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Keithley 7020 Instruction Manual

Manual is about: Digital I/O Interface Card

Summary of 7020

  • Page 1

    Model 7020 digital i/o interface card instruction manual a g r e a t e r m e a s u r e o f c o n f i d e n c e test equipment depot - 800.517.8431 - 99 washington street melrose, ma 02176 - testequipmentdepot.Com.

  • Page 2: Warranty

    Warranty keithley instruments, inc. Warrants this product to be free from defects in material and workmanship for a period of 1 year from date of shipment. Keithley instruments, inc. Warrants the following items for 90 days from the date of shipment: probes, cables, rechargeable batteries, diskettes...

  • Page 3

    Model 7020 digital i/o interface card instruction manual ©1995, keithley instruments, inc. All rights reserved. Cleveland, ohio, u.S.A. Second printing, march 2001 document number: 7020-901-01 rev. B.

  • Page 4: Manual Print History

    Manual print history the print history shown below lists the printing dates of all revisions and addenda created for this manual. The revision level letter increases alphabetically as the manual undergoes subsequent updates. Addenda, which are released between revisions, contain important change inf...

  • Page 5: Safety Precautions

    Safety precautions the following safety precautions should be observed before using this product and any associated instrumentation. Although some in- struments and accessories would normally be used with non-haz- ardous voltages, there are situations where hazardous conditions may be present. This ...

  • Page 6

    The instrument and accessories must be used in accordance with its specifications and operating instructions or the safety of the equip- ment may be impaired. Do not exceed the maximum signal levels of the instruments and ac- cessories, as defined in the specifications and operating informa- tion, a...

  • Page 7

    Digital i/o capability: forty independent inputs. Forty independent outputs. Output specifications: configuration: 40 open collector drivers with factory installed 10k Ω pull up resistors. Pull-up resistors can be removed when driving external pull-up devices. Each driver has an internal fly- back d...

  • Page 9: Table of Contents

    I 1 digital i/o configuration 1.1 introduction......................................................................................................................................................... 1-1 1.2 digital outputs................................................................................

  • Page 10

    Ii 4 service information 4.1 introduction ........................................................................................................................................................ 4-1 4.2 handling and cleaning ..............................................................................

  • Page 11: List of Illustrations

    Iii 1 digital i/o configuration figure 1-1 output configurations for pull-up devices ................................................................................................. 1-2 figure 1-2 output configuration using pull-up resistance ...........................................................

  • Page 12

    Iv.

  • Page 13: List of Tables

    V 2 card connections and installation table 2-1 pull-up resistors identification .................................................................................................................... 2-3 table 2-2 output channel terminal identification ....................................................

  • Page 14

    Vi.

  • Page 15: Digital I/o Configuration

    1 digital i/o configuration 1-1 1.1 introduction this section covers the basic digital input and output config urations for the model 7020. Connection information for these configurations is provided in section 2 of this manual, while operation (front panel and ieee-488 bus) is explained in section ...

  • Page 16

    Digital i/o configuration 1-2 driver f Ω jumper 5.3v output v int solenoid or relay coil 7020 a. Using internal voltage source (5.3v) driver f Ω jumper v output v int solenoid or relay coil 7020 b. Using external voltage source (25v maximum) figure 1-1 output configu ations for pull-up devices drive...

  • Page 17

    2 card connections and installation 2-1 2.1 introduction warning the following connection and installa- tion procedures are to be performed by qualified service personnel. Failure to recognize and observe standard safety precautions could result in personal in- jury or death. Note all input and outp...

  • Page 18

    Card connections and installation 2-2 w104 5.3v v ext1 1 8 bank a w103 5.3v 9 16 bank b w102 5.3v 17 24 bank c w101 5.3v 25 32 bank d w100 5.3v 33 40 bank e v ext2 w105 figure 2-1 voltage source jumpers for output channels figure 2-2 component locations — scanner board r184 r183 w100 w101 w102 r182 ...

  • Page 19

    Card connections and installation 2-3 2.4 pull-up resistors when interfacing outputs to high-impedance devices (i.E. Logic devices), pull-up resistors are used to achieve the ap- propriate logic level. These resistors are installed at the fac- tory. When interfacing digital output channels to pull-u...

  • Page 20

    Card connections and installation 2-4 2.6 card removal to remove the card assembly, loosen the safety ground screw, unlock it by pulling the latches outward, then pull the card assembly out of the mainframe. Remember to handle the card assembly by the edges and shields. 1 screw 2 unlock card 2 1 loc...

  • Page 21

    Card connections and installation 2-5 table 2-2 output channel terminal identificatio output channel bank connector pin no. Output channel bank connector pin no. Out1 out2 out3 out4 out5 out6 out7 out8 out9 out10 out11 out12 out13 out14 out15 out16 out17 out18 out19 out20 a a a a a a a a b b b b b b...

  • Page 22

    Card connections and installation 2-6 2.8 typical connection techniques keithley has two connector accessories available to accommodate connections from the din connector of the card to external circuitry. These accessories are summarized in table 2-5. Caution do not use the model 7011-mtc-2 cable w...

  • Page 23

    Card connections and installation 2-7 2.9 typical output connection schemes the following examples show output connections from the i/o card to external circuitry, and summarized the required internal connections on the card. For details on the internal connections, see “internal connections” at the...

  • Page 24

    Card connections and installation 2-8 motor control — figure 2-11 shows a digital output connec- tion scheme to control small 12v dc motors. An external 12v voltage source is used to provide the necessary voltage level. This example assumes that the pull-up resistors for channels 17 and 18 (r182) ar...

