Chapter 1 – Introduction. ABB POWER LEADER PMCS Network Architecture

Power Management Control System

Chapter 1 – Introduction


1–1 Typical Systems

The PMCS software is capable of operating on either of two platforms:

1. PMCS running on a Modbus-based host PC, or

2. PMCS running on an Ethernet-based host PC.

Determine where the PMCS will be based using the following flowchart:

Should I base my host PC on Modbus or Ethernet?

Figure 2 shows a Modbus and Ethernet network.

Figure 3 shows a Modbus/commnet network.

Figure 4 shows an Ethernet/Modbus/commnet network, demonstrating the integration of all three protocols.

Figure 5 shows an example of an Ethernet-based host servicing native Ethernet devices, Modbus devices via the

Ethernet Gateway, and Commnet devices via the Modbus

Concentrator device.

NOTE:

Some types of IEDs must be wired on dedicated private serial network segments, one

IED per serial Modbus line. Figure 2a illustrates this configuration. The IEDs that require dedicated Modbus segments are the EPM 9650Q,

EPM 3720, ML PQM, and EPM 7330.

Is there an existing

Ethernet or plans for a future Ethernet?

No

Base PMCS on Modbus.

Yes

Base PMCS on Ethernet.

After you determine the appropriate base (Ethernet or

Modbus) for the PMCS software, the general network architecture will fall into one of the forms illustrated in

Figures 1 through 4. These figures offer samples of various network architecture configurations possible with PMCS.

Protocols Utilized

Ethernet

Direct

Modbus via

Ethernet

Modbus

Direct

Commnet

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5 ü

ü

ü

ü

ü

ü

ü

ü

ü

ü

ü

ü

As the above table shows, Modbus RTU is required in all instances, whether it is being used as a stand-alone network, supporting commnet IEDs, or serving as a slave to an Ethernet-based host.

Figure 1 presents the Power Management Control System operating on a Modbus-only network.

Figure 1. Modbus-only network.

H o st o th er

PC

...

Ethernet

...

Ethernet

G ate w ay

...

M o dbus

M ultilin

565

EPM

3720

PLC

90/70

PLC

90/30

M ultilin

269+

...

Figure 2. Commercial Ethernet and Modbus network.

3



Figure 2a. Substation Ethernet and Modbus network.

Figure 5. Ethernet-based host services Ethernet, Modbus, and commnet networks.

Figure 3. Modbus and commnet network.

H o st

...

Ethernet

Ethernet

G ate w ay

...

M o dbus

C o m m n et

M o dbus

C o ncent rator other

PC

EPM

3720

M ultilin

269+

...

PLC

90/30

...

C o m m n et d evice s

Figure 4. Ethernet, Modbus, and commnet network.

1–2 Master-Slave Organization

The PMCS in either a Modbus-host or an Ethernet-host configuration is a master-slave network. The host is considered to be the master, with the attached networks of

IEDs serving as its slaves.

This relationship means that the communications are always initiated at the host; an IED will not speak without being asked to. The master requests information, the slave replies.

The PMCS DDE Server receives a request from a client application for some data, perhaps a relay waveform capture. The Server routes the request to the correct IED, the IED replies to the Server, and the Server passes the information back to the client that originally requested it.

For further details, refer to the PMCS Network and Device

Configurator DDE Server User’s Guide

, GEH-6510.

4



1–3 Required Hardware

Several pieces of hardware are required to build a network based on PMCS. They are the host computer and the network interface card, each of which is described below.

Once the host computer is operating and its interface card is installed, it is time to attach the power management

IEDs to the network. These IEDs are described in Section

1–8.

Host Computer

The heart of the PMCS is software running on a host PC.

Regardless of whether the host PC is based on an Ethernet or Modbus network, its functions include the following:

• Communication management

• Primary user interface

• Data collection, storage, and retrieval

• Event reporting with time and date stamp

• Energy calculations and trending

• Network IED status

• Alarming and reporting

The minimum requirements for the host PC are presented in GEH-6514, Read This Book First.

