Siemens MJ-XL, MJ-X Installation Manual

Download

Page 1

MJ-XL™ Communications Module

Fiber Optic and RS-232/485 Installation Manual for MJ-XL and MJ-X Control Panels

POWER

Watchdog

Communications

POWER

Watchdog

Communications

In Out

Fiber Optic Communications Module

RS - 232 / 485

Communications Module

Fiber Optic

Communications Module

Rxd Txd

G N D

R T N - +

Data

Rxd Txd

Manual No. 21-115527-017

RS-232/485 Communications Module

Page 2

DANGER

This equipment contains hazardous voltages. Will cause death or serious Injury. To prevent: De-energize and ground the equipment before

maintenance. Only qualified personnel should work on this

equipment after becoming thoroughly familiar with all warnings, safety notices, instructions and maintenance procedures contained herein. The successful and safe operation of this equipment Is dependent upon proper handling, installation, operation and maintenance.

The information contained herein is general in nature and not intended for specific application purposes. It does not relieve the user of responsibility to use sound practices in application, installation, operation, and maintenance of the equipment purchased. Siemens reserves the right to make changes in the specifications shown herein or to make improvements at any time without notice or obligations. Should a conflict arise between the general information contained in this publication and the contents of drawings or supplementary material or both, the letter shall take precedence.

NOTE

Authorized and qualified Personnel

For the purpose of this manual a qualified person is one who is familiar with the installation, construction or operation of the equipment and the hazards involved. In addition, he has the following qualifications: (a) Is trained and authorized to de-energize, clear, ground, and tag circuits and equipment in accordance with established safety

practices.

(b) Is trained in the proper care and use of protective equipment such as rubber gloves, hard hat, safety glasses or face shields,

flash clothing, etc., in accordance with established safety practices.

These instructions do not purport to cover all details or variations in equipment, nor to provide for every possible contingency to be met in connection with installation, operation, or maintenance. Should further information be desired or should particular problems arise which are not covered sufficiently for the purchaser's purposes, the matter should be referred to the local sales office, listed on the back of this instruction guide.

The contents of this instruction manual should not become part of or modify any prior or existing agreement, commitment or relationship. The sales contract contains the entire obligation of Siemens Power Transmission & Distribution Inc. The warranty contained in the contract between the parties is the sole warranty of Siemens Power Transmission & Distribution Inc. Any statements contained herein do not create new warranties or modify the existing warranty.

DANGER Indicates an imminently hazardous situation which, if not avoided, will result in death or serious injury. WARNING Indicates a potentially hazardous situation which, if not avoided, could result in death or serious injury. CAUTION Indicates a potentially hazardous situation which, if not avoided, may result in minor or moderate injury.

SUMMARY

Page 3

Table of Contents

1 INTRODUCTION........................................................................................................................................1

1.1 DESCRIPTION........................................................................................................................................... 1

1.2 FRONT PANEL LED INDICATORS.............................................................................................................. 1

2 TRANSMISSION METHODS..................................................................................................................... 2

2.1 FIBER OPTIC TRANSMISSION.....................................................................................................................2

2.2 WIRE TRANSMISSION............................................................................................................................... 2

2.2.1 RS-232............................................................................................................................................ 2

2.2.2 RS-485............................................................................................................................................ 3

3 COMMUNICATION PROTOCOLS ..........................................................................................................4

4 INSTALLING THE COMMUNICATIONS MODULE IN MJ-XL CONTROL PANELS....................... 5

4.1 REMOVING THE MJ-X

4.2 MOUNTING THE COMMUNICATIONS MODULE............................................................................................ 6

4.3 SETTING THE COMMUNICATIONS MODULE JUMPERS.................................................................................. 6

4.3.1 Fiber Optic Version ........................................................................................................................6

4.3.2 RS-232/485 Version ........................................................................................................................ 7

4.4 REPLACING THE MJ-X

4.5 MOUNTING THE COMMUNICATIONS MODULE LABEL................................................................................. 8

5 INSTALLING THE COMMUNICATIONS MODULE IN MJ-X CONTROL PANELS ......................... 9

5.1 SETTING THE COMMUNICATIONS MODULE JUMPERS.................................................................................. 9

5.1.1 Fiber Optic Version ........................................................................................................................9

5.1.2 RS-232/485 Version ...................................................................................................................... 10

5.2 MOUNTING THE COMMUNICATIONS MODULE IN MJ-X CONTROL PANELS................................................ 10

6 VERIFYING THE COMMUNICATIONS MODULE INSTALLATION............................................... 14

6.1 PERFORMING THE INITIAL DIAGNOSTIC CHECKOUT................................................................................. 14

6.2 PERFORMING THE LOOPBACK DIAGNOSTIC TEST..................................................................................... 14

7 CABLING THE COMMUNICATIONS MODULE TO THE POWER SYSTEM .................................15

7.1 FIBER OPTIC CABLE TYPE...................................................................................................................... 15

7.1.1 Fiber Optic Cable Lengths............................................................................................................ 15

7.1.2 Fiber Optic Connector.................................................................................................................. 16

7.1.3 Fiber Optic Connections............................................................................................................... 16

7.2 RS-485 TWISTED-PAIR CABLE................................................................................................................16

7.2.1 RS-485 Cable Type ....................................................................................................................... 16

7.2.2 RS-485 Cable Grounding.............................................................................................................. 17

7.2.3 RS-485 Connector......................................................................................................................... 17

7.2.4 RS-485 Cabling Considerations .................................................................................................... 18

7.3 RS-232 CONNECTIONS .......................................................................................................................... 20

7.3.1 RS-232 Multi-drop Wiring............................................................................................................. 21

7.4 RS-232/485 CONNECTIONS.................................................................................................................... 21

7.5 COMMUNICATIONS MODULE CONFIGURATION ........................................................................................ 22

7.5.1 Communications Menu Item Descriptions ..................................................................................... 24

7.6 TROUBLESHOOTING COMMUNICATIONS PROBLEMS................................................................................. 24

7.6.1 Using LEDs to Help Diagnose Communications Problems............................................................ 25

7.6.2 Using MJXplorer to Troubleshoot Communications Problems....................................................... 25

8 SPECIFICATIONS ....................................................................................................................................27

8.1 PHYSICAL DIMENSIONS.......................................................................................................................... 27

8.2 FIBER OPTIC LINK MODULE SPECIFICATIONS...........................................................................................28

8.3 RS-232/RS-485 MODULE SPECIFICATIONS............................................................................................. 28

REAR COVER ........................................................................................................ 5

REAR COVER........................................................................................................ 8

Manual No. 21-115527-017

Page 4

Figures

FIGURE 1-1 MJ-X FIGURE 1-2 MJ-X

FIGURE 2-1 FIBER OPTIC NETWORK......................................................................................................................... 2