  • Page 25

    Card connections and installation 2-9 the logic device is a demultiplexer (dmux). The binary pattern (value) seen at the input of the dmux (lines a, b and c) determines which dmux output line (y0 through y7) is selected (pulled low). For example, with channels 25, 26 and 27 off (open), lines a, b an...

  • Page 26

    Card connections and installation 2-10 input/output connections warning connection and installation procedures are to be performed by qualified service personnel. Failure to recognize and ob- serve standard safety precautions could result in personal injury or death. Connections to external circuitr...

  • Page 27: Operation

    3 operation 3-1 3.1 introduction the information in this section is organized as follows: • power limits — covers the maximum power limits of the model 7020 digital i/o interface card. • channel status display — summarizes how the main- frame display is used to provide status of input and out- put c...

  • Page 28

    Operation 3-2 the right portion is for slot 2 (card 2). For the model 7002, channel status led grids are used for the 10 slots. The led grid for slot 1 is shown in figure 3-2. Input/output channel organization of the channel status display for each slot is shown in figure 3-3. The card contains 40 i...

  • Page 29

    Operation 3-3 3.5 controlling output channels output channels are displayed and controlled from the nor- mal display state of the model 7001 or 7002. If currently in a menu structure, use the exit key to return to the normal display state. 3.6 turning output channels on and off an output channel is ...

  • Page 30

    Operation 3-4 3.7 scanning output channels output channels are scanned by creating a scan list and con- figuring the model 7001/7002 to perform a scan. The scan list is created in the same manner as a channel list (see turn- ing output channels on and off). However, the scan list is specified from t...

  • Page 31

    Operation 3-5 either of the following statements turns off channels 1!1, 1!4 through 1!6, and the channels of m1: print #1, "output 07; open (@ 1!1, 1!4:1!6, m1)" print #1, "output 07; open all" 3.11 scanning output channels there are many commands associated with scanning. How- ever, it is possible...

  • Page 32

    Operation 3-6 print #1, "output 07; sens2:data? (@1:40)" print #1, "enter 07" line input #2, a$ print a$ the response message will include a “0” (off) or “1” (on) for each of the 40 input channels (i.E. “0, 0, 0, 1, 0..... 0, 1”)..

  • Page 33: Service Information

    4 service information 4-1 warning the information in this section is in- tended only for qualified service person- nel. Some of the procedures may expose you to hazardous voltages that could re- sult in personal injury or death. Do not attempt to perform these procedures unless you are qualified to ...

  • Page 34

    Service information 4-2 3. Place the mainframe in the “read input channels” dis- play mode by selecting the read-i/o-card option of the card cofiguration menu. Verify on the dis- play that the input channel is off (open). 4. On the mainframe, press open all to turn off (open) the output channel and ...

  • Page 35

    Service information 4-3 1. The id data line (pin 5 of u107) is set from high to low while the id clk line (pin 6 of u107) is held high. This action initiates a start command to the rom to transmit data serially to the mainframe (figure 4-3). 2. The mainframe sends the rom address location to be read...

  • Page 36

    Service information 4-4 4.9 input channel control the mainframe reads digital input channels of the i/o card from a serial, fi e-byte (40-bits) data stream (via indata line). Digital inputs are applied in a parallel fashion to the fi e in- put channel registers (8 channels per register). When the di...

  • Page 37

    Service information 4-5 table 4-2 troubleshooting procedure step item/component required condition comments 1 2 3 4 5 6 7 8 gnd pad +5v pad u107, pin 6 u107, pin 5 u113, pin 7 and u104, pin 1 u113 and u104, pin 2 u113, pin 3 and u104, pin 9 u109-u113, pins 11-18 +5.3vdc id clk pulses id data pulses ...

  • Page 38

    Service information 4-6.

  • Page 39: Replaceable Parts

    5 replaceable parts 5-1 5.1 introduction this section contains replacement parts information, sche- matic diagrams and component layout drawings for the model 7020. 5.2 parts lists parts lists for the various circuit boards are included in ta- bles integrated with the schematic diagrams and componen...

  • Page 40

    Replaceable parts 5-2 table 5-1 model 7020 mass terminal board, parts list circuit desig. Description keithley part number c401-404 j1004 p1002,1003 r401-440 rt401-440 bracket silkscreening connector shim shield cap., 1uf,20%,50v,ceramic conn, 96-pin, 3 rows connector, 48-pin, 3 rows res,10,5%,1/2w,...

  • Page 41

    Note: for component information, see product structure. 3/6/95 1:1 c a b 7 0 2 0 - 1 7 0 component layout, a b preliminary 70 20 -1 70 rt440 rt439 rt438 rt437 rt436 rt435 rt434 rt433 rt432 rt431 rt430 rt429 rt428 rt427 rt426 rt425 rt424 rt423 rt422 rt421 rt420 rt419 rt418 rt417 rt416 rt415 rt414 rt4...

  • Page 48: Index

    I-1 b block diagram 4-2 c card connections and installation 2-1 card installation 2-3 card removal 2-4 channel assignments 3-2 channel functionality test 4-1 channel status display 3-1 component layouts and schematic diagrams 5-1 controlling devices using pull-up resistors 1-1 controlling output cha...

  • Page 49

    I-2.

  • Page 50: Service Form

    Service form model no. Serial no. Date name and telephone no. Company list all control settings, describe problem and check boxes that apply to problem. ❏ intermittent ❏ analog output follows display ❏ particular range or function bad; specify ❏ ieee failure ❏ obvious problem on power-up ❏ batteries...

  • Page 53

    Specifications are subject to change without notice. All keithley trademarks and trade names are the property of keithley instruments, inc. All other trademarks and trade names are the property of their respective companies. Keithley instruments, inc. 28775 aurora road • cleveland, ohio 44139 • 440-...