GE GEH6505A User Manual
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GEH–6505A
POWER LEADER™
Ethernet Gateway
User’s Guide
GEH–6505
WARNINGS, CAUTIONS, AND NOTES
AS USED IN THIS PUBLICATION
WARNINGS
CAUTIONS
NOTES
Warning notices are used in this publication to emphasize that hazardous voltages, currents, or other conditions that could cause personal injury exist in this equipment or
may be associated with its use.
Warning notices are also used for situations in which inattention or lack of equipment
knowledge could cause either personal injury or damage to equipment.
Caution notices are used for situations in which equipment might be damaged if care
is not taken.
Notes call attention to information that is especially significant to understanding and
operating the equipment.
This document is based on information available at the time of its publication. While
efforts have been made to ensure accuracy, the information contained herein does not
cover all details or variations in hardware and software, nor does it provide for every
possible contingency in connection with installation, operation, and maintenance.
Features may be described herein that are not present in all hardware and software
systems. GE Electrical Distribution & Control assumes no obligation of notice to
holders of this document with respect to changes subsequently made.
GE Electrical Distribution & Control makes no representation or warranty, expressed,
implied, or statutory, with respect to, and assumes no responsibility for the accuracy,
completeness, sufficiency, or usefulness of the information contained herein. No
warrantees of merchantability or fitness for purpose shall apply.
REFERENCES
POWER LEADER™ is a registered trademark of GE Company.
Modbus RTU is a registered trademark of AEG Schneider Automation.
For details of the Modbus RTU protocol, refer to PI-MBUS-300 Rev. E from
Modicon/AEG Schneider Automation.
For details of RS485 communications, refer to the EIA-485 standard.
©Copyright 1996 GE Company
All Rights Reserved
POWER LEADER™ Ethernet Gateway
Table of Contents
Chapter 1 – Introduction ...........................................................................................1
1–1 Overview .................................................................................................................................. 1
1–2 Physical Description ............................................................................................................... 2
1-3 Operational Description.......................................................................................................... 3
Message Format................................................................................................................. 3
Gateway/Host Interface.................................................................................................... 3
1–4 Specifications .......................................................................................................................... 4
1–5 Environmental Requirements................................................................................................ 4
1–6 Terminology............................................................................................................................ 4
Chapter 2 – Installation .............................................................................................5
2–1 Mounting................................................................................................................................. 5
2–2 Control Power Connections................................................................................................... 5
2–3 Ethernet Connection.............................................................................................................. 5
2–4 Modbus Connection............................................................................................................... 6
2–5 Diagnostic Connection........................................................................................................... 6
2–6 Wiring Rules for Modbus Networks....................................................................................... 6
2–7 Modbus Equivalent Addresses............................................................................................... 7
Chapter 3 – Configuration.........................................................................................8
3–1 Configuration Procedure....................................................................................................... 8
3–2 Ethernet Gateway IP Address................................................................................................. 9
3–3 Baud Rate Specification......................................................................................................... 9
3–4 Message Monitoring ............................................................................................................. 10
3–5 Ethernet Driver ..................................................................................................................... 10
3–6 Gateway Diagnostics ............................................................................................................. 11
Display Socket, IP Address and Subnet Mask................................................................ 11
RS485 Loop-back Test..................................................................................................... 11
Ethernet Test ................................................................................................................... 11
Exit Diagnostics Program............................................................................................... 11
Network Test – FACTORY USE ONLY .......................................................................... 12
3–7 Advanced Options – Technical Support Personnel ONLY ............................................... 12
Updating the Gateway Software ..................................................................................... 12
