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National Instruments VXI-AO-48XDC User Manual Download Page 29

Chapter 4

Hardware Overview

VXI-AO-48XDC User Manual

4-2

©

 National Instruments Corporation

VXIbus Interface Circuitry

An onboard switch setting determines the VXI-AO-48XDC logical 
address. The address decoder, which is part of the interface circuitry, 
monitors the VXIbus address. If the VXIbus address matches the module’s 
selected I/O logical address, the module is enabled and the corresponding 
register on the VXI-AO-48XDC is accessed.

In addition, the VXIbus interface circuitry monitors and transmits the 
VXIbus interface circuitry signals. 

I/O Connector

All I/O is transmitted through two standard, 96-pin header connectors. 
See Chapter 2, 

Configuration and Installation

, and Chapter 3, 

Signal 

Connections

, for additional information.

nvRAM/DAC Control

The VXI-AO-48XDC has one 18-bit DAC that is time-division 
multiplexed to create the 48 voltage and 48 current output channels. Each 
voltage and current channel has a track and hold circuit to maintain the 
channel value between DAC updates.

Data is stored in an nvRAM (nonvolatile RAM). The nvRAM/DAC control 
reads the DAC channel data stored in the nvRAM and updates the DAC 
periodically. The nvRAM/DAC control also controls the analog 
demultiplexing circuits to route the DAC output to the correct analog output 
channel.

You can save nvRAM data, thus allowing power-on values on all analog 
channels.

Digital I/O Control

The VXI-AO-48XDC has 32 digital I/O lines configured as four 8-bit 
ports. You can configure each line independently as an input or output. The 
DIO lines have 12 mA of sink capability and 8 mA of source capability. All 
digital lines are TTL compatible. At power up all digital lines are 
configured as inputs.

Summary of Contents for VXI-AO-48XDC

Page 1: ...DAQ VXI AO 48XDC User Manual DC Setpoint Module for VXIbus VXI AO 48XDC User Manual March 1999 Edition Part Number 321403B 01 ...

Page 2: ...48 14 24 24 Germany 089 741 31 30 Hong Kong 2645 3186 India 91805275406 Israel 03 6120092 Italy 02 413091 Japan 03 5472 2970 Korea 02 596 7456 Mexico D F 5 280 7625 Mexico Monterrey 8 357 7695 Netherlands 0348 433466 Norway 32 27 73 00 Singapore 2265886 Spain Madrid 91 640 0085 Spain Barcelona 93 582 0251 Sweden 08 587 895 00 Switzerland 056 200 51 51 Taiwan 02 2377 1200 United Kingdom 01635 52354...

Page 3: ...imitation of the liability of National Instruments will apply regardless of the form of action whether in contract or tort including negligence Any action against National Instruments must be brought within one year after the cause of action accrues National Instruments shall not be liable for any delay in performance due to causes beyond its reasonable control The warranty provided herein does no...

Page 4: ...1 3 VXIplug play Instrument Driver 1 3 Optional Equipment 1 4 Custom Cabling 1 4 Unpacking 1 5 Chapter 2 Configuration and Installation Module Configuration 2 1 VXIbus Logical Address 2 3 Hardware Installation 2 4 Software Installation 2 5 Chapter 3 Signal Connections I O Connector Pin Assignments 3 1 Signal Connection Descriptions 3 4 Analog Output Signal Connections 3 5 Voltage Output 3 6 Power ...

Page 5: ... 2 Serial Number EPROM 4 3 Temperature Sensor 4 3 Chapter 5 Calibration Self Calibration 5 1 External Calibration 5 1 Voltage Output Calibration 5 2 Offset Adjustment 5 2 Gain Adjustment 5 2 Current Output Calibration 5 3 Offset Adjustment 5 3 Gain Adjustment 5 3 Calibration Programming Considerations 5 4 Appendix A Specifications Appendix B Common Questions Appendix C Technical Support Resources ...

Page 6: ... 2 2 Logical Address Selection 2 4 Figure 3 1 CH 0 23 Connector Pin Assignments 3 2 Figure 3 2 CH 24 47 Connector Pin Assignments 3 3 Figure 3 3 VCH Connection as a Voltage Output 3 5 Figure 3 4 ICH Connection as a Current Output 3 7 Figure 3 5 Digital I O Connections 3 8 Figure 4 1 VXI AO 48XDC Block Diagram 4 1 Tables Table 3 1 CH 0 23 Connector Descriptions 3 4 Table 3 2 CH 24 47 Connector Desc...

