Sel 751A - Devicenet Communications; Devicenet Card; Appendix G: Devicenet Communications; Figure G.1 Devicenet Card Component Overview

Date Code 20100129 Instruction Manual SEL-751A Relay
Appendix G
DeviceNet Communications
Overview
This appendix describes DeviceNet communications features supported by the
SEL-751A Feeder Protection 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.
The SEL DeviceNet Communications Card User’s Guide contains more
information on the installation and use of the DeviceNet card.
DeviceNet Card
The DeviceNet Card is an optional accessory that enables connection of the
SEL-751A to the DeviceNet automation network. The card (see Figure G.1)
occupies the communications expansion Slot C in the relay.
Figure G.1 DeviceNet Card Component Overview
Node Address Switch: Rotary switch
for setting the least significant digit
(LSD) of node address
DeviceNet Connector: Accepts a
5-pin linear, open DeviceNet plug
Node Address Switch: Rotary
switch for setting the most
significant digit (MSD) of node
Data Rate Switch: Rotary switch for
selecting the DeviceNet data rate at which
the card communicates
Network Status LED: Status indicator
for DeviceNet communication
Bus Status LED: Status indicator for
backplane (relay) communication