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D20/D200 Technical Overview

GE Grid Solutions

48

PRPI-019-3.00-10

GE Information

GE Part Number

Description

517-0219

D20SX 64 channel digital input termination board with separable compression blocks.

517-0327

D20SB 64 channel input termination board with barrier strips.

517-0330

D20SDI 24V, 64 channel digital input termination board with DB25 connectors

517-0331

D20SDI 48V, 64 channel digital input termination board with DB25 connectors

517-0262

D20SDI 125V, 64 channel digital input termination board with DB25 connectors

517-0241

D20SZ 48V, 64 channel digital input, high voltage termination board with compression
blocks.

517-0249

D20SZ 110V, 64 channel digital input, high voltage termination board with
compression blocks.

517-0266

D20SZ 220V, 64 channel digital input, high voltage termination board with
compression blocks.

2.4.7 D20A Analog Input Peripheral

Figure 30 D20A Analog Input Peripheral

The D20A Analog Input Peripheral, illustrated above, is a 32-point analog input interface
module. The D20A, which is capable of processing standard voltage and current inputs
continuously, has the following features:

•

Programmable Input Ranges:

A programmable gain instrument amplifier permits

programming of voltage input ranges. Ranges are stored in RAM on a per-point basis. (+/- 1,
+/-5, +/- 10 V scale).

•

Variable Scan Rate:

Programmable scan rate from 17.2 to 20.5 ms (50/60 Hz) on a per

module basis.

•

32 Differential Analog Inputs

and eight internal references using synchronous integrating-

type analog-to-digital (A/D) converters

•

A/D Conversion

provides excellent normal-mode rejection characteristics while maintaining

very good response times (approximately 550 ms total).

The D20A logic module plugs directly into a D20A termination panel, which provides three
screw compression type terminals for each input (+, -, shield) and sockets for analog scaling
networks. Provision is made for configuring analog loop supplies from the D20A power source,
or externally. Loop voltage is fused.

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Содержание D20

Страница 1: ...GE Grid Solutions D20 D200 Technical Overview PRPI 019 Version 3 00 Revision 10 GE Information...

Страница 2: ...f Allen Bradley Company Inc Belden is a registered trademark of Belden Wire and Cable Company Boeing is a trademark of The Boeing Company CDC is a registered trademark of Control Data Corporation Cege...

Страница 3: ...Input Peripheral 5 D20 High Voltage Peripherals 6 D20K4Z Termination Module 6 New Power Supplies 6 Multiple Language Support 7 1 System Overview 8 1 1 System Architecture 9 1 2 Hardware Design 9 1 3 D...

Страница 4: ...2 4 6 D20S Digital Input Peripheral 44 2 4 7 D20A Analog Input Peripheral 48 2 4 8 D20K Control Output Peripheral 53 2 4 9 Interposing Relay Panel 57 2 4 10 D20C Combination I O Peripheral 59 2 4 11...

Страница 5: ...4 6 Data Reduction and Summarizing Applications 83 4 7 Data Conversion Applications 84 4 8 Other DTAs 84 5 Frequently Asked Questions 85 5 1 What is the performance of the D20 and D200 85 5 2 What is...

Страница 6: ...12 D20EME Ethernet Memory Expansion 19 Figure 13 D20 D200 Chassis Mounted Power Supplies 19 Figure 14 D20A I O Peripheral 20 Figure 15 D20 Chassis non VME version 27 Figure 16 D20 Chassis VME version...

Страница 7: ...D20K Control Output Peripheral 53 Figure 35 Interposing Relays 58 Figure 36 D20 Power Supply 64 Figure 37 D200 Power Supplies 65 Figure 38 D 20 Link Example Configuration 71 Figure 39 D 20 Communicati...

Страница 8: ...Specifications 47 Table 9 D20S Options 47 Table 10 D20A Specifications 52 Table 11 D20A Options 53 Table 12 D20K Specifications 56 Table 13 D20K Options 57 Table 14 D20KI Options 58 Table 15 D20C Daug...

Страница 9: ...in your D20 D200 system 4 Application Software This section describes some of the substation automation and SCADA applications that are available for the D20 D200 5 Frequently Asked Questions This app...

Страница 10: ...purchasing or evaluating a remote terminal unit or substation control system It is intended for readers who have knowledge of substation automation equipment and applications Additional Documentation...