Page 7: ...ese documents for hardware installation and configuration instructions specification information about your VXI DAQ hardware and application hints Software documentation You may have both application software and driver software documentation National Instruments application software includes ComponentWorks LabVIEW LabWindows CVI Measure and VirtualBench National Instruments driver software includ...

Page 8: ...ake to avoid being electrically shocked bold Bold text denotes the names of menus menu items or dialog box buttons or options bold italic Bold italic text denotes a note caution or warning italic Italic text denotes emphasis a cross reference or an introduction to a key concept monospace Text in this font denotes text or characters that are to be literally input from the keyboard sections of code ...

Page 9: ...digital I O lines You can use the VXI AO 48XDC in a wide variety of DC setpoint and digital applications With the VXI AO 48XDC your VXIbus system can serve as a digital I O system controller for laboratory testing production testing and industrial process monitoring and control Use your VXI AO 48XDC module to Generate experimental stimuli Generate analog functions Connect to a variety of signal ty...

Page 10: ...ns tools for data acquisition and instrument control built on NI DAQ driver software ComponentWorks provides a higher level programming interface for building virtual instruments through standard OLE controls and DLLs With ComponentWorks you can use all of the configuration tools resource management utilities and interactive control utilities included with NI DAQ LabVIEW features interactive graph...

Page 11: ...tion high speed A D conversion analog output D A conversion waveform generation digital I O counter timer operations SCXI RTSI self calibration messaging and acquiring data to extended memory NI DAQ has both high level DAQ I O functions for maximum ease of use and low level DAQ I O functions for maximum flexibility and performance Examples of high level functions are streaming data to disk or acqu...

Page 12: ...r blocks shielded and unshielded screw terminals For more specific information about these products refer to your National Instruments catalogue or call the office nearest you Custom Cabling National Instruments offers cables and accessories for you to prototype your application or to use if you frequently change module interconnections You can interface the VXI AO 48XDC to a wide range of test in...

Page 13: ...ponents on the module To avoid such damage in handling the module take the following precautions Ground yourself via a grounding strap or by holding a grounded object Touch the antistatic package to a metal part of your VXIbus chassis before removing the module from the package Remove the module from the package and inspect the module for loose components or any other sign of damage Notify Nationa...

Page 14: ...igure and install your VXI AO 48XDC module Module Configuration This section describes how to configure the VXIbus logical address on your VXI AO 48XDC Figure 2 1 shows the VXI AO 48XDC as it appears with the component side facing you The drawing shows the location of various module components including the logical address switch ...

Page 15: ...I AO 48XDC User Manual 2 2 National Instruments Corporation Figure 2 1 VXI AO 48XDC Parts Locator Diagram 1 Serial Number 2 S1 3 Logical Address Switch 4 P1 Connector 5 Product Name 6 Assembly Number 7 Status Light 8 Access Light 5 6 8 7 3 2 1 4 ...

Page 16: ... which indicates that they can be dynamically configured The VXI AO 48XDC supports dynamic configuration of its logical address However adding or removing modules can change the logical address of the VXI AO 48XDC Tracking these changes in your application software can be troublesome In many cases static configuration of the logical address is easier For example ensure that no other statically con...

Page 17: ...l for specific instructions and warnings 1 Plug in your mainframe before installing the VXI AO 48XDC The power cord grounds the mainframe and protects it from electrical damage while you are installing the module Do not turn on the mainframe P1 Connector U51 VXI AO 48XDC Module 1 2 3 4 5 6 7 8 Logical Address Switch Push up for logic 1 Push down for logic 0 a Switch Set to Logical Address Hex 5 De...

Page 18: ...lot d Make sure the front panel of the VXI AO 48XDC is even with the front panel of the mainframe 5 Tighten the retaining screws on the top and bottom edges of the front panel 6 Replace or close any doors or covers to the mainframe Software Installation If you are using a VXIplug play instrument driver follow the instructions in the Setup Utility on the diskettes that were included with your VXI D...

Page 19: ...ximum ratings of input or output signals on the VXI AO 48XDC can damage the VXI AO 48XDC module and the VXIbus system Maximum input ratings for each signal are given in this chapter under the discussion of that signal National Instruments is not liable for any damages resulting from any incorrect signal connections I O Connector Pin Assignments Figures 3 1 and 3 2 show the pin assignments for the ...