Chapter 4 – Operation .............................................................................................13
Chapter 5 – Diagnostic Messages and Errors .......................................................14
5–1 Monitor Mode....................................................................................................................... 14
5–2 Processing Error Messages ................................................................................................... 14
Chapter 6 – Troubleshooting Guide .......................................................................15
RS485 Port Configuration Worksheets..................................................................16
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POWER LEADER™ Ethernet Gateway
Table of Contents
List of Figures
Figure 1. POWER LEADER Ethernet Gateway. ............................................................................................ 1
Figure 2. Typical use of Ethernet Gateway. ...................................................................................................2
Figure 3. Front view of Ethernet Gateway, showing dimensions. ................................................................ 2
Figure 4. Rear view of the Ethernet Gateway, showing Ethernet, RS485 and RS232 ports........................ 2
Figure 5. Ethernet headers on Modbus messages......................................................................................... 3
Figure 6. Mounting hole patter for Ethernet Gateway. ................................................................................ 5
Figure 7. Connecting control power to the Ethernet Gateway..................................................................... 5
Figure 8. Making the Ethernet connection to the Gateway. ........................................................................ 5
Figure 9. Connecting an RS485 network to the Ethernet Gateway.............................................................. 6
Figure 10. Termination of the RS485 network at the last Modbus device.................................................. 6
Figure 11. Connecting a dumb terminal to the RS232 port......................................................................... 6
Figure 12. Terminal communications settings. ............................................................................................8
Figure 13. Ethernet Gateway configuration menu........................................................................................ 8
Figure 14. Gateway diagnostics menu.......................................................................................................... 11
List of Tables
1. Examples of Modbus RTU compatible devices. .......................................................................................1
2. POWER LEADER Ethernet Gateway specifications. ................................................................................ 4
3. POWER LEADER Ethernet Gateway environmental requirements........................................................ 4
4. POWER LEADER commnet devices supported by the Modbus Concentrator...................................... 7
5. RS485 Port Settings.................................................................................................................................... 10
6. Diagnostic messages key............................................................................................................................ 14
7. Error message key...................................................................................................................................... 14
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POWER LEADER™ Ethernet Gateway
Chapter 1 – Introduction
Chapter 1 – Introduction
1–1 Overview
The GE POWER LEADER™ Ethernet Gateway
(catalog number PLENETG01), shown in Figure 1,
is a microprocessor-based device that connects one
to four RS485-based Modbus Remote Terminal Unit
(RTU) networks to an industry-standard, highspeed Ethernet network. Up to 31 Modbus RTU
devices can be connected to each of the Modbus
RTU networks.
Figure 1. POWER LEADER Ethernet Gateway.
The Ethernet Gateway works with GE’s Power
Management Control System (PMCS), a
comprehensive power management software
platform that acts as the ‘host’ to RS485 networks
attached to the Ethernet Gateway. A special part of
the PMCS called the Dynamic Data Exchange
(DDE) server is a database that records the
addresses and configurations of all attached
devices. The Ethernet Gateway serves as a passthrough device, interpreting the addressing
information and routing queries from the host to
the Modbus RTU networks and passing answers to
those queries from the attached devices back to the
host.
The Ethernet Gateway strictly conforms to the
Modbus RTU protocol, providing the capability to
tie the supported Modbus RTU devices into an
Ethernet network. Table 1 contains a partial list of
devices that are compatible with the Ethernet
Gateway and conform to the Modbus RTU
standard.
Device Description
EPM 3710 Full-function, three-phase electronic
meter with optional pulse initiation,
waveform capture, data logging, and
protective relay outputs.
EPM 3720 Full-function, three-phase electronic
meter with optional pulse initiation,
waveform capture, data logging,
protective relay outputs, and harmonic
distortion measurements.
Multilin 269 Plus
Motor Management
Relay
Multilin 565 Feeder
Management Relay
Fanuc 90/30 PLC Programmable logic controller (PLC)
Fanuc 90/70 PLC Programmable logic controller with
Modbus
Concentrator
Table 1. Examples of Modbus RTU compatible devices.
Protection for medium-voltage
industrial motors and associated
mechanical systems.
Complete time-overcurrent phase and
ground protection by monitoring feeder
phase current and ground current.
for applications from simple relay
replacement to midrange process
control.
multiple processors and programming
capabilities for large, high-speed
applications.
Maps addresses of up to 32 attached
POWER LEADER communications
network (commnet) devices to
equivalent Modbus addresses for use
with the Ethernet Gateway.