FIGURE 2-2 RS-232 CONNECTION ........................................................................................................................... 3

FIGURE 2-3 MODEM CONNECTION........................................................................................................................... 3

FIGURE 2-4 RS-485 CONFIGURATION – LOOP NETWORK.......................................................................................... 4

FIGURE 2-5 RS-485 CONFIGURATION – STAR NETWORK .......................................................................................... 4

FIGURE 4-1 MJ-X

FIGURE 4-2 COMMUNICATIONS MODULE INSTALLATION........................................................................................... 6

FIGURE 4-3 FIBER OPTIC VERSION JUMPER LOCATIONS ............................................................................................ 6

FIGURE 4-4 RS-232/485 VERSION JUMPER LOCATIONS............................................................................................. 7

FIGURE 4-5 MJ-XL WITH FIBER OPTIC LABEL INSTALLED ........................................................................................ 8

FIGURE 4-6 MJ-XL WITH RS-232/485 LABEL INSTALLED ........................................................................................ 8

FIGURE 5-1 FIBER OPTIC VERSION JUMPER LOCATIONS ............................................................................................ 9

FIGURE 5-2 RS-232/485 VERSION JUMPER LOCATIONS............................................................................................. 9

FIGURE 5-3 MJ-X CONTROL PANEL REAR COVER ...................................................................................................11

FIGURE 5-4 COMMUNICATIONS MODULE INSTALLATION IN MJ-X ............................................................................12

FIGURE 5-5 MEMBRANE SWITCH CABLE ROUTING...................................................................................................12

FIGURE 5-6 MJ-X COMMUNICATIONS MODULE CABLE ROUTING.............................................................................13

FIGURE 7-1 FIBER OPTIC CONNECTIONS..................................................................................................................16

FIGURE 7-2 RS-485 CONNECTION ..........................................................................................................................17

FIGURE 7-3 SCREW TERMINAL BLOCK CONNECTOR.................................................................................................17

FIGURE 7-4 RS-485 LOOP TOPOLOGY.....................................................................................................................18

FIGURE 7-5 PROPER SHIELD CONNECTIONS.............................................................................................................19

FIGURE 7-6 COMMUNICATION CABLE ROUTING.......................................................................................................19

FIGURE 7-7 RS-232 MULTI-DROP CONFIGURATION.................................................................................................21

FIGURE 7-8 RS-232 CONNECTOR PINOUT ...............................................................................................................21

FIGURE 7-9 SCREW TERMINAL CONNECTION...........................................................................................................22

FIGURE 7-10 MJXPLORER TROUBLESHOOTING CONNECTIONS.................................................................................26

FIBER OPTIC COMMUNICATIONS MODULE................................................................................... 1

RS-232/485 COMMUNICATIONS MODULE ................................................................................... 1

REAR COVER ............................................................................................................................. 5

Tables

TABLE 4-1 FIBER OPTIC VERSION JUMPER SETTINGS................................................................................................ 7

TABLE 4-2 RS-232/485 BOARD JUMPER SETTINGS................................................................................................... 7

TABLE 5-1 FIBER OPTIC VERSION JUMPER SETTINGS...............................................................................................10

TABLE 5-2 RS-232/485 BOARD JUMPER SETTINGS..................................................................................................10

TABLE 7-1 RS-485 CABLE SPECIFICATIONS ............................................................................................................17

TABLE 7-2 RS-232 INTELLIGENT ELECTRONIC DEVICE WIRING ...............................................................................20

TABLE 7-3 MODEM WIRING ...................................................................................................................................20

TABLE 7-4 COMMUNICATIONS MENU ITEMS............................................................................................................22

ACCESS, is a trademark of Siemens Energy & Automation, Inc. MJ-XL and MJXplorer are trademarks of Siemens Power Transmission & Distribution Inc. Siemens is a registered trademark of Siemens AG.

 1994 - 2000 Siemens Power Transmission & Distribution Inc.

Page 5

MJ-XL Communications Module

1 Introduction

This manual describes the installation and connection procedures for the MJ-XL™ Communications Modules. Information is provided for both Fiber Optic and RS232/485 Communications Modules. The operation and functionality of both versions are quite similar; the mechanical configurations and installation procedures are different. The manual also covers the procedures for connecting the module to a system of networked MJ-XL Tap Changer Control Panels.

1.1 Description

The Siemens MJ-XL Communications Module is the communication interface used to connect the MJ-XL Control Panel to a network of regulator controllers, control devices, and supervisory equipment. The module is available with either a fiber optic or RS-232/485 interface. Figure 1-1 illustrates the Fiber Optic Communications Module. Figure 1-2 illustrates the RS-232/485 Communications Module

The fiber optic module enables connection of the tap changer control panel to the supervisory equipment via multimode fiber optic cable. The RS-232/485 module enables connection of the tap changer control panel to the supervisory equipment via electrical wire.

The communications modules are installed in MJ-XL Tap Changer Control Panels. This allows you to easily network the control panels and other field devices to a remote terminal unit (RTU) or other supervisory device. An adapter kit is available for mounting MJ-XL Communications Modules in MJ-X Control Panels.

POWER

Watchdog

Communications

POWER

Watchdog

Communications

In Out

Fiber Optic

Communications Module

Rxd Txd

Figure 1-1 MJ-XL Fiber Optic Communications Module

RS - 232 / 485

Communications Module

G N D

Data T N - +

Rxd Txd

Figure 1-2 MJ-XL RS-232/485 Communications Module

1.2 Front Panel LED Indicators

The MJ-XL Communications Module has five LED indicators.

• Power indicates the MJ-XL Communications Module is powered on.

Page 6

• Watchdog when blinking steadily, indicates the MJ-XL Communications Module microprocessor and software

are functioning properly.

• Communications indicates communications activity with this module. (The Comm Module turns on this

indicator when it receives a valid message with a valid address.)

• Rxd indicates the communications module is receiving data.

• Txd indicates the communications module is transmitting data.

2 Transmission Methods

There are two transmission mediums available for sending data to the RTU:

• fiber optic

• wire

2.1 Fiber Optic Transmission

The primary benefits of fiber optic communications are its immunity to induced electrical interference and relatively low signal loss. Electrical noise cannot be induced into the cable to generate transient spikes that disrupt data communications.

The MJ-XL Fiber Optic Communications Module uses multi-mode fiber optic cable. The electrical signals are converted to optical signals by the communication unit. The optical signals are then transmitted via the fiber optic cable to the RTU. Communications modules in the path between the transmitting communications module and the RTU act as repeaters and simply regenerate the signals and forward them to the next device, Figure 2-1.

