Allen Bradley Mass Storage Systems (Cat. No.
Table of Contents Before You Begin . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 1 Important . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Purpose . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Audience . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Vocabulary . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
ii Table of Contents Troubleshooting Your System . . . . . . . . . . . . . . . . . . . . . . 5 1 Chapter Objectives . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . General Troubleshooting Aids . . . . . . . . . . . . . . . . . . . . . . . . . . . For 1770-M11 System Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . For 1770-M11 System Only . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 1 5 1 5 2 5 3 Care of Your Mass Storage System . . . . . . . . . . . . .
Chapter 1 Before You Begin Important Read this chapter before you install your mass storage system. It will tell you how to use this manual properly and efficiently. Purpose We designed a family of mass storage systems with Winchester technology that interfaces with other Allen-Bradley products. you can store large quantities of data on hard disk or micro-floppy diskettes. There are three unique mass storage systems.
Chapter 1 Before You Begin Table 1.
Chapter 1 Before You Begin Peripheral Communication Module User’s Manual, publication 1775-6.5.4, (formerly 1775-808) PC/M Ladder Diagram Translator Software, publication 1770-6.5.6 (formerly 1770- 821) Data Cartridge Recorder User’s Manual, publication 1770-6.5.4, (formerly 1770- 806) We will be releasing new information to add to this manual. Complete the address card at the back of this manual to receive your publication updates.
Chapter 2 Hardware Features of the Mass Storage System Chapter Objectives In this chapter you will read about: hardware features of the mass storage systems internal components of the mass storage systems cables required for the mass storage systems Chapter 3 describes how to install your mass storage systems.
Chapter 2 Hardware Features of the Mass Storage Systems Hardware Features for the Mass Storage System Table 2.B identifies the hardware for each mass storage system. Table 1.
Chapter 2 Hardware Features of the Mass Storage Systems Front View Hardware Features Figure 1.1 shows the front view hardware for each mass storage system. Figure 1.1 Front View of Each Mass Storage System.
Chapter 2 Hardware Features of the Mass Storage Systems Restart Indicator (System Fault) This LED labeled RESTART lights red when either: the system cannot successfully start from the micro–floppy or Winchester there is an internal fault detected on the Disk Memory Interface Module (DMIM) Or when one of the following conditions occurs: download fault Random Access Memory (RAM) parity error system fault hardware malfunction module fault Off indicates normal operation.
Chapter 2 Hardware Features of the Mass Storage Systems Access Slot for Micro-floppy This is where you insert your micro–floppy. ATTENTION: Use only double–sided, double–density, micro–floppy diskettes in the micro–floppy disk drive. Using single–sided diskettes may permanently damage the drive heads of the micro–floppy disk drive. Back View Hardware Features This section describes back view hardware features for each mass storage system (Figure 1.2).
Chapter 2 Hardware Features of the Mass Storage Systems Parallel Channel In J21 This communication port labeled PARALLEL CHANNEL IN J21 allows you to connect the 1770–M10 system to: Allen–Bradley’s Advisor 2TM Color Graphic System Other 1770–M10 Systems 1770–M11 System Parallel Channel Out J20 This parallel communication port, labeled PARALLEL CHANNEL OUT J20 allows you to expand memory capacity by connecting another 1770–M10 system to this port.
Chapter 2 Hardware Features of the Mass Storage Systems Power Switch This is an on/off switch. We labeled it for international use: If you select Then power is And POWER indicator is 1 on green 0 off off Power Connect, 120/220V AC Electrical Card, Fuse Holder J19 This is a multi purpose module. The power connect is where you connect the power cable to a power source. We describe cables later in this chapter. The fuse holder houses a 5 A, 250V fuse for 120V operation.
Chapter 2 Hardware Features of the Mass Storage Systems The re–usable foam filter traps dirt from the air. When the filter is dirty, wash it with warm water and a mild detergent. Do not use an abrasive detergent. After you wash the filter, air dry it completely before replacing it. ATTENTION: Do not operate your mass storage system without the filter in place. Damage to your mass storage system may occur.