Страница 11: ...st sales requests To get access to the Technical Support Web site go to http sc ge com SASTechSupport Contact Technical Support The GE Grid Solutions Technical Support is open 24 hours a day seven day...

Страница 12: ...2 devices and operate over distances up to 4000 feet without the use of repeaters see note below The D20ME II is backwards compatible with VME and non VME versions of the D20 chassis and with the D200...

Страница 13: ...have been added to the D20 D200 product family D20AC AC Analog Input Peripheral The D20AC AC analog input peripheral provides AC analog computing and monitoring It has the following features Up to 132...

Страница 14: ...both sides of an interposer coil can be switched for additional control security For more information see section 2 4 I O Peripheral New Power Supplies GE Grid Solutions has introduced several new D2...

Страница 15: ...urrent A 1 A 1 A ISO V I 24 V A 24 V 3 A 48 V 1 A Supply Phased Out Drop In Replacement Alternative Replacement Part Number 580 0297 580 2007 580 2006 Input Voltage Range 100 300 VDC or 90 265 VAC 100...

Страница 16: ...System The D20 D200 provides substation server functionality in a mission critical substation hardened package The D20 D200 has a distributed architecture for gathering data from and controlling subst...

Страница 17: ...substation equipment IEDs for example local printers operator terminals and SCADA computers Field data acquired by the D20 D200 is maintained in the system database where it can be accessed and proce...

Страница 18: ...5 7 5 7 per node Each D20 D200 application has specific memory and processing requirements The number of applications that can be supported is therefore system specific and this will be determined dur...

Страница 19: ...PRPI 019 3 00 10 11 The D20 can support up to Two D 20 ports each supporting up to 31 I O peripherals without repeaters and 120 I O peripherals with repeaters 21 RS 232 or RS 485 ports 7 per processor...

Страница 20: ...n An example of a D20 rack layout is shown in Figure 5 1 10 20 30 42 40 Optional second 7 COM port panel UPC WESDAC D20A WESTERM D20A DUCT PANEL WESDAC D20S WESTERM D20S DUCT PANEL WESDAC D20K WESTERM...

Страница 21: ...programmable logic control without compromising performance GE Grid Solutions has installed D200 systems with point counts exceeding 80 000 Contact GE Grid Solutions for further information on engine...

Страница 22: ...nificantly more physical capacity Based on a 9 slot VME chassis the D200 illustrated in Figure 7 can support up to 4 D 20 ports each supporting up to 31 I O peripherals without repeaters and 120 I O p...

Страница 23: ...LY D200 CCU CHASSIS UPC DUCT PANEL DUAL MODEM PANEL POWER BAR 1 10 20 30 42 40 POWER BAR DUCT PANEL WESDAC D20K WESTERM D20K DUCT PANEL WESDAC D20K WESTERM D20K DUCT PANEL WESDAC D20S WESTERM D20S DUC...

Страница 24: ...r Supply Media Interface Cards Modem 5 25 in 8 5 in 19 0 in Figure 9 D20 Perspective Drawing The D20 chassis is available in a single slot Eurocard version or a five slot VME version The single slot c...

Страница 25: ...s without repeaters and 480 I O peripherals with repeaters 49 RS 232 or RS 485 ports seven per main processor Two Ethernet ports 1 6 2 Main Processor The design of the D20 main processor has evolved w...

Страница 26: ...the substation equipment Processes maintenance commands received through the WESMAINT port The D20ME interfaces with substation equipment through D20 I O Peripherals RS 232 ports eight RS 232 ports pe...

Страница 27: ...odule include Ethernet only Memory only Ethernet and Memory For more information see section 2 3 Ethernet Memory Expansion EME Kit 1 6 4 Power Supplies The D20 switch mode power supply installed in th...

Страница 28: ...6 5 Modems GE Grid Solutions offers a wide range of D20 D200 modems to provide communication between the D20 D200 and SCADA host computers or remote devices including proprietary WESDAC modems and th...

Страница 29: ...ion are described in A Specifications and Supported Standards 1 8 Auxiliary Equipment GE Grid Solutions offers a selection of auxiliary equipment to support specific substation applications including...

Страница 30: ...intenance Software The D20 D200 is equipped with a range of maintenance utilities to assist the user in configuring testing and monitoring the system SGConfig a PC based tool for configuring D20 D200...