NOTE: PMCS is certified for use with power
management components manufactured 5/13/96
or later. If your system interfaces to: 1) any trip
units, meters, or relays manufactured prior to
5/13/96, or 2) any Spectra RMS™ Circuit Breakers
with MicroVersaTrip PM™ Trip Units, please
contact the POWER LEADER Customer Support
Center at 1-800-843-3742.
As mentioned in Table 1, the Modbus Concentrator
allows integration of POWER LEADER commnet
devices with Modbus RTU-compatible networks for
use with the Ethernet Gateway. See Section 3–5 for
more details on the integration of commnet devices
into Modbus networks.
Figure 2 illustrates a typical Modbus RTU network
connected to a high-speed Ethernet through an
Ethernet Gateway.
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POWER LEADER™ Ethernet Gateway
Chapter 1 – Introduction
Ethernet
E PM
37 2 0
Host
PMCS
E PM
37 10
Ethernet
Gateway
PL EPM
RS485 Modbus RT URS485 Modbus RTU
PO WE R
LEADE R
Met er
Other
Mod bus
Concentr ator
Figure 2. Typical use of Ethernet Gateway.
1–2 Physical Description
Figure 3 is an outline drawing showing the
dimensions of the Ethernet Gateway. Figure 4 is a
rear view of the Gateway showing its control power,
Ethernet, RS485 and RS232 connections.
The following ports and connections are provided
on the Gateway:
• A pair of Ethernet ports provides input and output
connections to the either a 10BaseT or a 10Base2
Ethernet network.
• Four RS485 ports support up to four Modbus RTU
networks, labeled Network 1 to Network 4, with as
P C
Spectra
E CM
MVT - PM
Tri p Unit
PL C
90 /30
Mult i l in
26 9+
commnet devi ces
Mult il in
56 5
Other
P C
PLC
90 /70
many as 31 Modbus devices each and up to 247
Modbus addresses each. RS485 ports are DB-9 (9-pin
D shell) connectors with the following pin
assignments:
Data - Pin 1
Data + Pin 2
Ground Pin 5
• One RS232 port (also DB-9 style) allows connection
of a dumb terminal for configuration and
troubleshooting of the Ethernet Gateway.
• A standard PC-style power connector for AC control
power input.
6.7 in.
170.0 mm
0.32 in.
8.0 mm
7.5 in.
166.0 mm
Power
HDD Reset
7.32 in.
196.0 mm
Figure 3. Front view with dimensions.
Status
LEDs
Power
on/off
switch
Length:
15.5 in.
393.0 mm
2
Control power
connection
1
3
4
2
Four
RS485
ports
10Base2 and
10BaseT
Ethernet ports
Figure 4. Rear view showing ports.
Com 1
RS232 port for
dumb terminal
Com 2
RS232 port
not used
keyboard port
not used
POWER LEADER™ Ethernet Gateway
Chapter 1 – Introduction
1-3 Operational Description
The Ethernet Gateway transparently passes message
between the host and devices attached to the
Gateway. Figure 5 illustrates the stripping or adding
of Ethernet headers to the Modbus messages. This
section describes the nature of these messages and
how the Gateway routes them. The following
information is not necessary for configuration and use of
the Ethernet Gateway, but is provided for users who may be
developing custom applications and need such
information.
Message Format
Messages sent from the software to RS485 devices
via the Ethernet Gateway have a 15-byte header
inserted in front of the message. The header tells
the Gateway where to send the message, how long
the message is, and if parity errors were
encountered. This header has the following format:
SS DD EE NN CC
SS Sequence of ten AA hex bytes indicating the start
of a message
DD Destination device port number – the Gateway
RS485 port to which the message should be
routed (0 - 3)
EE Error status byte (0 = no parity errors, 1 = parity
errors encountered)
NN Number of bytes in the Modbus message
CC A one byte checksum calculated by adding the
first 14 bytes in the header
The header is stripped off the message by the
Gateway and the remainder of the message is sent
without changes to the destination device (or
interpreted by the Gateway if a configuration
message).