Page 20: ... 19 20 21 22 23 24 25 26 27 28 29 30 31 32 A PORT1_LINE6 PORT1_LINE4 PORT1_LINE2 PORT1_LINE0 PORT0_LINE6 PORT0_LINE4 PORT0_LINE2 PORT0_LINE0 ICH 23 ICH 22 ICH 21 ICH 20 ICH 19 ICH 18 ICH 17 ICH 16 ICH 15 ICH 14 ICH 13 ICH 12 ICH 11 ICH 10 ICH 9 ICH 8 ICH 7 ICH 6 ICH 5 ICH 4 ICH 3 ICH 2 ICH 1 ICH 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 B 5 V DGND DGN...

Page 21: ...8 19 20 21 22 23 24 25 26 27 28 29 30 31 32 A PORT3_LINE6 PORT3_LINE4 PORT3_LINE2 PORT3_LINE0 PORT2_LINE6 PORT2_LINE4 PORT2_LINE2 PORT2_LINE0 ICH 47 ICH 46 ICH 45 ICH 44 ICH 43 ICH 42 ICH 41 ICH 40 ICH 39 ICH 38 ICH 37 ICH 36 ICH 35 ICH 34 ICH 33 ICH 32 ICH 31 ICH 30 ICH 29 ICH 28 ICH 27 ICH 26 ICH 25 ICH 24 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 B 5...

Page 22: ...self resetting circuit breaker C 32 9 AGND Analog Ground These pins are connected to the VXI AO 48XDC analog ground plane All VXI AO 48XDC ground planes connect to the VXIbus system ground signal C 8 2 DGND Digital Ground These pins are connected to the VXIbus system ground signal All VXI AO 48XDC ground planes connect to the VXIbus system ground signal Table 3 2 CH 24 47 Connector Descriptions Pi...

Page 23: ...ws how to connect the voltage channel VCH outputs Figure 3 3 VCH Connection as a Voltage Output C 32 9 AGND Analog Ground These pins are connected to the VXI AO 48XDC analog ground plane All VXI AO 48XDC ground planes connect to the VXIbus system ground signal C 8 2 DGND Digital Ground These pins are connected to the VXIbus system ground signal All VXI AO 48XDC ground planes connect to the VXIbus ...

Page 24: ...e to full accuracy within 1 s of power up board reset Current Output You can connect a floating or grounded load to your VXI AO 48XDC module at the current output channel You do not need an external floating power supply to complete the controlled current loop You can control the current loop from 0 1 to 20 2 mA The compliance for the current loop is 0 V to 10 VDC Warning Because the VXI AO 48XDC ...

Page 25: ...ons National Instruments Corporation 3 7 VXI AO 48XDC User Manual Figure 3 4 shows how to connect a current channel ICH as a current output Figure 3 4 ICH Connection as a Current Output AGND ICH VXI AO 48XDC Load 0 1 to 20 2 mA ...

Page 26: ...g TTL signals and sensing external device states such as the switch in Figure 3 5 Digital output applications include sending TTL signals and driving external devices such as the LED shown in Figure 3 5 Note The VXI AO 48XDC allows line by line control of digital I O connections Refer to Appendix A Specifications for a list of the digital I O signal ratings Power up Condition At power up ports 0 t...

Page 27: ...reaker in series If the circuit breaker protection is activated simply remove the circuit causing the heavy current load and the circuit breaker will reset itself For more information on these output pins see the Digital I O and Power Requirement sections in Appendix A Specifications Power rating 1 0 A per pin at 5 V 10 4 55 to 5 25 VDC at 1 A per pin Warning Under no circumstances should you conn...

Page 28: ...ck Diagram The VXIbus I O channel consists of an address bus a data bus interrupt lines and several control and support signals Data Transceivers The data transceivers control the transmission of data to and from the VXIbus VXIbus I O Connector Control Dtack VXI Address VXI Data VXI Interface Logic nvRAM DAC Control Digital I O 18 bit DAC nvSRAM Main Voltage Circuit Main Current Circuit Voltage Ou...