Страница 31: ...10 23 Software configuration guides Maintenance utility user guides Site Specific Manual consisting of Bills of Material Rack layouts Configuration tables Termination lists Cabling schematics Module...

Страница 32: ......

Страница 33: ...n peripheral I O modules for easy access to field terminations displays and auxiliary hardware Electronics and logic circuits are easily removed from fixed I O termination panels without powering down...

Страница 34: ...emblies are 19 rack mountable and based on Eurocard VME VersaModular Eurocard standards The chassis provides mounting and interconnection for the following D20 modules Main processors Power supplies M...

Страница 35: ...cess to the D20 system 2 1 3 2 D20 Chassis VME The VME version of the D20 chassis is equipped with five horizontal expansion slots for VME compatible modules Figure 16 D20 Chassis VME version The VME...

Страница 36: ...ess 2 1 4 Peripheral I O Module Assembly D20 peripheral I O modules consist of two separate assemblies a logic panel and a field termination panel See Figure 18 The logic panel contains all of the log...

Страница 37: ...the power remains on Once the new unit is installed the D20 D200 automatically downloads the appropriate operating software and database parameters to the module to make it operational 2 1 5 Environme...

Страница 38: ...the main processor Note In the following sections references to the D20ME apply also to the D20ME II unless explicitly stated 2 2 1 Hardware The D20ME is an advanced single board VME bus compatible c...

Страница 39: ...ermines the importance of and controls interrupts from the serial ports the D 20 Link HDLC chip and the real time clock Serial I O is the communications center of the D20ME It consists of two D 20 HDL...

Страница 40: ...types of firmware BootROM and flash applications BootROM contains the software needed to start up a D20 and diagnostic applications Application software consists of a base system that includes the op...

Страница 41: ...g system code into RAM so that it can be accessed more quickly From this point on all resident firmware and supplied custom applications run from either 32 bit wide RAM or 32 bit wide flash The system...

Страница 42: ...tput operation requests from DPAs to DCAs WESMAINT WESMAINT is a maintenance facility that resides on the D20 and D200 For a more detailed description see section 3 3 WESMAINT System Library Resources...

Страница 43: ...Reciever GPS Satellites D20ME Processor IRIG B Distribution of time information to substation devices and peripherals Figure 20 D20 D200 Time Synchronization To support time synchronization the D20 D2...

Страница 44: ...s VME based D20 and D200 systems to be connected directly to any 10 Mbps Ethernet based network Available configurations of the D20EME module include Ethernet only Memory only Ethernet and Memory Memo...

Страница 45: ...configuration stored in RAM The base application code is stored on the D20 D200 At power up the configuration and application code are downloaded to the peripheral module from the D20 D200 main proces...

Страница 46: ...ital inputs 8 digital outputs optional 16 analog inputs or 8 analog inputs and 8 analog outputs standard version DB25 D20CX 16 digital inputs 8 digital outputs optional 16 analog inputs or 8 analog in...

Страница 47: ...n mate with board mounted headers on the D20 I O Peripheral This is illustrated in Figure 25 with the board mounted header shown on the right and the cable plug shown on the left Figure 25 D20 I O Per...

Страница 48: ...ripheral I O Block Diagram The fourth block Input Output is specific to the function of the module The circuit blocks are MCU Control Performs data processing and storage device addressing and system...

Страница 49: ...re on the modules Common code is resident in the peripheral modules and device specific base applications are stored in the D20 main processor then downloaded to the peripheral modules at boot up 2 4...

Страница 50: ...I O peripherals Peripheral Communications The resident peripheral communication process functions continuously requesting and receiving data from the I O peripherals then forwarding these over the HDL...

Страница 51: ...downloaded to the peripherals at the same time Peripheral base applications communicate with the D20 main processor through the common code communications process then over the D 20 Link 2 4 5 I O Pr...

Страница 52: ...or field terminations The D20S termination panel is jumper configurable so that contact wetting can be supplied from either the D20S power source or from an external source Wetting voltage is fused an...

Страница 53: ...anges are placed in a separate FIFO buffer and reported upon request An anti chatter filter function prevents one or more chattering points from filling the FIFO buffer Each COS and SOE FIFO buffer is...