Chapter 2 Hardware Features of the Mass Storage Systems P/N 966289–01 Connects to: PARALLEL CHANNEL OUT J20 If you would like to make your own cables, appendix C contains the cable pin assignments. Here are the 3M Company part numbers for the connector cables.
Chapter 3 Installing Your Mass Storage System Chapter Objectives In this chapter you will read how to: install your mass storage system connect your mass storage system to other Allen-Bradley products Chapter 4 describes how to operate your mass storage system. Receiving Your System Your mass storage system comes in a re-usable shipping box. Save this box and foam packing material to transport your mass storage system to different locations.
Chapter 3 Installing Your Mass Storage System To mount your mass storage system, follow these steps: 1. Place the mass storage system on a flat surface. 2. Remove both front corner inserts (Figure 1.3) using a small screwdriver. Double-faced tape holds this corner insert to the mass storage system. Figure 1.3 Remove Both Front Corner Inserts Front corner insert 11958 The handles are optional hardware. Skip step 3 if you do not want this option. 3 2 3.
Chapter 3 Installing Your Mass Storage System Figure 1.4 Connect the Mounting Bracket to the Handle Mounting Bracket Handle Flat head Machine Screws 11959 Figure 1.5 Sure the Mounting Brackets with Self tapping Screws Self tapping Screws Side View of Mass Storage System 11960 Table Top Mount We place protective feet on the bottom of each mass storage system. This will guard the mass storage system against slippage while it is on your table or desk top.
Chapter 3 Installing Your Mass Storage System Product Connections Before you Connect the 1770 M1 System 3 4 Here is a connection summary for each mass storage system.
Chapter 3 Installing Your Mass Storage System Figure 1.6 Only Set Switches 1,2, and 3 for the 1770 M10 System ATTENTION: Never set the internal switch assembly for the 1770-M11 or 1770-M12 systems. Damage to your equipment may occur. Table 1.D 1770 M10 Switch Assembly Settings 1770 M10 System Unit Number SW1 SW2 SW3 0 ON ON ON 1 OFF ON ON 2 ON OFF ON 3 OFF OFF ON 4 ON ON OFF 5 OFF ON OFF 6 ON OFF OFF 7 OFF OFF OFF Now you are ready to connect to your Advisor 2 System.
Chapter 3 Installing Your Mass Storage System Connecting to the Advisor 2 System Figure 1.7 shows how to connect the Advisor2 Enclosure to a 1770-M10 system. Use the cable (P/N 966189-01) to connect each product and perform these steps: Figure 1.7 How to Connect the 1770 M10 System to the Advisor 2 Enclosure Advisor2 Front View Advisor2 Back View Advisor2 1770 M10 Mass Storage System P/N 966189 01 Connector Cable 13030 1. Match the power outlet voltage to the mass storage system’s voltage.
Chapter 3 Installing Your Mass Storage System Connecting to the PLC 3 Peripheral Communication Module Figure 1.8 shows how to connect the peripheral communication module to the 1770-M11 system. Use the twinaxial cable (cat. no. 1770-CD) to connect each product and perform these steps: Figure 1.
Chapter 3 Installing Your Mass Storage System Figure 1.9 How to Connect the Twinaxial Cable to the Peripheral Communication Module Remote Channel 1 Line 1 Line 1 Shield Shield Line 2 Line 2 Line 1 Remote Channel 2 Shield Line 2 Blue Remote Channel 1 Line 1 Shield Drain Shield Clear Remote Channel 2 Line 2 1770 XT Terminator 1770 CD Twinaxial Cable Connect this end to the 1770 M11 Mass Storage System 11965 3. 3 8 a.
Chapter 3 Installing Your Mass Storage System Figure 1.10 How to Connect the Twinaxial Cable to the 1770 M11 System SERIAL CHANNEL J22 1 SH IN 2 1 SH 2 OUT 11966 e. loosen three consecutive screws to one channel (either the IN or OUT channel) of the 1770-M11 system f. wrap the blue wire around the screw, labeled: 1; secure the screw g. wrap the shield drain wire around the screw, labeled: SHIELD; secure the screw h. wrap the clear wire around the screw, labeled: 2; secure the screw 4.