MJ-X MJ-X MJ-X

Out Out Out

In In In

Out

RTU Fiber Optic Cables

Figure 2-1 Fiber Optic Network

2.2 Wire Transmission

The advantage of wire transmission is simple installation. The MJ-XL supports two popular wire interfaces: RS232 and RS-485. The screw terminal block connector supplied with the module can be wired for either interface. Connection to the supervisory device is typically accomplished using either a DE-9 or DB-25 connector for RS232, while the connector used for RS-485 will vary with the application.

2.2.1 RS-232

Direct RS-232 connections are limited to a maximum distance of 50 feet, Figure 2-2. The MJ-XL RS-232/485 Communications Module supports RS-232 multi-drop configurations.

Page 7

MJ-XL Communications Module

RS-232Cable

The distance between devices may be extended with modems, Figure 2-3. Modem connections are either dial-up, short-haul, or radio-based. Dial-up modems are typically deployed when there is easy access to the telephone connections, while short-haul modems are useful within a facility where there is access to the wiring. Consider using a radio modem when laying cable for a land-line modem is impractical.

50 ft Max.

RTU MJ-X MJ-X

50 Feet

Figure 2-2 RS-232 Connection

50 ft Max.

RTU

Modem Modem

50 ft Max.

MJ-X

Figure 2-3 Modem Connection

2.2.2 RS-485

The maximum distance for RS-485 is 4000 feet, either from device to device or for an entire loop. The recommended cable for RS-485 is shielded, twisted-pair, 22 AWG. This type of cable consists of jacketed wire that is twisted together and wrapped in a shield to prevent electromagnetic interference from affecting the data signal. A maximum of 32 devices can be connected to an RS-485 network. Typical network configurations are loop, star, and open-ended. These are shown in Figures 2-4 to 2-6. The recommended network configuration is a loop. This will ensure that all devices remain connected to the master unit in the event of a line break. If the loop configuration does not allow you to place the equipment in the desired location, connect the network open ended.

If either the star or open-ended configurations are used, termination resistors must be installed at the end devices. For more information on installing RS-485 networks, refer to Section 7.2 RS-485 Twisted-pair Cable. The following characteristics determine the maximum length and data rate of an RS-485 network.

Impedance: The maximum transfer of energy occurs when the cable’s terminating impedance matches the characteristic impedance of the cable. If the cable’s characteristic impedance is 120 ohms, use a 120 ohm terminating resistor.

Capacitance: Wire capacitance affects the rise and fall times of a transmitted signal and, as a result, limits the signaling (baud) rate of the data. The higher the capacitance, the lower the maximum baud rate. Additionally, higher capacitance requires higher output current to drive the line. Since capacitance is proportional to wire length, it can limit the maximum cable length for a given baud rate.

Page 8

Cable Size: Cable size along with capacitance and DC resistance determine whether the cable is suitable for the application. A 22-gauge cable will provide a proper balance of capacitance and resistance.

DC Resistance: DC resistance determines the maximum length of wire allowed for an application. The maximum length is determined by the resistance of each twisted pair along with the device termination resistance. The use of surge protectors with series resistance also contributes to loop resistance.

Twisted-pair

MJ-X

Cabling 4000 ft max. total

RTU

MJ-X

Figure 2-4 RS-485 Configuration – Loop Network

Twisted-pair

MJ-X

Cabling 4000 ft max. total

RTU

MJ-X

Figure 2-5 RS-485 Configuration – Star Network

Twisted-pair

MJ-X

Cabling 4000 ft max. total

RTU

Figure 2-6 RS-485 Configuration – Open-Ended Network

3 Communication Protocols

The MJ-XL Control Panel is designed to be used in a network of intelligent power control devices communicating with a supervisory device or remote terminal unit (RTU). Each device on the network has a specific communications address assigned to allow messages to be directed to and from the device. Messages are transmitted from the RTU to all devices and only the device with the specified address will respond. The MJ-X Communications Module supports the following protocols. Refer to the documents listed for details about the protocols.

• Distributed Network Protocol (DNP 3.0). (See User’s Group website: www.dnp.org)

• The Cooper 2200 Protocol (with or without address byte)

• MJ-3A Format “A”, “B1”, and “B2”

MJ-XMJ-X

Page 9

MJ-XL Communications Module

• The 2179 Protocol ( Based on the PG&E Protocol)

• Other (contact the factory for the latest list of supported protocols)

4 Installing the Communications Module in MJ-XL Control Panels

The MJ-XL Communications Modules are mounted directly on the MJ-XL Main Processor Board. Follow these steps to install the communications module. Details are provided in the sections below.

1. Turn off power to the MJ-X

2. Remove the MJ-XL rear cover.

3. Install the communications module.

4. Set the communications module jumpers.

5. Remount the MJ-XL rear cover.

6. Install the communications module label.

4.1 Removing the MJ-XL Rear Cover

Turn off the power to the MJ-XL and remove the four screws holding the rear cover to the case, see Figure 4-1 below. Uncurl the cable clamp at the center of the rear cover and slide the cable out.

Uncurl cable-clamp and slide cable out

Figure 4-1 MJ-XL Rear Cover

Remove Case Screws

Page 10

4.2 Mounting the Communications Module

)

Hold the communications module in place over the five standoffs on the main PCB and insert the 24-pin connector on the ribbon cable into the 24-pin connector (P8) on the main PCB. If you are installing the RS-232/485 version, insert the 6-pin power-cable connector into P9 on the main PCB. See Figure 4-2 below. Mount the communications module on the threaded standoffs on the main PCB using the five screws provided.

6-32 x 3/8"Screw (5)

Ribbon Cable with 24-PinConnector

Comm Mod PCB

Power Cable (RS-232/485 only

24-PinConnector

MJ-XLMain PCB

Figure 4-2 Communications Module Installation

4.3 Setting the Communications Module Jumpers

Prior to installing the communication module into the MJ-X Control Panel, ensure that the jumpers are properly installed on the printed circuit board. Jumper selections for the Fiber Optic version and RS232/485 version are described in separate sections below.

4.3.1 Fiber Optic Version

The jumper locations on the fiber optic version are shown in Figure 4-3. The view of the module is from the component side. The fiber optic receiver (RX) and transmitter (TX) are shown for reference. The jumper settings are listed in Table 4-1.

Set Auto Repeat to no repeat when only one unit is installed in the network.

