Date Code 20080918 Instruction Manual SEL-749M Relay
Appendix E
DeviceNet
Overview
This appendix describes DeviceNet™ communications features supported by
the SEL-749M Relay.
DeviceNet is a low-level communications network that provides direct
connectivity among industrial devices, resulting in improved communication
and device-level diagnostics that are otherwise either unavailable or
inaccessible through expensive hardwired I/O interfaces. Industrial devices for
which DeviceNet provides this direct connectivity include limit switches,
photoelectric sensors, valve manifolds, motor starters, process sensors, bar
code readers, variable frequency drives, panel displays, and operator
interfaces. See the SEL DeviceNet Communications Card User’s Guide for
information on the installation and use of the DeviceNet card.
Instructi on Manual
DeviceNet Card
The DeviceNet Communication Card is an optional accessory that enables
connection of the SEL-749M to the DeviceNet automation network. The card
occupies the communication expansion slot in the relay.
Figure E.1 SEL-749M Motor Relay Back Panel View With DeviceNet
Communication Expansion Slot
Courtesy of NationalSwitchgear.com
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