Chapter 3 Installing Your Mass Storage System Figure 1.11 You can Connect up to Three 1770 M10 Systems to the Peripheral Communication Module To another Peripheral Communication Module 1770 M11 Mass Storage System 1775 GA Peripheral Communication Module 1770 CD Twinaxial Cable Blue 1770 M10 Mass Storage System Shield Clear P/N 966189 01 Connector Cable To another 1770 M10 system 1.
Chapter 3 Installing Your Mass Storage System 1770-M10 system must have a unique unit number (Figure 1.13). Begin numbering with unit 1. Figure 1.13 Each 177 M10 System Must Have a Unique Unit Number Unit 1 1770-M10 Mass Storage System Unit 2 1770-M10 Mass Storage System P/N 966189-01 Connector Cable Unit 3 1770-M10 Mass Storage System P/N 966289-01 Connector Cable 11969 3. Match the power outlet voltage to the mass storage system’s voltage.
Chapter 3 Installing Your Mass Storage System Connecting Multiple Peripheral Communication Modules to One 1770 M11 System Here are some general examples of how to connect multiple peripheral communication modules to one 1770-M11 system (Figure 1.14). Place our 1770-XT terminator at each end of the communication link indicating where the communication starts and where it ends. Figure 1.
Chapter 3 Installing Your Mass Storage System Connecting to the Programmable Controller/Management System Figure 1.15 shows how to connect the Programmable Controller/Management System (PC/M) to a 1770-M12 system. Use the cable (P/N 966289-01) to connect each product and perform these steps: Figure 1.15 How to Connect the 1770 M12 System to the PC/M System PC/M Front View PC/M Back View PORT 0 PORT 1 1770-M12 Mass Storage System PORT 2 PORT 3 P/N 966289-01 Connector Cable 11971 1.
Chapter 3 Installing Your Mass Storage System Chapter Summary 2. Connect one end of the connector cable to the RS422 port on the back of the PC/M. 3. Connect the other end to J24 of the 1770-M12 system. 4. Plug the power cable into the power outlet. In this chapter you read how to: install your mass storage system connect your mass storage system to other Allen-=Bradley products The next chapter shows you how to begin operations for your mass storage system.
Chapter 4 System Start Up Chapter Objectives In this chapter you will read how to: change the electrical card for 220V AC operations begin operations for your 1770-M10 system begin operations for your 1770-M11 system begin operations for your 1770-M12 system Chapter 5 describes troubleshooting aids for your mass storage system. How to Change the Electrical Card for 220V AC Operations To change the electrical card for operation, follow these steps: 5. Locate the fuse holder.
Chapter 4 System Start-Up B FUSE PULL Fuse cover 7. Pull the table labeled Fuse Pull to the left. 8. Remove the fuse. 9. Use needle-noise pliers, grip the electrical card firmly and remove it from J19. C FUSE PULL FUSE PULL tab D FUSE PULL Electrical card 10. Re-insert the electrical card with the label “220V” side showing. 11. Push the tab labeled FUSE PULL to the right. 12. Insert the same fuse. 13. Slide the fuse cover to the right.
Chapter 4 System Start-Up 14. Insert a 220V AC power cord into J19. E FUSE PULL Power cord location If you are unfamiliar with micro-floppies, read appendix A before proceeding. System Start up Procedure for the 1770 M10 System After you’ve connected your mass storage system, you’ve ready to begin operations. make sure the POWER switch is at position 0. Perform the following steps for your 1770-M10 system (Figure 1.16): Figure 1.
Chapter 4 System Start-Up 3. Select position 1 of the POWER switch. The POWER indicator lights green; if it does not, refer to chapter 5 for troubleshooting aids. Refer to the Advisor2 Installation and Start-up Guide, publication 6171-6.7.2 for information on creating a database. System Start up Procedure for the 1770 M11 System Before you begin operations, you will need to know about the operating system program.
