GE Power Management 750/760 Feeder Management Relay 16-
1
16 COMMUNICATIONS 16.1 OVERVIEW
16
16 COMMUNICATIONS 16.1 OVERVIEW 16.1.1 750/760 COMMUNICATIONS FEATURES
The GE Power Management 750/760 Feeder Management relays communicate with other computerized
equipment such as programmable logic controllers, personal computers, or plant master computers using
either the AEG Modicon Modbus protocol or the Harris Distributed Network Protocol (DNP), Version 3.0. Fol-
lowing are some general notes:
• The 750/760 relays always act as slave devices meaning that they never initiate communications; they
only listen and respond to requests issued by a master computer.
• For MODBUS, a subset of the Remote Terminal Unit (RTU) format of the protocol is supported which
allows extensive monitoring, programming and control functions using read and write register commands
• For DNP, the functionality is restricted to monitoring of essential relay data and control of important relay
functions. A complete description of the services available via DNP may be found in Section 16.5: DNP 3.0
DEVICE PROFILE on page 16–84.
DNP is a complex protocol. As such, it is not within the scope of this manual to provide a description of the proto-
col’s operation in anything approaching the detail required to understand how to use it to communicate with the
relay. It is strongly recommended that interested users contact the
DNP Users Group
at the following address to
obtain further information:
Gary Moore, Secretary
DNP Users Group
4526 Manilla Rd. S.E.
Calgary, AB Canada T2G 4B6
Tel: (403) 243-3335
Fax: (403) 243-1815
Members of the
DNP Users Group
are eligible to receive complete descriptions of all aspects of the protocol.
The Users Group also operates a Website (
www.dnp.org
) on which technical information and support is avail-
able. They may also be contacted via e-mail at
dnp@home.com
.
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