Table of Contents
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L
MJ-X
™ Communications Module
Fiber Optic and RS-232/485
Installation Manual for MJ-X
POWER
Watchdog
Communications
POWER
Watchdog
Communications
Manual No. 21-115527-017
L
and MJ-X Control Panels
In
Fiber Optic Communications Module
RS - 232 / 485
Communications Module
RS-232/485 Communications Module
Fiber Optic
Out
Communications Module
Rxd
Txd
R
Data
R
G
N
T
x
D
N
-
+
d
Rxd
Txd
T
R
C
x
T
T
d
S
S
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Table of Contents
Related Manuals for Siemens MJ-XL
Summary of Contents for Siemens MJ-XL
- Page 1 MJ-X ™ Communications Module Fiber Optic and RS-232/485 Installation Manual for MJ-X and MJ-X Control Panels Fiber Optic Communications Module POWER Watchdog Communications Fiber Optic Communications Module RS - 232 / 485 Data Communications Module POWER Watchdog Communications RS-232/485 Communications Module Manual No.
- Page 2 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.
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Page 3: Table Of Contents
Table of Contents INTRODUCTION ............................1 ............................1 ESCRIPTION LED I ......................1 RONT ANEL NDICATORS TRANSMISSION METHODS........................2 ........................2 IBER PTIC RANSMISSION ..........................2 RANSMISSION 2.2.1 RS-232 ............................2 2.2.2 RS-485 ............................3 COMMUNICATION PROTOCOLS ......................4 INSTALLING THE COMMUNICATIONS MODULE IN MJ-X CONTROL PANELS....... - Page 4 OMMUNICATIONS TEMS 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.
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Page 5: Introduction
The manual also covers the procedures for connecting the module to a system of networked MJ-X Changer Control Panels. 1.1 Description The Siemens MJ-XL Communications Module is the communication interface used to connect the MJ-X 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. -
Page 6: Transmission Methods
• Watchdog when blinking steadily, indicates the MJ-X 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.) •... -
Page 7: Rs-232 Connection
MJ-X Communications Module 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. -
Page 8: Communication Protocols
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. -
Page 9: Installing The Communications Module In Mj-X
MJ-X 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-X Control Panels The MJ-X Communications Modules are mounted directly on the MJ-X Main Processor Board. -
Page 10: Mounting The Communications Module
Comm Mod PCB Power Cable (RS-232/485 only) 24-Pin Connector MJ-XL Main 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. -
Page 11: Rs-232/485 Version
MJ-X Communications Module Figure 4-4 RS-232/485 Version Jumper Locations Table 4-1 Fiber Optic Version Jumper Settings Jumper Name Position Function Selected State Description Auto Repeat Auto Repeat Auto repeat for mark 0 or mark 1 No Repeat Force 0 No Repeat Force 1 (no jumper installed at 1-2 or 2-3) Range Normal... -
Page 12: Replacing The Mj-X L Rear Cover
4.4 Replacing the MJ-X 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. -
Page 13: Installing The Communications Module In Mj-X Control Panels
MJ-X Communications Module 5 Installing the Communications Module in MJ-X Control Panels The MJ-X 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. -
Page 14: Rs-232/485 Version
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. -
Page 15: Mj-X Control Panel
MJ-X Communications Module Accessory Cover Plate PDS Strain Relief Plate 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. -
Page 16: Figure 5-4 Communicationsm
6-32 x 3/8" Screw (6) Cover Pan 6-32 x 7/16" Male/Female Standoff (6) MJ-X Base Figure 5-4 Communications Module Installation in MJ-X MJ-X Control Panel Processor Board Membrane Switch Cable Communications Module 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. - Page 17 MJ-X 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 Membrane Switch Cable Data Processor Board Connector J411 Power Board...
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Page 18: Verifying The Communications Module Installation
Prior to performing these tests, become familiar with operating and configuring the MJ-X Control Panel. See the MJ-X Voltage Regulator Control Panel Installation and Operations Manual (Siemens manual no. 21-115527- 010). 1. On the MJ-X Control Panel, under the < DIAGNOSTICS > menu, go to the “CM Test:?” screen. -
Page 19: Cabling The Communications Module To The Power System
• 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. -
Page 20: Fiber Optic Connector
’ – P Loss 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 = P / Att 7.1.2 Fiber Optic Connector... -
Page 21: Rs-485 Cable Grounding
MJ-X Communications Module Table 7-1 RS-485 Cable Specifications Characteristic Value Maximum/Typical Impedance 120 ohms Typical Capacitance (pF/ft) Maximum Cable Size 22 AWG Typical DC Resistance 17 ohms/1000 ft Maximum Velocity of Propagation 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. -
Page 22: Rs-485 Cabling Considerations
7.2.4 RS-485 Cabling Considerations 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. -
Page 23: Figure 7-6 Communicationc
MJ-X Communications Module Figure 7-5 Proper Shield Connections 4. When the Communication Module is mounted in the MJ-X Control Panel, it is grounded internally through the MJ-X to the equipment ground. A separate connection to the equipment ground is not required. 5. -
Page 24: Rs-232 Connections
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-X Control Panel to an RTU or personal computer. Five of the standard RS-232 wires are used for this application. •... -
Page 25: Rs-232 Multi-Drop Wiring
MJ-X Communications Module 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”... -
Page 26: Communications Module Configuration
Data Figure 7-9 Screw Terminal Connection 7.5 Communications Module Configuration Prior to using the MJ-X Communications Module in the network, the communications module needs to be configured properly for communications. The < COMMUNICATIONS > menu of the MJ-X Control Panel provides all the required communications configuration items for the communications module. - Page 27 MJ-X 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...
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Page 28: Communications Menu Item Descriptions
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-X 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. -
Page 29: Using Leds To Help Diagnose Communications Problems
MJ-X 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. - Page 30 MJ-X Fiber Optic Communications Module RS-232 RS-232 DE-9 DE-9 RS-232 Fiber Optic OTx/ORx Power Supply Personal Computer Running MJXplorer MJ-X RS-232/485 Communications Module RS-232 Txd Rxd RTN DE-9 Personal Computer Running MJXplorer Figure 7-10 MJXplorer Troubleshooting Connections...
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Page 31: Specifications
MJ-X Communications Module 8 Specifications This section contains the MJ-X 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. -
Page 32: Fiber Optic Link Module Specifications
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 0.49 290 µm... - Page 34 Siemens Power Transmission & Distribution Inc. P.O. Box 6289 Jackson MS 39288...