Chapter 4 System Start-Up Figure 1.17 System Start up Procedure for the 1770 M11 System 1770-M11 Mass Storage System - Back View Select communication rate SERIAL CHANNEL J22 BAUD RATE 1 2 3 IN OUT POWER Insert power cord Select position 1 MASS STORAGE SYSTEM Both indicators remain off 1. 2. 11973 Select the communication rate by sliding the BAUD RATE switch to: Position For Communication Rate 1 57.6kbaud for 10,000 ft (max) 2 115.2kbaud for 5,000 ft (max) 3 230.
Chapter 4 System Start-Up Important: If you are using a series A 1770-M11 system, you still must use the series A operating system diskette to load the operating system. If you intend to use a series B 1770-M10 system with a series A 1770-M22 system, you must: 1. load the 1770-M10 system through the 1770-M11 system using the series B operating system 2. load the 1770-M11 system using the series A operating system before using.
Chapter 4 System Start-Up 1. Select position 1 of the POWER switch. This initiates the following indicator response: POWER indicator lights green. Micro-floppy drive indicator lights red for about 11 seconds. Winchester drive indicator blinks once. Micro-floppy drive indicator blinks once. Both indicators remain off. 2. How the micro-floppy with the read/write access slot nearest the drive. Make sure that the labels are facing up. 3.
Chapter 4 System Start-Up Figure 1.19 System Start up procedure for the 1770 M12 System POWER Select position 1 Insert power cord MASS STORAGE SYSTEM M12 POWER Indicator lights green 11975 1. Insert the connector end of the power cord into J19. 2. Insert the plug into the power outlet. 3. Select position 1 of the POWER switch. The POWER indicator lights green; if it does not, refer to chapter 5 for troubleshooting aids. Refer to the PC/M User’s Manual, publication 1770-6.5.
Chapter 5 Troubleshooting Your System Chapter Objectives In this chapter you will find: general troubleshooting aids for each mass storage system. troubleshooting aids specific to the 1770–M11 system troubleshooting aids for the disk controller module located inside the mass storage systems General Troubleshooting Aids Symptom Probable Cause Recommended Action POWER indicator does not light. Burned out LED Power cable not properly connected. Failure with the power supply.
Chapter 5 Troubleshooting Your System For 1770-M11 System Only Symptom Probable Cause Recommended Action Operating system program will not load from the hard disk. No power to the 1770-M11 system. Connect power cable Winchester disk no longer contains a valid operating system. Load the operating system program from the micro-floppy. Winchester disk is not properly formatted. Format the Winchester disk. Refer to the 1775-GA Module User's Manual (publication 1775-808).
Chapter 5 Troubleshooting Your System For 1770-M11 System Only Symptom Probable Cause Improper interaction 1770-CD twinaxle cable not connected. between 1770-M11 system and the 1775-GA Twinaxial cable is not properly wired. modules. Peripheral communication module's remote channel is not configured for disk operations. Recommended Action Connect the twinaxial cable. Refer to chapter 3 for proper wiring instructions. Reconfigure the remote channel through LIST.
Appendix A Care of Your Mass Storage System Objectives In this appendix you will read: how to care for your Winchester disk drive shock and vibration specifications for your mass storage systems Micro-floppy information hardware features for the micro-floppy how to insert a micro-floppy into the mass storage system how to remove a micro-floppy from the mass storage system Care of Your Winchester Disk Drive The Winchester disk drive in your mass storage system is fragile.
Appendix A Care of Your Mass Storage System humidity and corrosive vapors Maximum Shock Without Incurring Physical Damage Operating: 3g Non-operating: 35g Shock levels beyond this specification could result in loss of oxide media, head misalignment, and/or permanent loss of all recorded data. Maximum Vibration Without Incurring Soft Errors Operating: Series A Systems Series B Systems 2 to 22 Hz 0.010 inch double amplitude 5 to 12 Hz 0.010 inch double amplitude 22 to 500 Hz 1.0g 12 to 250 Hz 1.