J14

J10

J12

1 2 3

J11

Figure 4-3 Fiber Optic Version Jumper Locations

Page 11

MJ-XL Communications Module

J11

J14

J12

J10

1 2 3

Figure 4-4 RS-232/485 Version Jumper Locations

Table 4-1 Fiber Optic Version Jumper Settings

Jumper Name Position Function Selected State Description

J14 Auto Repeat

1-2

Auto Repeat Auto repeat for mark 0 or mark 1 2-3 No Repeat Force 0 Out No Repeat Force 1 (no jumper installed at 1-2 or 2-3)

Out

Normal Set Low Power Transmitter OutputJ12 Range In Long Set High Power Transmitter Output (See Note 2)

Note 1: Default pin settings are shown in bold text. Note 2: If 50/125 µm cable is used, J12 must be jumpered (In). See section 5.1 for details.

4.3.2 RS-232/485 Version

Figure 4-4 shows the jumper locations on the RS-232/485 version, viewed from the component side. Jumpers and their default settings are listed in Table 4-2.

In an RS-485 application, connect Signal Return (RTN) between the communication devices when there is a ground potential rise between the connected devices. When the device RTN pins are connected, jumper J11 should be Out (unless required by safety codes) to prevent ground loop currents. (If it is necessary to connect the RTN to GND after the Communications Module is installed, you can make this connection at the 8-pin terminal block connector with a wire jumper.)

Table 4-2 RS-232/485 Board Jumper Settings

Jumper Name Position Function Selected State Description

1-2 Receive Enable RS-485 receiver is always enabledJ10 RS-485

RCV EN

2-3

Out

Ground Strap

In Grounded Signal Return connected to frame ground

Auto Enable RS-485 receiver is automatically enabled by MJ-X

Communication Module microprocessor control.

Not grounded Signal Return not connected to frame groundJ11 Safety

Note: Default pin settings are shown in bold text.

Page 12

4.4 Replacing the MJ-XL Rear Cover

Remove the adhesive strip covering the rectangular opening for the RS-232/485 Connector, and remove the two plastic caps covering the holes for the Fiber Optic "In" and "Out" connectors. If you are installing the RS-232/485 version, remove the plugable 8-pin terminal block connector from the communications module before replacing the rear cover. Make sure that all of the cables and wires are inside the enclosure and carefully place the rear cover over the communications module and main PCB and fasten with the four case screws. Uncurl the cable clamp and slide the cable into place.

4.5 Mounting the Communications Module Label

Carefully punch out the indicator and connector holes in the communications module label. Carefully remove the backing from the label and place it on the rear cover. Make sure that the holes in the label are lined up with the indicator and connector holes on the rear cover. When the label is in place, rub the label to secure it in position. The rear cover with labels installed is shown in Figures 4-5 and 4-6 below.

FiberOptic

Communications Module

Rxd Txd

POWER

Watchdog

In Out

Communications

Figure 4-5 MJ-XL with Fiber Optic Label Installed

POWER

Watchdog

Commun ications

RS - 232 / 485

Communications Module

Data

N - +

Rxd Txd

Figure 4-6 MJ-XL with RS-232/485 Label Installed

Page 13

MJ-XL Communications Module

5 Installing the Communications Module in MJ-X Control Panels

The MJ-XL Communications Modules are installed in the Accessory Section on the back of the MJ-X Control Panel. Before installing the communications module, set the jumpers on the communications module printed circuit board for proper operation. Install the communications module in the MJ-X, connect the cables, and test the unit. Once these tasks have been performed the system is ready for operation. The following sections describe how to set the jumpers and install the communications module.

5.1 Setting the Communications Module Jumpers

5.1.1 Fiber Optic Version

The jumper locations on the fiber optic version are shown in Figure 5-1. The view of the module is from the component side. The fiber optic receiver (RX) and transmitter (TX) are shown for reference. The jumper settings are listed in Table 5-1.

Set Auto Repeat to no repeat when only one unit is installed in the network.

J14

123

J12

1 2

J10

J11

J14

J12

J10

123

J11

Figure 5-1 Fiber Optic Version Figure 5-2 RS-232/485 Version

Jumper Locations Jumper Locations

Page 14

Table 5-1 Fiber Optic Version Jumper Settings

Jumper Name Position Function Selected State Description

J14 Auto Repeat

Note 1: Default pin settings are shown in bold text. Note 2: If 50/125 µm cable is used, J12 must be jumpered (In). See section 5.1 for details.

1-2

2-3 No Repeat Force 0 Out No Repeat Force 1 (no jumper installed at 1-2 or 2-3)

Out

In Long Set High Power Transmitter Output (See Note 2)

Auto Repeat Auto repeat for mark 0 or mark 1

Normal Set Low Power Transmitter OutputJ12 Range

5.1.2 RS-232/485 Version

Figure 5-2 shows the jumper locations on the RS-232/485 version, viewed from the component side. Jumpers and their default settings are listed in Table 5-2.

Table 5-2 RS-232/485 Board Jumper Settings

Jumper Name Position Function Selected State Description

1-2 Receive Enable RS-485 receiver is always enabledJ10 RS-485

RCV EN

2-3

Out

Ground Strap

In Grounded Signal Return connected to frame ground

Note: Default pin settings are shown in bold text.

Auto Enable RS-485 receiver is automatically enabled by MJ-X

Communication Module microprocessor control.

Not grounded Signal Return not connected to frame groundJ11 Safety

5.2 Mounting the Communications Module in MJ-X Control Panels

Follow these steps to install the communications module in the MJ-X Control Panel.

1. If the control panel is installed on a Siemens regulating device, first turn off the MJ-X power, then disconnect

the polarized disconnect switch (PDS) terminal block and remove the control panel from the housing.

2. Loosen the PDS cable strain relief on the rear cover and rotate the strain relief plate to the open position,

Figure 5-3.

Page 15

MJ-XL Communications Module

AccessoryCoverPlate

ReliefPlate

PDS Strain

Figure 5-3 MJ-X Control Panel Rear Cover

3. Remove the six screws on the side of the rear cover that hold it to the control panel.

4. Feed the PDS cable harness through the strain relief cutout while removing the rear cover.

5. Remove the accessory cover plate from the rear cover. Discard the accessory cover plate and mounting

hardware. If an Expansion Rack is installed in the accessory area, remove the rack and discard.

6. Mount the communications module printed circuit board to the MJ-X base with six 6-32 x 7/16” standoffs,

Figure 5-4. Ensure that the membrane switch cable is folded over itself and under the communications module printed circuit board as shown in Figure 5-5.

Page 16

6-32 x 3/8" Screw (6)

Cover Pan

6-32 x 7/16" Male/Female Standoff(6)

PCB

MJ-X Base

Figure 5-4 Communications Module Installation in MJ-X

MJ-X Control Panel

Processor Board

Communications

Module

Membrane Switch Cable

Figure 5-5 Membrane Switch Cable Routing

7. Mount the communications module pan cover (if provided) with six 6-32 x 3/8” screws as shown in Figure 5-

8. Plug the ribbon connector into J105 on the MJ-X Processor Board as shown in Figure 5-6.

Page 17

MJ-XL Communications Module

9. If you are installing the RS-232/485 version of the communications module, plug the power connector into

J411 on the MJ-X Power Board as shown in Figure 5-6.