Страница 54: ...h the chatter filter is ON is programmable on a per point basis from 0 to 65535 in increments of 1 ms The maximum expected number of state transitions is programmable on a per point basis from 0 to 25...

Страница 55: ...Wetting 12 24 48 125 V Overload Rating 500 VDC common mode to ground Component Isolation Rating 1500 Vrms Dielectric Rating 1000 VDC D 20 Link Ports 2 Maintenance Port 9600 baud RS 232 Power Requireme...

Страница 56: ...Analog Input Peripheral The D20A Analog Input Peripheral illustrated above is a 32 point analog input interface module The D20A which is capable of processing standard voltage and current inputs conti...

Страница 57: ...6 17 24 25 32 Voltage References 0 1 5 10 Temperature Transducer Reference PGA PTM MCU Voltage to Frequency Converter PPI Opto Gain Select Opto Input Select OPTO PPR OPTO SYNC Switch Mode Power Supply...

Страница 58: ...ll of the 32 inputs within a scan period of 550 ms 60 Hz to 656 ms 50 Hz Voltage References The D20A uses a high precision voltage reference chip to provide seven on board references for auto calibrat...

Страница 59: ...d inputs and reference points are multiplexed Inputs are scaled by a programmable gain amplifier then fed into a voltage to frequency converter that is part of the analog to digital conversion circuit...

Страница 60: ...2 bytes EEPROM Inputs 32 differential inputs typical 5 10 V 1 2 5 5 10 20 mA Input Impedance 44 Mohm 5 VDC Overall Accuracy 0 05 voltage 0 1 current Temperature Coefficient 10 ppm per C Resolution 12...

Страница 61: ...ntrol Output Peripheral The D20K is a 32 point control output interface module The 32 output drivers can be arranged in several hardware software configurations depending on the system requirements Th...

Страница 62: ...h interposing relays A standard D20KI interposing relay panel equipped with P B KUEP and KUP interposing relays 10 A at 150 V DC and 10 A at 240V AC respectively is used in conjunction with a D20KR te...

Страница 63: ...main functions Control Block Processor makes the control blocks active sets a timer if required and sets bits in the relay driver to activate the relay on the next pass of the relay driver Relay Drive...

Страница 64: ...rs 16 R L pairs 32 isolated Form C contact outputs Optional 32 isolated open drain outputs rated 150 mA 60VDC Contact ratings types typical D20K Momentary relays 60 W max 3 A max 220 VDC max 1 Form C...

Страница 65: ...on when the particular control point is enabled 2 4 8 6 D20K Options The following D20K options are currently available Table 13 D20K Options GE Part Number Description 508 0101 WESDAC D20K 20 60 VDC...

Страница 66: ...rmination Board Options The following D20KI termination board options are currently available Table 14 D20KI Options GE Part Number Description 517 0146 D20 KI compression termination 517 0430 D20KI1X...

Страница 67: ...rocesses similar to those performed by the other D20 I O modules but at a faster clock speed required to meet the increased processing power demand The same technology is used on the D20C as on the ot...

Страница 68: ...full scale inputs Input Impedance 44 Mohm 5 VDC Common Mode Rejection 60 Hz 95 dB Normal Mode Rejection 60 Hz 60 dB Over voltage Rating 35 VDC normal mode Analog Inputs Outputs Physical Plug in daught...

Страница 69: ...20C 20 60 VDC standard 504 0003 WESDAC D20CHV 40 150 VDC high voltage 517 0169 D20C termination board with compression blocks for status controls and analogs Includes DB25 connector for D20KI KI2 inte...

Страница 70: ...ctor frequency kWh kVARh kVAh and symmetrical components Power quality data THD total harmonic distortion 21 st harmonic DSP Memory 24 bit program 16 bit point data 16 MHz clock 1K x 16 bit internal d...

Страница 71: ...AC and WESTERM options are currently available Table 19 D20AC Options D20AC Option Description WESDAC D20AC 40 150V 511 0104 Standard version of the AC analog input peripheral logic panel supporting u...

Страница 72: ...517 0381 however the unit does not support power through the D 20 Link WESTERM D20AC 3VT 9CT 517 0372 Similar to the 517 0382 however the unit does not support power through the D 20 Link WESTERM D20...