Appendix A Care of Your Mass Storage System of atmospheric pressure inside and outside the drive. The filter prevents the entry of particles as small as 0.3 microns. Mount your mass storage system away from areas which contain large amounts of dust. Humidity and Corrosive Vapors Water vapor causes corrosion if it condenses on the disk. Condensation has the greatest chance of occurring during a change from a warm humid environment to a cool dry one.
Appendix A Care of Your Mass Storage System Never Do not touch the recording surface. Do not place the micro floppies near magnets or magnetic objects. Magnetic fields can erase data. Do not expose to direct sunlight or place near heaters. Do not clean the micro floppies with chemicals. Do not place heavy objects on the micro floppies. Do not use paper clips to attach documents to the micro floppies. Do not mark the labels with pencils or ball point pens.
Appendix A Care of Your Mass Storage System Front View Hardware Features Figure 1.20 shows the front view hardware. Figure 1.
Appendix A Care of Your Mass Storage System protected from erasing, deleting, or accidental overwriting file information. When close (red shows), you can write (record data) onto the micro-floppy. Back View Hardware Features Figure 1.21 shows the back view hardware. Figure 1.
Appendix A Care of Your Mass Storage System Figure 1.22 How to Insert a Micro floppy into a Mass Storage System Mass Storage System Back View POWER 120V AC 50 60Hz 5A 250V FUSE J19 Select Position 1 When the micro floppy seats properly into the access slot this indicator lights green. Label faces up Indicator lights green 11979 4. Select position 1 of the POWER switch. If power is on, the POWER indicator lights green. If power is not on, then refer to chapter 5 for troubleshooting aids. 5.
Appendix A Care of Your Mass Storage System 6. Gently, but firmly, push the micro-floppy into the opening of the drive until you release it without it popping out. How to Remove Your Micro floppy ATTENTION: Do not turn the power off before you remove the micro-floppy. Damage to the micro-floppy and loss of data can occur. To remove your micro-floppy, follow these steps (Figure 1.23): Figure 1.
Appendix B 1770 M11 Mass Storage System Objectives In this appendix you will read about: hardware features of the 1770–M11 system file management features of the 1770–M11 system GA Basic command and function set Introduction The 1770M11 system provides your PLC3 Programmable Controller with responsive, high speed, high capacity, nonvolatile, mass storage capability.
Appendix B 1770-M11 Mass Storage System power supply operation with 120V AC or 220V AC front panel LED indicators to signal “power on” and “system fault” serial interfacing using the twinaxial cable for multidrop operation with up to eight PLC3 peripheral communication modules threeposition baud rate switch for speed/distance control while using the twinaxial cable interface SCSI output port for daisychain connection to an auxiliary 1770–M10 system; can support up to three 1770–M10 systems interfaces to th
Appendix B 1770-M11 Mass Storage System can copy all pertinent Winchester data to a set of floppies via the STORE command GA Basic Command and Function Set The commands listed below are executed by the Disk Memory Interface Module (DMIM) within the 1770M11 system. You initiate the commands via a terminal connected to the PLC3 peripheral communication module using GA Basic commands and functions.
Appendix B 1770-M11 Mass Storage System GA Basic file storage and retrieval command Copy Record oriented file management commands and functions Assign Deassign Allocate Open Deallocate Close Read Write Setrecord Getchar Outchar Testchar Testline Waitchar EOF (end of file) File protection commands Show/User Identify Changepass Setprot Adduser Addsystem B 4
Appendix B 1770-M11 Mass Storage System Remuser File and device backup commands Copy/Device Store Restore We describe the use of these commands and functions in the Peripheral Communication Module User’s Manual, publication 17756.5.4, (formerly 1775 808).
Appendix C Pin Assignments Objectives In this appendix we list the pin assignments for: Small Computer System Interface (SCSI) RS422 interface Small Computer System Interface (SCSI) Table 1.