POWER Wdog Comm

Connector J105

GND RTN

Txd

Data

Rxd

Rxd Txd CTS RTS

Membrane Switch Cable

Processor Board

Connector J411

Power Board

Figure 5-6 MJ-X Communications Module Cable Routing

10. Feed the PDS cable through the PDS strain relief opening in the rear cover.

11. Reinstall the rear cover of the control panel, attaching it using the six screws.

12. Rotate the PDS strain relief plate to the closed position and tighten the screws for the strain relief plate.

13. Follow the procedure in section 6 Testing on page 14 to test the communications module.

Page 18

6 Verifying the Communications Module Installation

Once the MJ-XL Communications Module is installed in the MJ-XL (MJ-X) control panel, test the module as follows to ensure proper operation and performance.

1. Visually inspect the MJ-XL Communications Module for proper mechanical assembly and cable connections.

2. Apply power to the MJ-XL Control Panel and observe the LEDs on the communications module. The Power LED should light immediately and stay lit. After 10 to 15 seconds, the Watchdog LED should start flashing without a long pause between flashes, that is, about twice per second.

If this does not occur, check for the following:

§ The MJ-XL Control Panel is receiving power. Check that the front panel display is active.

§ The communications module is installed properly. Connections between the MJ-XL and the

Communications Module are correct. Disassemble, inspect, and reassemble the unit as required.

3. After verifying that the communications module is receiving power, perform the diagnostic tests described on the next page.

6.1 Performing the Initial Diagnostic Checkout

Prior to performing these tests, become familiar with operating and configuring the MJ-XL Control Panel. See the MJ-XL Voltage Regulator Control Panel Installation and Operations Manual (Siemens manual no. 21-115527-

010).

1. On the MJ-XL Control Panel, under the < DIAGNOSTICS > menu, go to the “CM Test:?” screen.

2. Press the Change key and toggle from “OFF” to “INTERN,” and then press the Save key. (If the password is requested, enter the password as described in the note below and proceed.) The “CM Test:?” screen should display “INTERN” for several seconds before changing to “OFF.” If the display does not change to “OFF,” then check the physical installation of the communications module and expansion rack again before proceeding.

Note: When you try to change the “CM Test:?” value, the MJ-XL Control Panel may request that the password be entered. If the default passwords are in effect, then the password for the Diagnostics menu is “3333.” For more information refer to the MJ-XL Installation and Operations Manual.

3. Once the “CM Test:?” screen value has returned to “OFF,” press the down arrow key to display the next data item, “CM TestStat.” This screen indicates the status of the communication module test. A value of xxx3 (where x may be 0-9 or a-f), indicates that the test passed. A value of xxx0, xxx1, or xxx2 indicates a failure.

• xxx0 indicates the test did not run at all. Run the test again, allowing extra time for the communications

module to power up. This should take about 15 seconds. The Watchdog LED will blink after the module successfully completes self test and initialization.

• xxx1 or xxx2 indicate an internal problem with the MJ-XL Communications Module. Contact Siemens for

assistance.

6.2 Performing the Loopback Diagnostic Test

The loopback test evaluates the MJ-XL for communications readiness. For this test, connect the transmit output to the receive input of the communications module. When testing the fiber optic module, ensure that the cable used meets the requirements outlined in section 6.1. When testing the RS-232/485 module, only the RS-232 portion of the circuit can be tested by connecting a wire from the transmit pin (Txd) to the receive pin (Rxd) of the screw terminal block connector.

1. Scroll to the “CM Test:?” data item in the <DIAGNOSTICS> menu on the MJ-XL Control Panel display.

Page 19

MJ-XL Communications Module

2. Press the Change key, then the up arrow key to select “LOOPBK.” If the password is requested, enter the password and proceed.

3. Press the Save key. It should display “LOOPBK” for several seconds before changing automatically to “OFF.” If this does not occur, then recheck the physical installation of the communications module and retry.

4. Once the “CM Test:?” screen displays “OFF,” press the down arrow key to display the “CM TestStat” data item. This screen gives the status of the communications module test. A value of xxx7 (where x may be 0-9 or a-f), indicates that the loopback test passed. A value of xxx0 - xxx6 indicates a failure.

• xxx0 indicates the test did not run at all. Run the test again, allowing extra time for the communications

module to power up. This should take about 15 seconds. The Watchdog LED will blink after the module successfully completes self test and initialization.

• xxx1 or xxx2 indicate an internal problem with the MJ-XL Communications Module. Contact Siemens for

assistance.

• xxx3 indicates the loopback test failed. Check the loopback connectors and repeat the test.

• xxx4, xxx5, or xxx6 indicates a communication problem. Contact Siemens for assistance.

7 Cabling the Communications Module to the Power System

Connect the communications modules using the recommended cable as described in sections 7.1 to 7.3 below. The following sections provide some general guidelines for cable selection and explain the different cable parameters. Make connections between the device and the communications unit with the appropriate connector.

Typically, RS-485 requires custom wiring to the other devices. Consult the device’s pin assignments to determine the applicable connections. Typically, a DE-9 or DB-25 will be needed for making RS-232 connections to the RTU, personal computer, or other device. Use the supplied Phoenix Contact Screw Terminal Block (MSTBT 2,5/8-ST5,08) for connections to the RS-232/485 module. Use an ST optical connector when making connections to the fiber optic module.

7.1 Fiber Optic Cable Type

The recommended cable is 62.5/125 µm diameter fiber optic cable with a maximum attenuation of 5dB/km at a wavelength of 820-850 nm. If this is not available use 50/125 µm diameter glass cable, but only for cable lengths less than 1500 feet. Use of 50/125 µm diameter cable requires that the range jumper J607 be set for long range. This will provide protection against under driving the receiver. When using 50/125 µm cable, install the long range jumper (J607) even for very short cable lengths.

A 100/140 µm diameter cable can also be used for cable lengths less than 1500 feet. Use of this cable requires that the range jumper J607 be set to normal. This setting will provide protection against overdriving the receiver.

Plastic cable is not recommended due to the coupling efficiency of the cable, which at short lengths will overload the optical receiver. In addition, the large cable attenuation normally associated with plastic cable limits the useful link lengths to a fraction of that achievable with glass cable.

7.1.1 Fiber Optic Cable Lengths

Calculate cable length by determining the output power of the transmitter (PTX) and the input receive level (Peak Input Power Logic Level Low Receiver Sensitivity, PRX). The difference between the two numbers is the optical power budget (PB’).