Страница 73: ...Power Supplies Type Part Number Input Output Mounting Chassis mounted D20 580 2004 20 60 VDC 5 V 7 A 12 V 2 A 12 V 1 A 24 VDC 3 A Chassis Chassis mounted D20 580 2005 20 60 VDC 5 V 7 A 12 V 2 A 12 V...

Страница 74: ...521 0107 90 250 VAC 48 VDC 120 W Rack mounted Redundant 580 0719 115 VAC 125 VDC 24 VDC 5A Rack mounted Redundant 580 0741 230 VAC 48 VDC 48VDC 2 5A Rack mounted Redundant 580 0789 115 VAC 48 VDC 48...

Страница 75: ...ous operation on unconditioned lines Available as a 19 rack mount assembly GE Part Number 520 0090 or as a 3U vertical mount module that can be installed in the D20 D200 chassis GE Part Number 520 012...

Страница 76: ...half or full duplex Equipment Interface RS 232 CCITT V 24 data interface Data Rate 300 and 1200 bps Transmit and Receive Frequencies Bell 202 Mark 1200 Hz Space 2200 Hz CCITT V 23 Mark 1300 Hz Space 2...

Страница 77: ...vices over several types of communications facilities Table 24 D20 D200 Communications Links Type Properties RS 232 Each installed D20ME and D20ME II provides seven RS 232 serial ports In the D20ME II...

Страница 78: ...nnels using one of the following formats 10BASE T Provides two RJ 45 connectors for connecting to CAT5 or greater UTP cabling 10BASE2 Provides two BNC connectors for connecting to thin coax cabling 10...

Страница 79: ...mends the use of a fiber optic cable For more information on planning a D 20 Link refer to Appendix G D 20 Link Installation D20 modules are configurable in star or daisy chain networks Refer to Figur...

Страница 80: ...To downstream I O Peripherals Figure 39 D 20 Communications Interface The D 20 Communication Interface DCI provides a 1 1 interface between an RS 485 serial D 20 Link and one fiber optic D 20 Link The...

Страница 81: ...e 41 DCI Modes of Operation 2 8 4 D 20 Fiber Optic Splitter The D 20 Fiber Optic Splitter DFS is used to break out the D 20 Link into four separate D 20 Links for applications with clusters of periphe...

Страница 82: ...owing specifications IEEE 802 standard LAN cables Belden 9891 Ethernet or Alpha 9852 Ethernet 4 pair 22 AWG 0 644mm stranded tinned copper Outer jacket PVC 0 032 thick Conductors Color coded PVC 0 01...

Страница 83: ...ower This power may be supplied from standard D 20 cable if available Remote D20 peripherals are normally powered via the D 20 line using a 20 AWG 0 812mm cable Typical power requirements for D20 modu...

Страница 84: ...nel set either automatically or manually determines which D20 D200 is active On power up the active D20 D200 initializes to an Active Polling state acquiring data from all substation devices and any l...

Страница 85: ...lly forced from the RS 232 Switch Panel or through the WESMAINT maintenance interface 2 9 2 D 20 Link Redundancy In addition to equipment redundancy the D20 D200 can be equipped to provide D 20 Link r...

Страница 86: ...l WESDAC board As shown in Figure 46 each D 20 port in the D20 D200 is physically connected to each I O peripheral This connection could be implemented in a single set of cables however this would lim...

Страница 87: ...tly on a 19 rack and one that is installed directly onto a D20 chassis as shown in Figure 47 Figure 47 Data Display Panel 2 10 3 Fiber Optic Interfaces Fiber optic communications links with greater no...

Страница 88: ...will display all of the configurable applications for the device The device window has four tabs Data Collection Applications Data Translation Applications System Point Database Applications Data Pro...

Страница 89: ...rtion is used to view data or to verify that the board is functioning correctly by for example forcing a control point and then checking to see whether the control operation took effect This monitor f...

Страница 90: ...ays with external terminations as master trip close relays Setpoint Adjustment DTA Adjust setpoints based on control request durations or analog input values Tap Position Indication DTA Translate stat...

Страница 91: ...Accumulator Freeze DTA Coordinate freezing of accumulator groups Event Storage DTA Store history of current values status and time tags of analogs and accumulators for up to 7 days Historical Analog D...

Страница 92: ...analog output requests into a group of BCD encoded control points Accumulator Delta to Analog DTA Convert accumulators to analog values for protocols that do not support counters Time Stamp DTA Inter...