Appendix C Pin Assignments Pin Number Signal Abbreviation 38 Acknowledge ACK 40 Reset RST 42 Message MSG 44 Selector SEL 46 Command Data C/D 48 Request REQ 50 Input/Output I/O All odd pins (except pin 25) connect to ground. Either leave pin 25 open or connect it to ground. Reference: American National Standard X3T9.2/82–2 RS422 Interface Table 1.
Appendix C Pin Assignments Pin Number Signal Abbreviation 15 Incoming Call IC 16 Select Frequency/Signaling Rate Selector 17 Terminal Timing TT 18 Test Mode TM 19 Signal Ground SG 20 Receive Common RC 21 Spare 22 Send Data SD 23 Send Timing ST 24 Receive Data RD 25 Request to Send RS 26 Receive Timing RT 27 Clear to Send CS 28 Terminal In Service IS 29 Data Mode DM 30 Terminal Ready TR 31 Receiver Ready RR 32 Select Standby SS 33 Signal Quality SQ 3
Appendix D Specifications Objectives In this appendix we list specifications for the: mass storage systems Winchester hard disk drive microfloppy disk drive microfloppy diskette internal power supply Mass Storage Systems Input Voltage Range 120V AC (90 to 132V AC) 220V AC (180 to 264 AC) Frequency: 47 to 63 Hz Input Current 120V AC Operation: 1.5A 22V AC Operation: 0.
Appendix D Pin Assignments Physical Height: 13.34 cm (5.25 in) Width: 42.88 cm (16.88 in) Depth: 42.42 cm (16.
Appendix D Pin Assignments Winchester Hard Disk Drive (Formatted) 1770 M10 Mass Storage System Storage: 2.5 Mbytes Per Surface: 5.6 Mbytes Per Track: 9216 Bytes Per Sector: 512 Bytes Sectors Per Track: 18 Data Transfer Rate: 625 kbytes/second Rotational Speed: 3600 RPM +1% 1770 M11 Mass Storage System Storage: 22.5 Mbytes Per Surface: 5.
Appendix D Pin Assignments Access Time Track–to–Track: 23 ms Average: 85ms Maximum: 205ms Latency: 8.
Appendix D Pin Assignments Functional Recording Density: 10,568 BPI Flux Density: 10,568 FCI Track Density: 550 TPI Cylinders: - Series A Systems: 306 - Series B Systems: 612 Recording Surfaces: 4 Heads per Surface: - Series A Systems: 2 - Series B Systems: 1 Disks: 2 Microfloppy Disk Drive Data Transfer Rate 250 kbits/second Access Time TracktoTrack: 3ms Average: 96ms Head Setting: 15ms Latency: 100ms (average) Microfloppy Diskette 3–1/2 inch Double density D 5
Appendix D Pin Assignments Double sided Formatted Storage Capacity: 655,360 bytes Internal Power Supply Our internal power supply meets CSA C22.2#514 (Canadian Standards Association) and UL478 (Underwriters Laboratory) standards. Mechanical Specifications Terminal 1 Terminal 2 Terminal 3 AC Hot AC Ground AC Neutral/Hot Terminal 1 Terminal 2 Terminal 4 Terminal 5 Terminal 6 Terminal 7 Terminal 8 Terminal 9 P.F.D.
Appendix D Pin Assignments Output Minimum Current Maximum Current Ripple Tolerance +12V 0.5A 1.5A 50mV +6% -12V 0A 0.
Appendix D Pin Assignments Input Voltage (all rated load conditions) 90 to 132V AC 180 to 264V AC Input Surge Current (115V AC, coldstart, peak current) 32 A Input Frequency Range 47Hz to 440Hz Input Line Regulation (low line to higher, full load) +0.3% to all outputs Output Power Range 10oC (50oF) 20W to 100W Overvoltage Protection Threshold +5V output: 6.25C +0.
Appendix D Pin Assignments Power Fail Detect 30mA (minimum) Adjustability (+5 output) 4.