Messages from the RS485 devices to the host are
processed by adding the 15-byte header onto the
start of the message. For messages from devices to
the host, the byte in the DD position contains the
RS485 port from which the message came.
Cyclic redundancy check (CRC) handling is done
by the host on the Ethernet and the RS485 device
on the Modbus. The Gateway does not check the
CRC when receiving messages from the host or
from RS485 devices.
Hos t
PMC S
Modbus messages fr om host to device - Ethernet Gateway str ips off header
Ethernet
header
information
Message tr aveli ng on Ether net
Ethernet
header
information
Mod bus
mess a ge
Mod bus
mess a ge
Modbus messages f rom device to host - Ether net Gateway adds header
Ethernet
Gateway
Ethernet
Gateway
Figure 5. Ethernet headers on Modbus messages.
Gateway/Host Interface
The Gateway uses TCP/IP (Transmission Control
Protocol/Internet Protocol) to interface with the
host on the Ethernet.
The Gateway initially opens a socket and waits for a
host device to attempt to connect with the socket.
Once a connection is established, data messages
may be transmitted to the Gateway (and ultimately
the RS485 devices) and messages from RS485
devices passed to the host.
Mod bus
message
Message t ravel ing on RS485
Mod bus
message
RS485
device
RS485
device
3
POWER LEADER™ Ethernet Gateway
Chapter 1 – Introduction
1–4 Specifications
The specifications of the Ethernet Gateway are
listed in Table 2.
Parameter Value
Control power 90–132 Vac or 180–264 Vac,
47–63 Hz; autoranging
Power supply =150 VA min
(contact your GE sales
representative for additional
voltage options.)
Modbus communications Four RS485 ports, 1200 baud,
2400 baud, 4800 baud, 9600
baud and 19.2 Kbaud.
Ethernet communications One PCL-843 16-bit Ethernet
card; supports 10BaseT or
10Base2 transport mediums.
Standards
UL Listed
CSA Certified
Table 2. POWER LEADER Ethernet Gateway specifications.
508 & 840
C22.2 No. 14
1–5 Environmental Requirements
The environmental requirements of the Ethernet
Gateway are listed in Table 3.
Parameter Value
Operating temperature 0° C to +50° C
Storage temperature –20° C to +80° C
Relative humidity 10% to 95% noncondensing
Vibration response and
endurance
Fast transient surge ANSI C37.90.1
Radiated EMI withstand ANSI C37.90.2
Electrostatic discharge IEC 801–2
Table 3. POWER LEADER Ethernet Gateway environmental
IEC 255–21–1
Severity Class 1
Severity Class 4
requirements.
1–6 Terminology
Following are definitions of some of the terms used
in this document.
POWER LEADER – The GE family of comprehensive
power management devices and system software used
to minimize downtime and overall power cost.
PMCS – Power Management Control System software.
SCADA (supervisory control and data acquisition) – A group
of systems including power management and control
systems.
DCS (distributed control system) – A group of systems
including building automation and status
monitoring systems.
Ethernet – An open, industry-standard, high-perform-
ance network communications protocol that operates
on 10BaseT or 10Base2 transport mediums and
yields communications rates up to 10 megabits per
second.
Modbus RTU (Remote Terminal Unit) – An open, industry-
standard, high-performance network communications protocol developed by Modicon/AEG
Schneider Automation.
Modbus-compatible device – Any device equipped with a
Modbus RTU communications port.
Modbus master – A host computer running PMCS
software.
RS485/EIA485 – A physical standard for multi-drop,
high-speed, noise-tolerant communications over a
twisted pair network; often used with the Modbus
RTU protocol.
Commnet – A GE proprietary communications network
standard.
Commnet-compatible device – Any meter, relay, trip unit, or
other device equipped with a commnet communications port.
Commnet segment – A group of one to four commnet-
compatible devices (including at most one waveformcapturing meter) with all communication ports wired
to a single Concentrator commnet port.
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