PB’ = PTX – P

For example, if transmitter output power is -16 dBm and the input receive level is -24 dBm, the optical power budget is then 8 dBm. Subtract from this value the fixed losses (i.e. connector losses, splice losses, P the real power budget (PB).

) to obtain

Loss

Page 20

PB = PB’ – P

Divide the result by the cable attenuation (Att) in dB/km to arrive at the maximum cable length. Note that the transmitter output power data given in the specifications already includes connector loss when using precision ceramic ST connectors.

Length = PB / Att

Loss

7.1.2 Fiber Optic Connector

The fiber optic cables (or “patch cords”) used with the MJ-XL Fiber Optic Communications Module must be terminated with ST style connectors and have a numerical aperture of 0.275 ± 0.015.

(If pre-terminated cables are not used, follow the instructions supplied by the manufacturer to attach the connector to the fiber cable using the cable type recommended in section 7.1.)

7.1.3 Fiber Optic Connections

When making connections to the transmitter and receiver inputs/outputs, ensure that the transmit output from one device is connected to the receive input of the next device. Figure 7-1 shows how to insert the connector. The tip of the cable on the ST connector must be clean and free of dust. Dust on the tip of the cable will cause signal attenuation.

Caution: Use extreme care when handling the fiber optic connector, especially the exposed ceramic ferrule.

Figure 7-1 Fiber Optic Connections

7.2 RS-485 Twisted-pair Cable

The following sections provide the information necessary to select and install cable between an MJ-XL Control Panel, RTU, and other field devices in an RS-485 network.

7.2.1 RS-485 Cable Type

Listed in Table 7-1 are the cable characteristics necessary for proper electrical performance in an RS-485 communications network. Use cable with a shield that provides 100 percent RFI/EMI coverage.

Page 21

MJ-XL Communications Module

FromRTUorotherdeviceTonextdevic

Table 7-1 RS-485 Cable Specifications

Characteristic Value Maximum/Typical

Impedance 120 ohms Typical Capacitance (pF/ft) 35 Maximum Cable Size 22 AWG Typical DC Resistance 17 ohms/1000 ft Maximum Velocity of Propagation 80% Maximum

7.2.2 RS-485 Cable Grounding

Ground the cable shield for all devices on the network. Ground the cable shield at only one end to prevent induced interference that may result from circulating ground currents. If a cable shield is grounded at both ends, a ground loop can exist between the components. This ground loop can cause induced interference that results in signal distortion. If there is a ground potential rise between the connected devices, connect the Signal Return (RTN) between the communication devices. Figure 7-2 illustrates the preferred field device connection method. See section 4.3.2 on page 7 for jumper considerations.

MJ-X Communications Module

Data

Shield grounded at other end only

RS-485 Twisted-Pair Cable RS-485 Twisted-Pair Cable

GND

Shield attached at this end only

Figure 7-2 RS-485 Connection

7.2.3 RS-485 Connector

The required connector for connecting to the MJ-XL RS-232/485 Communications Module is the Phoenix Contact Screw Terminal Block MSTBT 2,5/8-ST-5,08 or equivalent. Wire the connector as shown in Figure 7-2. This connector is supplied with the communications module and is shown in Figure 7-3.

.3"

12 Gauge Wire Maximum

Phoenix Contact Connector

COMBICON MSTB2,5/8-ST-5,08

Figure 7-3 Screw Terminal Block Connector

Page 22

7.2.4 RS-485 Cabling Considerations

FromRTUorotherdeviceTonextdevic

The cable used for connecting the Communications Module to other communication devices is a twisted pair of insulated conductors. The pair is twisted to minimize pickup of random signals between the conductors, particularly those signals induced by electromagnetic interference (EMI).

To further protect against external electrical interference, the pair is shielded by a grounded outer covering. The shield conducts radio frequency interference (RFI) to the ground, thus reducing its effect on the twisted pair. Concern over RFI and EMI is important given the high electrical current and electrically noisy environment through which the communication wires are routed.

Follow the rules below to properly install the RS-485 cables.

1. Connect all field devices in a loop technology so that all devices are connected to the master in case of a line break. The basic loop topology is shown below.

Twisted-pair

MJ-X

Cabling 4000 ft max. total

RTU

MJ-X

Figure 7-4 RS-485 Loop Topology

One of the advantages of the loop topology is that if a line is cut, communication is not interrupted. By completing the loop in the RS-485 cable, one break can be made anywhere in the line without compromising communication with the master device (RTU). To maintain redundancy, avoid open ended runs of the bus.

Each installation method (see Figures 2-4 to 2-6) has advantages and disadvantages. The loop method requires more cable that does the single-ended run method. This extra cable is needed to run from the last device on the run to the master device (RTU). The additional cable adds expense and shortens the total distance the farthest device can be located from the master device. The advantage of the loop method is in the ability to communicate with all devices when there is a break in the loop.

The single-ended run allows larger distances between the master device and the farthest slave device, but it does not allow the master device to communicate with devices on the far side of a break. This method also requires the use of terminating resistors.

2. A maximum of 32 devices may be connected in a single RS-485 bus with a total cable run no longer than 4000 feet.

3. Always ground the shield at only one end of a cable segment. For all devices, ground the cable shield at one end only to prevent induced interference that may result from circulating ground currents. If a cable’s shield is grounded at both ends, a ground lop can exist between the components. This ground loop can result in induced interference that causes signal distortion. The diagram below shows the proper method for terminating the shield at the Communications Module connector.

MJ-X Communications Module

Data

GND

Shield grounded at other end only

RS-485 Twisted-Pair Cable RS-485 Twisted-Pair Cable

Shield attached at this end only

Figure 7-5 Proper Shield Connections

Page 23

MJ-XL Communications Module

Figure 7-5 Proper Shield Connections

4. When the Communication Module is mounted in the MJ-XL Control Panel, it is grounded internally through the MJ-XL to the equipment ground. A separate connection to the equipment ground is not required.

5. The recommended twisted-pair cable for an RS-485 bus has a characteristic impedance of 120 ohms. Any change in the type of cable, or an open-ended length of cable, creates a discontinuity in the impedance and causes a reflection. Placing resistors that match the characteristic impedance of the cable at the open end of a twisted-pair stub eliminates reflection.

For long, single-ended runs (over 1000 Forwarding ft.), you may need to install a 120 ohm terminating resistor between the data (+) and (-) terminals of the farthest device from the RTU or master end. Adding the terminating resistor is not an absolute requirement, but using it minimizes reflected interference on the communication cable.

6. Do not route signal cabling parallel to power conductors. Wherever possible, place the communication cable perpendicular to the power conductor as shown below. Power conductors are any cables or bus conductors carrying currents greater than 20 amperes.