Страница 93: ...have been taken into account to maximum the performance of your D20 D200 system 5 2 What is the difference between the D20 and the D200 The D200 which uses the same hardware modules as those used in...

Страница 94: ...to Four D 20 ports two per main processor supporting up to 240 I O peripherals 49 RS 232 or RS 485 ports seven per main processor Two Ethernet ports For example On each of its four D 20 ports the D20...

Страница 95: ...EC 60068 2 6 Vibration 10 150Hz 1g 10 150Hz 1g IEC 60068 2 27 Shock Class 1 15g 3 axis Class 1 15g 3 axis IEC 60068 2 29 Bump Class 1 10g 3 axis 2000 bumps axis TBD IEC 60068 2 78 Damp Heat Steady Sta...

Страница 96: ...ity to Conducted Common Mode Disturbances 0 150 kHz TBD Level 4 30 V 300 V 1 sec EN 61000 4 17 Immunity to Ripple on DC Power Port Level 4 15 ripple TBD EN 61000 4 29 DC Supply Interruptions 40 70 dip...

Страница 97: ...rmation IEEE C37 1 1994 IEEE Standard Definition Specification and Analysis of System used for Supervisory Control Data Acquisition and Automatic Control Comply Comply ISO 9000 Quality Systems Specifi...

Страница 98: ...C DNP 3 UDP IP PG E Rev 11 Allen Bradley ANSI X3 28 ESCA WELCO Rockwell ASW Ferranti Mark IIA SANGAMO BBC 7200 Ferranti TRW 9550 SCADA Consultants Sensa Boeing BETAC GETAC 7020 Ferranti TRW S9000 SES...

Страница 99: ...rotocols supported by the D20 D200 8979 ACCUSONIC FLOW METER Allen Bradley ANSI X3 28 DCA BECO 2200 BOEING 3050 CDC TYPE II COOPER 2179 DNP V1 00 QUANTUM METERS DNP V3 00 DPU ENVIC DMCP 20A FLUKE TEMP...

Страница 100: ...20A 7 00 D20K 4 00 D20K O B Relay 0 288 D20C 5 00 D20C A I 1 50 D20C I O 1 50 Rack Modem 1 44 Universal Protocol Converter 0 680 48 V Status Point 0 264 24 V Status Point 0 132 130 V Status Point 0 71...

Страница 101: ...es Yes D20M GreenSpring N A Yes Yes D20M MicroMemory N A Yes Yes D20M GreenSpring MicroMemory N A Yes Yes D20ME D20M EME N A Yes Yes D20ME D20M MicroMemory N A N A Yes D20ME D20M GreenSpring MicroMemo...

Страница 102: ...or typical RS 485 wire gauges are 22 AWG 0 644mm wire 016 ohms ft 20 AWG 0 812mm wire 010 ohms ft Ensure that the lower threshold of 20 V on each peripheral is met WESDAC Power Converters rated at 20...

Страница 103: ...of units of type x X Power Consumption of X module see D Power Consumption D20 Modules where X M S A K R C C A I C I O COM UPC SP I Constant Current Vp Peripheral Supply Voltage 24 48 130 V Vd Voltag...

Страница 104: ...nAA nSS 3 x A 2 x S 3 x 5 W 2 x 3 W 21 W I PTotal Vp 21 W 48 V 0 44 A Vd I x Rs 0 44 A x 0 016 ohms ft 0 00704 V ft Dmax MIN Vp Vt 2 x Vd or 1000 feet MIN 48 V 20 V 2 x 0 00704 V ft or 1000 feet MIN...

Страница 105: ...put configurations 54 specifications 56 D20 ME 18 30 firmware 32 D20 ME II 4 18 30 firmware 32 D20 S 44 specifications 47 D20 D200 chassis 16 communications 69 Communications Interface 72 detailed des...

Страница 106: ...otocols 91 Interposing Relays 57 IRIG B 34 M Modems 67 specifications 68 P Power calculations 95 Power Supplies 6 19 64 PROMAINT 81 R RS 485 support 69 74 94 S Software application 1 8 82 maintenance...

Страница 107: ...pdated maximum number of processor boards for VME chassis D20 units 5 Jul 21 2011 Updated Technical Support and Customer Service contact information 6 Oct 7 2013 Correction made The D20 can support up...

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