Appendix E Glossary Objective This glossary defines terms pertaining to Allen–Bradley mass storage systems. For a broader glossary of programmable controller (PC) words, contact your Allen–Bradley sales engineer or distributor for publication SD60. Access: To locate data stored in a computer system or in computer–related equipment. Access Slot: An opening in which to insert a micro–floppy diskette. Address: 1) An alphanumeric value that uniquely identifies where data is stored.
Appendix E Glossary can also be interconnected in order to share data with other locations or with a central facility. The system may include terminals, programmable controllers, and/or intelligent I/O modules. Environment: In a systems context, the environment is anything that is not a part of the system itself. Knowledge about the environment is important because of the effects it can have on the system or because of possible interactions between the system and the environment.
Appendix E Glossary Full–Duplex Line: A communication line used in transmission of data to and from the central processing unit. A full–duplex line can carry data in both directions (to and from) simultaneously. Contrast with half–duplex line. Half–Duplex Line: A communication line used in transmission of data to and from the central processing unit. A half–duplex line can carry data in either direction (to or from), but in only one direction at a time.
Appendix E Glossary Off–line: Equipment or devices that are not connected to or in direct communication with the central processing unit. Contrast with on–line. On–line: Equipment or devices that are connected to or directly communicate with central processing unit. Contrast with off–line. Open System: Any system that interacts with its environment through input and output.
Appendix E Glossary Twisted Pair: Two insulated wires which are twisted around each other. Since both wires have nearly equal exposure to any electrostatic or electromagnetic interference, the differential noise is slight.
Index Symbols **Empty**, 2 2 A Access Slot, Micro-floppy, 4 7 Access slot Micro-floppy, A 3 Read/write, 4 7, A 7 Access time, Mass storage system, D 4 Advisor 2, Connection, 3 6 Audience, 1 1 connect, 1770-M12, 3 13 Corrosive vapors, A 2, A 3 D Data cartridge recorder, 2 6, B 2 Database, 4 4, 4 6 Diagnostic download fault, 2 4 B Baud rate Definition, 2 7 Switch, 2 7, 3 9, 4 5 Disk Controller Module, 2 8 Hard, 2 2, 2 8, 4 5, A 1 Indicators, 2 3, 4 5, 4 6, 4 8 Memory interface module, 2 2, 2 4 Micro-flo
I–2 Index Holder, 2 7, 4 1 Pull, 4 2 J22, 2 2, 2 6, 3 8 J23, 2 2, 2 6 J24, 2 2, 2 6, 3 14 G GA basic Command set, B 3 Function set, B 3 H Hard disk Drive, A 1 Specifications, A 1, A 2 Winchester, 2 3, A 1 Hardware Backview, 2 2 Features, 2 2 For 1770-M11, 2 2 For 1770-M12, 2 2 For 1779-M10, 2 2 Frontview, 2 3 Micro-floppy, A 6 Humidity, A 2 I Indicators Hard disk, 2 2, 4 5, 4 7 Micro-floppy, 2 2, 4 5, 4 7 Power, 2 2, 4 4, 4 5, 4 7, A 8 Restart, 2 4 Install Hardware, 3 1 Rack, 3 1 Table top, 3 1 Instal
Index Power Cable, 2 2, 2 8 Connect, 2 7, 4 3, 4 8 Indicator, 2 2, 2 3, 4 5, 4 8 Outlet, 3 11 Supply, 2 2, 2 8 Switch, 2 2, 2 7, 4 4, 4 7, 4 8, A 7 Power supply Electrical, D 6 Specifications, 2 8, D 6 Power supply specifications Adjustability, D 9 Input frequency range, D 8 Input line regulation, D 8 Input surge current, D 8 Input voltage, D 8 Output power range, D 8 Overvoltage protection threshold, D 8 Power fail protect, D 9 Power limit point, D 8 Transient response, D 8 Program Diskette, 2 9, 4 4 Oper
I–4 Index Vocabulary, 1 1 W Warnings defined, 1 2 Winchester Care of, 2 7, A 1 Disk, 2 2, 4 5, A 1 Hard disk drive, 4 5 Specifications, 2 8 Technology, A 1 Write Protect notch, A 5 Read access, 4 7, A 7
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