Magnetic Field

Around Conductor

Current

Flow

Communication Cable

Electric Power Conductor

Figure 7-6 Communication Cable Routing

Electrical current flowing through a conductor forms a magnetic field around the wire as shown above. Interference is coupled into the wires in the cable through electromagnetic fields. Just as current through a wire causes a magnetic field to form around it, a magnetic field can cause current to flow in a wire. This induction of current is a function of the geometry or orientation of the wires. If the communication cable is at a right angle with the power conductor, it is aligned with the direction of the magnetic field and no current is induced.

7. Follow these guidelines when you route communications cables between electrical equipment:

• Run communications cables in the same cable raceways (cable routes, cable trays, or cable gutters_) as

unshielded digital and analog signal cables up to 60 V.

• Run communications cables in the same cable raceway with shielded signal and supply cables up to 230

• Run communications cables 4 inches away from unshielded signal and supply cables of up to 230 V.

• Run cables with voltages greater than 230 V in separate ducts (routes, conduits).

Page 24

7.3 RS-232 Connections

The following section describes the connection requirements for RS-232 cable. This cable will allow you to connect the MJ-XL Control Panel to an RTU or personal computer.

Five of the standard RS-232 wires are used for this application.

• Signal Return (RTN)

• RXD

• TXD

• CTS

• RTS

Table 7-2 lists the connections that must be made to connect the MJ-XL RS232/485 Communications Module to a personal computer, RTU, or other supervisory device. The MJ-XL Communications Module defaults to no-handshaking-required mode. However, the communications module asserts RTS while it transmits data, but the module will ignore the CTS input signal.

Table 7-2 RS-232 Intelligent Electronic Device Wiring

MJ-XL RS-232/485

Communications Module

Personal computer, supervisory device, or other network device

RTN Signal Ground RXD TXD TXD RXD

Table 7-3 lists the connections that must be made to connect the MJ-XL RS232/485 Communications Module to a modem.

Table 7-3 Modem Wiring

MJ-XL RS-232/485

Modem

Communications Module

RTN Signal Return RXD RXD TXD TXD RTS RTS CTS CTS

“RXD” is an input for Data Terminal Equipment (DTE) and an output for Data Communications Equipment (DCE). “TXD” is an output for the DTE and an input for the DCE. Personal computer serial ports are configured as DTE and the modems are configured as DCE. The communications module RS-232 connections implement DTE.

Page 25

MJ-XL Communications Module

Signa

7.3.1 RS-232 Multi-drop Wiring

Multi-drop configurations require that the respective pins of the DTE devices be connected in parallel, Figure 7-7. The standard pin assignments for RS-232 connectors are shown in Figure 7-8.

Note: For Figure 7-7, the RTU port is wired as “DTE”. When networking devices together, make sure the RTU “data out” connects to the communications module Rxd, and the RTU “data in” connects to the communications module Txd.

RTU MJ-X MJ-X MJ-X

Signal Return

TX RX RX RX

RX TX TX TX

Signal Return

Figure 7-7 RS-232 Multi-drop Configuration

DCD

DE9

14 25

DB25

For ShieldedCable Connectors

1 2

Rxd

Txd DTR

4 5

Ground (Signal)

DSR

RTS

CTS RI

9 *

Shell(Frame Ground)

Signal

Ground (Frame)

Txd

Rxd RTS

4 5

CTS

DSR

Ground (Signal)

DCD DTR

20 22

Shell(Frame Ground)

Signal Return

7.4 RS-232/485 Connections

The screw terminal block connector is keyed for proper insertion. Figure 7-9 shows the proper connector orientation. Align the keys and insert the connector to interface to the RS-232/485 communications module.

Figure 7-8 RS-232 Connector Pinout

Page 26

GND RTN

Data

Rxd Txd CTS RTS

Figure 7-9 Screw Terminal Connection

7.5 Communications Module Configuration

Prior to using the MJ-XL Communications Module in the network, the communications module needs to be configured properly for communications. The < COMMUNICATIONS > menu of the MJ-XL Control Panel provides all the required communications configuration items for the communications module. Table 7-4 lists the communications menu items in the order in which they appear on the MJ-XL Control Panel.

1. Program the communications parameters of the MJ-XL Communications Module by pressing the Menu key twice to display the < METER > menu.

2. Then press the left arrow key until the < COMMUNICATIONS > menu appears. Use the up and down arrow keys to access the individual menu items.

3. To change the value of the parameter, press the Change key, and then use the scroll keys to toggle the choices or set the value for the parameter. Press the Save key after changing the value of a menu item to enter the changes, or press the Cancel Reset key to cancel the change.

Each time a configuration menu item is changed, the communications module is reset by the main MJ-XL Control Panel. This reset is part of the process of updating the communications module with the new configuration.

Table 7-4 Communications Menu Items

Menu Item Description Selections

Data Stat = XXXXX Data Port status Not Applicable (This is a Status

Item) DatPortBaud Data Port baud (in bits/second) 300, 1200, 2400, 4800, 9600, 19200 Data Parity Data Port parity None, Even Reg Id Regulator Identification 0 - 32,766 Protocol Communications Module protocol DNP3.0, 2200, 2200NOA, MJ3A A,

MJ3A B1, MJ3A B2, 2179, 2179

MJ-XL, 2179 5A, SPECIAL Comm Baud Communications Module baud (transmission rate) 300, 1200, 2400, 4800, 9600, 19200 Comm Parity Communications Module parity None, Odd, Even Comm Addr Communications Module address 0 – 65,535

Page 27

MJ-XL Communications Module

Resync Time Communications Module resync time (in

0-250

characters)

Tx En Delay Communications Module Transmit Enable Delay

0-250

(in milliseconds) DNP dl Confirm Confirm DNP Data Link No, Yes CM SW Repeat En Enable software auto-repeat in Comm Module No, Yes CM Vers Communications Module software version X.XX

Page 28

7.5.1 Communications Menu Item Descriptions Data Stat, DatPortBaud, and Data Parity

These menu items apply only to the Data Port located on the front of the MJ-XL Control Panel, and do not require modification.

Reg Id (Regulator Identification)

This item allows you to uniquely identify each regulator in the system. The Regulator Id is accessible as a data item via the communications module for most of the protocol selections.

Protocol

This item defines the protocol selection for the MJ-XL Communications Module. The selections are listed in Table 7-4 on page 22.

2200NOA is a variation of the 2200 protocol with the address field suppressed. It is provided for testing the MJ-X Communications Module with the MJXplorer software. The SPECIAL item allows a new protocol handler to be included in the Comm Module code without forcing a modification to the Main Processor code (for the protocol selection front panel screen).

