GE GEH6505A manual Introduction Overview

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, high- speed 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 pass-

through 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	Protection for medium-voltage
Motor Management	industrial motors and associated
Relay	mechanical systems.
Multilin 565 Feeder	Complete time-overcurrent phase and
Management Relay	ground protection by monitoring feeder
	phase current and ground current.
Fanuc 90/30 PLC	Programmable logic controller (PLC)
	for applications from simple relay
	replacement to midrange process
	control.
Fanuc 90/70 PLC	Programmable logic controller with
	multiple processors and programming
	capabilities for large, high-speed
	applications.
Modbus	Maps addresses of up to 32 attached
Concentrator	POWER LEADER communications
	network (commnet) devices to
	equivalent Modbus addresses for use
	with the Ethernet Gateway.

Table 1. Examples of Modbus RTU compatible devices.

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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