Ethernet Network Card

The Ethernet network card provides the interface between the host PC and the Ethernet network. With the host communicating over Ethernet, another interface is required to communicate with RS-485 networks, where most power management IEDs reside. (Some recent power management IEDs, such as the EPM 7700, have built-in

Ethernet capability. Install these devices using standard

Ethernet networking procedures.)

This interface between Ethernet and RS-485 is provided by the Ethernet Gateway. See Section 1–4 for more information on Ethernet, and Section 1–1, Figures 2 and

4, for examples of how the Ethernet Gateway is used to integrate RS-485 networks into the Ethernet network.

1–4 Compatibility & Interconnection with Existing

Ethernet Networks

PMCS and the Ethernet Gateway require TCP/IP to be installed on the host computer. The drivers for the

TCP/IP protocol are included with Windows 2000 SP2, which is required to run PMCS, so any customer running

PMCS should have these drivers available.

Consult your LAN personnel or system integrator for information on integrating PMCS with an existing

Ethernet-based network.

The communications interface is the connection between the host PC and the network of IEDs. Your host will require either an Ethernet communications card, an RS-

485 communications card, or an RS-232/RS-485 converter.

An Ethernet-based host PC requires an Ethernet network card. A Modbus-based host PC requires an RS-485 interface card or an RS-232/RS-485 converter. These are described below.

RS-485 Interface Card or RS-232/RS-485 Converter

The RS-485 interface card provides the interface between the host PC and the Modbus network and terminates the network at the host computer. This standard RS-485 interface card provides eight RS-485 ports. PMCS supports up to 256 RS-485 communication ports. See Sections 2–1,

2–4, and 2–7 for more details on using multiple RS-485 networks with PMCS.

For more modest needs, a single RS-485 network can be provided by an RS-232/RS-485 converter, a self-contained

IED that converts signals between RS-232 and RS-485. This

IED plugs into the RS-232 port on the back of the host PC and is less expensive than an RS-485 interface card.

1–5 Operation During Power Outage

PMCS will not lose any data in the event of a power outage; however, communications will be interrupted until power is restored.

Should control power to a Modbus Concentrator be lost,

PMCS will be unable to communicate with any commnet

IEDs downstream from the Concentrator until power is restored. No data will be lost, but communications will be interrupted.

The same is true of the Ethernet Gateway; as the linchpin connecting the host to the network of IEDs, if a Gateway loses control power, the host will be unable to communicate with any IEDs attached to the Gateway until power is restored.

You can avoid this situation by providing uninterruptable power supplies (UPS) to the host computer and by providing secure control power to the IEDs, either with

UPS systems or battery backups (different IEDs have different requirements). Refer to individual user guides for information on control-power requirements.

5



1–6 Time & Date Stamping

PMCS stamps each event with a time and date code for precise reference. The time and date are set by the DDE

Server and passed across the network to each IED, so that all IEDs are synchronized.

Additionally, some PMCS IEDs support IRIG time synchronization. If IRIG is used in a PMCS system, it is recommended that the host PC be IRIG time synched as well to maintain synchronization between the IEDs and the PMCS DDE Server.

1–7 Remote System Operation

PMCS also offers the ability to use modems to reach across wide areas to remote facilities or substations. For instance, you could use PMCS at a central location to collect power management data from IEDs in a factory, warehouse, or substation in another state or control the lights, air conditioning, or protective relays in your facility from across the country.

An example of this scenario is shown in Figure 5.

Host

RS-485 wiring

Modbus device

RS-232/RS-485

Converter

RS-232 wiring

Mo de m

Radio Frequency transmission,

Fiber optic connection,

Leased line or phone line connection

...

RS-485 wiring

Mo de m

RS-232 wiring

RS-232/RS-485

Converter

Modbus device

Figure 6. Example of remote operation using modems.

56kbps phone modems, radio frequency (RF) modems, and fiber optic modems (FOM) may be used with PMCS.

While it is possible to use dial-up lines to connect to distant

RS-485 networks, the vagaries of the phone system and the excessive long-distance charges preclude using this as a twenty-four-hour-a-day connection. Leased lines dedicated to this purpose provide a viable alternative to a constant long-distance telephone connection.

For further information on using modems for long-range operation of PMCS, contact your GE sales representative.