Comm Baud

This menu item defines the data rate for the MJ-XL Communications Module. The standard asynchronous communications data rates are available for selection. For proper communications, the Comm Baud setting must match the baud setting of the other communicating device(s) in the network.

Comm Parity

This configuration item defines the parity selection for the communications module. For proper communications, the Comm Parity setting must match the parity setting of the other communicating device(s) in the system.

This parity selection will override any default or inherent parity defined in the selected protocol. [For example, the 2200 protocol specification document defines the parity as even. The Comm Parity configuration item allows even parity to be selected, but it also permits the system designer/installer to use an alternate parity selection if desired.]

Comm Address

This configuration item defines the communications address for the communications module. Each device connected on the communications link must have a unique communications address. The Comm Address setting must correspond with the address programmed into the RTU or other supervisory device so that it can request information from and write data to a particular MJ-XL Control Panel.

Resync Time

This configuration item defines the Communications Module resync time (in characters). This item is used for Communications Module protocols 2200 and 2179 to determine when one message ends and another message begins. If a new character is not received within the period specified by this parameter, the control panel assumes that the next received character is the start of a new message.

Tx En Delay

This configuration item defines the Communications Module Transmit Enable Delay (in milliseconds). Specifies the amount of time between the RTS output being activated and the start of transmit (output) data.

7.6 Troubleshooting Communications Problems

This section explains how to troubleshoot the MJ-XL Communications Module using the front panel LED indicators and the MJXplorer software. The MJXplorer software allows you to access the communications module parameters via the MJ-XL Control Panel.

Page 29

MJ-XL Communications Module

7.6.1 Using LEDs to Help Diagnose Communications Problems

The communications module’s Txd and Rxd LEDs can be useful indicators to help isolate system communications problems. The LEDs are directly activated by the transmit and receive signals and provide an immediate indication of line activity. If the Rxd LED is not illuminated, then no receive signal activity is being detected at the communications module Terminal Block connector.

If the Txd LED is not illuminated but the Rxd LED is illuminated, then the communications module is not responding to communication attempts. This may occur for a variety of reasons, including: 1) the communications module and/or MJ-XL Control Panel has not been configured properly, and 2) the unit is not being addressed.

If the Comm LED is not illuminated, then the communications module is not being addressed. If the Rxd LED is illuminated but the Comm LED is not illuminated, this indicates that the module is receiving the

transmission but does not detect its address in the message. Recheck the communications address, because it may not be set properly.

Verify that the MJ-XL communications configuration items have been set to match the system settings. (See section

6.5, Communications Module Configuration.)

7.6.2 Using MJXplorer to Troubleshoot Communications Problems

The MJXplorer software is a menu-driven application program that allows interfacing to the MJ-X Communications Module. Since the current version of MJXplorer does not support networking, only one MJ-X unit may be connected at a time. For connecting an MJ-XL Fiber Optic Communications Module to MJXplorer, the Fiber Optic auto repeat function must be disabled (since MJXplorer gets confused if it receives back its own transmissions.) See section 3.1.1 (Version 2) or section 4.2.1 (Version 1) for setting the Fiber Optic board jumpers.

A fiber optic communications module requires a Fiber Optic to RS-232 driver/receiver in order to perform these tests. The driver/receiver is an optical to electrical signal converter with an ST connector interface and an RS-232 interface. Connect the optical side to the fiber optic communications module via ST fiber optic patch cords. Connect the RS-232 interface to the personal computer, Figure 7-10.

Use MJXplorer to help pinpoint communications problems in a system. MJXplorer permits testing of the MJ-XL communications functions independent of other system components.

Once the physical connections are complete, select the “2200NOA” protocol from the MJ-XL front panel. In addition, set the Comm Parity and Comm Baud to match the MJXplorer settings. Use MJXplorer to verify that data can be retrieved from as well as written to the MJ-XL Control Panel.

Page 30

MJ-X Fiber Optic

Communications Module

In Out

Personal Computer Running MJXplorer

RS-232

DE-9

2 3

4 5 6 7

RS-232

DE-9

2 3

4 5 6 7

RS-232

DE-9

RS-232

Fiber Optic

OTx/ORx

Power Supply

MJ-X RS-232/485

Communications Module

Txd Rxd RTN

OTx

ORx

Figure 7-10 MJXplorer Troubleshooting Connections

Page 31

MJ-XL Communications Module

8 Specifications

This section contains the MJ-XL Communications Module specifications. Contained in this section are the parameters for both the fiber optic and RS-232/485 module. The data provided in the fiber optic section was obtained using 62.5/125 µm cable. Typical, maximum, and minimum lengths are given for normal and long range cable lengths. Except for the maximum and minimum parameters, the numbers provided are for room temperature. The maximum and minimum lengths are for temperature extremes.

8.1 Physical Dimensions

Height 8.4 inches ( 21.34 cm) Width 2.89 inches (7.34 cm) Depth 2.84 inches (7.21 cm)

Page 32

8.2 Fiber Optic Link Module Specifications

Transmitter

Maximum Output Power -13.0 dBm (Long Range) -16.0 dBm (Normal Range) Typical Output Power -16.0 dBm (Long Range) -19.0 dBm (Normal Range) Minimum Output Power -20.0 dBm (Long Range) -23.0 dBm (Normal Range) Numerical Aperture 0.49 Optical Port Diameter

Receiver

Peak Input Power Logic Level Low -24.0 dBm Min to -9.2 dBm Max Peak Input Power Logic Level High -40.0 dBm Max

System

Wavelength 820 nanometers (nominal) Connector Type ST Fiber Type Data Rate 5 Mbaud (design) 19.2 Kbaud (tested) Maximum Optical Power Budget 11 dBm (Long Range) 8 dBm (Normal Range) Typical Optical Power Budget 8 dBm (Long Range) 5 dBm (Normal Range) Minimum Optical Power Budget 4 dBm (Long Range) 1 dBm (Normal Range)

Link Lengths

Maximum Link Length 2.2 km (Long Range) 1.6 km (Normal Range) Typical Link Length 1.6 km (Long Range) 0.6 km (Normal Range) Minimum Link Length 0.8 km (Long Range) 0.2 km (Normal Range)

290 µm

Glass 62.5/125 µm, 5dB/m

Operating Temperature Range -40ºC to +85ºC (excluding cable)

8.3 RS-232/RS-485 Module Specifications

Parameter RS-232 RS-485

Data Rate (maximum) 9600 baud 9600 baud Distance (maximum) 50 ft 4000 ft Nodes (maximum) 72 32 Isolation 500 VAC, 1 minute 500 VAC, 1 minute

Page 33

Page 34

Siemens Power Transmission & Distribution Inc. P.O. Box 6289 Jackson MS 39288