneously a
master and be a slave.
The scanner has this functionality:
• Supports messaging to devices, not controller to controller
• Supports control-level network to device-level network for
programming, configuration, control, or data collection
• Supports back up your CompactLogix 5370 L2 or L3 controller on the
DeviceNet network
For more information on using the 1769-SDN to back up your
CompactLogix 5370 L2 or L3 controller, see the 1769-SDN DeviceNet
Scanner Module User Manual, publication 1769-UM009
.
• Shares a common application layer with EtherNet/IP networks
• Offers diagnostics for improved data collection and fault detection
Power Supply Distance Rating
CompactLogix 5370 L2 and L3 control systems enable you to install
1769-SDN scanners as local expansion modules. The 1769-SDN scanner has a
power supply distance rating that you must consider before installing it.
Power supply distance rating is the number of slots a 1769-SDN scanner can be
installed away from the power supply. The 1769-SDN scanner has a power
supply distance rating of four. Therefore, your CompactLogix 5370 L2 or L3
control system can include up to three modules between the 1769-SDN
scanner and the power supply.
The power supply distance rating of the 1769-SDN scanner as a design
consideration differs by CompactLogix L2 controller catalog number.
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