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1–8 Supported IEDs

PMCS supports a wide variety of GE and third-party power management IEDs. These IEDs are listed in

Table 1, along with their function, communications

protocol, and maximum communications speed for

Modbus-based IEDs (Commnet IEDs must communicate through the Modbus Concentrator).

239 Motor Protection Relay

269 Plus Motor Management Relay

565 Feeder Management Relay

735 Feeder Relay

GE-Zenith Generator PLC (Series 90-70)

GE-Zenith MX200 (Microprocessor Controller)

EPM 7330

EPM 3710 Meter

EPM 3720 Meter

EPM 7300 Meter

EPM 7700 Meter

EPM 5000P Meter

EPM 5200P Meter

EPM 5300P Meter

EPM 5350P Meter

EPM 9450Q Meter

EPM 9650Q Meter

GE Fanuc PLC 90/30

GE Fanuc PLC 90/70

GE Fanuc PLC Micro 90

Universal Relay

MicroVersaTrip-C and -D Trip Units

Modbus Concentrator

POWER LEADER Electronic Power Meter

POWER LEADER Junction Box

POWER LEADER Repeater

Power Quality Meter (PQM)

Function

Protection/Control

Protection/Control

Protection/Control

Protection/Control

Metering/Control

Protection/Control

Metering

Metering

Metering

Metering

Metering/Control

Metering

Metering

Metering

Metering

Metering/Control

Metering/Control

Protection/Control

Protection/Control

Protection/Control

Protection/Control

Metering/Protection

Communications

Metering

Communications

Communication

Metering

Communications Protocol (Modbus Speed)

Modbus RTU (19.2 Kbaud)

Modbus RTU (2400 baud)










Note: Native Ethernet device.




Modbus TCP (Ethernet 10BaseT, RJ-45)








Modbus RTU (19.2 Kbaud) commnet (requires Modbus Concentrator)


Modbus (19.2 Kbaud) or commnet

(commnet requires Modbus Concentrator) commnet (requires Modbus Concentrator) commnet (requires Modbus Concentrator)

Modbus RTU (19.2 Kbaud on 1 or 2 ports)

7



RS-485 Repeater

369 Motor Management Relay

EPM 7500 Electronic Power Meter

EPM 7600 Electronic Power Meter

Motor Manager II (MMII)

EPM7430D/EPM7450D (Futura)

Spectra Electronic Control Module

Spectra MVT for GEK Frame MCCB

SR469 Motor Management Relay

SR489 Generator Management Relay

SR745 Transformer Management Relay

SR750 Feeder Management Relay

SR760 Feeder Management Relay

POWER LEADER MDP Overcurrent Relay

POWER LEADER Modbus Monitor

POWER LEADER Meter

Function

Communications

Metering/Control

Protection/Control

Protection/Control

Protection/Control

Protection/Control

Protection

Metering/Protection

Protection/Control

Protection/Control

Protection/Control

Protection/Control

Protection/Control

Protection

Monitoring

Metering

Communications Protocol (Modbus Speed)






Modbus RTU ( 9600 baud) commnet (requires Modbus Concentrator) commnet (requires Modbus Concentrator)






Modbus (19.2 Kbaud) or commnet

(commnet requires Modbus Concentrator)

Modbus RTU (19.2 Kbaud on 1 or 2 ports) commnet (requires Modbus Concentrator)

Table 1. IEDs supported by PMCS.

2

2 The POWER LEADER Ethernet Gateway is not listed in Table 1. The Ethernet Gateway is an alternate host for the RS-485 networks used when the

PMCS resides on the Ethernet level.

8

Chapter 1 – Introduction. ABB POWER LEADER PMCS Network Architecture

Chapter 1 – Introduction

1–1 Typical Systems

1–2 Master-Slave Organization

1–3 Required Hardware

1–4 Compatibility & Interconnection with Existing

Ethernet Networks

1–5 Operation During Power Outage

1–6 Time & Date Stamping

1–7 Remote System Operation

1–8 Supported IEDs

Related manuals

Table of contents

Chapter 1 &ndash; Introduction. ABB POWER LEADER PMCS Network Architecture