Page 29: ...RAM DAC Control The VXI AO 48XDC has one 18 bit DAC that is time division multiplexed to create the 48 voltage and 48 current output channels Each voltage and current channel has a track and hold circuit to maintain the channel value between DAC updates Data is stored in an nvRAM nonvolatile RAM The nvRAM DAC control reads the DAC channel data stored in the nvRAM and updates the DAC periodically T...

Page 30: ...old the module serial number as well as some other identification information used by the driver software Temperature Sensor The onboard temperature sensor measures the air temperature flowing over the module This sensor is positioned near the onboard precision voltage reference which can be affected by extreme temperatures This sensor has a serial digital interface ...

Page 31: ...in are adjusted to minimize the errors of the four outputs Since the VXI AO 48XDC has excellent channel to channel matching of offset and gain errors minimizing the errors of the four calibration channels also minimizes the errors for all the voltage and current outputs External Calibration Because of the nature of the VXI AO 48XDC calibration circuitry the only calibration adjustment you must mak...

Page 32: ...uld impact the accuracy of the offset calibration Offset Adjustment To calibrate the offset set one of the voltage output channels to 0 V and measure it with a precise voltmeter Then change the voltage offset channel value until the output is zero The voltage you write to the voltage offset channel will be close to zero and increasing it will lower the voltage you measure Gain Adjustment To calibr...

Page 33: ...els to 100 µA and measure it with a precise ammeter Then change the current offset channel value until the output is as close as possible to 100 µA The current you write to the current offset channel will be close to 10 µA and increasing it will lower the current you measure Gain Adjustment To calibrate the gain set the current output channel to a current near full scale such as 20 mA Then change ...

Page 34: ...nnot specify the required precision Use the Set_DAQ_Device_Info function and the associated ND_AO48XDC_SET_POWERUP_STATE parameter to save the new calibration channel values to nonvolatile RAM Refer to the NI DAQ Function Reference Manual for PC Compatibles for more information on using these functions to calibrate your VXI AO 48XDC module To perform the above mentioned calibration with LabVIEW us...

Page 35: ...umber of voltage channels 48 Number of current channels 48 Resolution 18 bit Type of DAC double buffered self calibrating Transfer Characteristics Relative accuracy INL 3 LSB max DNL 2 LSB max Monotonicity 17 bits guaranteed Voltage Output Range 10 1 V Output coupling DC Output impedance 0 1 Ω max Current drive 10 mA max Load capacitance 10 000 pF max Protection Short circuit to ground Absolute ac...

Page 36: ...V Absolute accuracy 7 µA max Noise 1 µA rms DC to 1 MHz Protection Short circuit and open circuit Dynamic Characteristics Settling time including channel latency Stability Offset temperature coefficient voltage 5 µV C current 10 nA C Gain temperature coefficient voltage 1 ppm C current 2 ppm C Digital I O Number of channels 32 I O Compatibility TTL Accuracy 0 1 0 01 0 001 5 ms typ 12 ms max 10 ms ...

Page 37: ...age figures do not include the power used by external devices that are connected to the fused supply present on the I O connector They assume that all voltage and current outputs are fully loaded Physical Dimensions VXI C size single slot I O connector 96 pin DIN x 2 Level Min Max Input low voltage 0 8 V Input high voltage 2 0 V Output low voltage 0 4 V IOL 12 mA Output high voltage 2 4 V IOH 8 mA...

Page 38: ...I AO 48XDC User Manual A 4 National Instruments Corporation Environment Operating Temperature 0 to 55 C ambient Relative humidity 5 to 90 noncondensing Storage Temperature 20 to 70 C ambient Relative humidity 5 to 90 noncondensing ...

Page 39: ...er protection is activated simply remove the circuit causing the heavy current load and the circuit breaker will reset itself For more information on these output pins see the Digital I O and Power Requirement sections in Appendix A Specifications Installation and Configuration What jumpers switches should I be aware of when configuring my VXI AO 48XDC module The only switch you must configure is ...

Page 40: ...on states of the DIO lines on the I O connector At system power on and reset all ports are configured as inputs Refer to the Digital I O Control section in Chapter 4 Hardware Overview for more information Analog Output What are the power on states of the voltage and current outputs At system power on and reset all analog outputs are at the values you last saved How fast does the VXI AO 48XDC modul...

Page 41: ...tions FAQs and their corresponding answers or solutions including special sections devoted to our newest products The database is updated daily in response to new customer experiences and feedback Troubleshooting Wizards Step by step guides lead you through common problems and answer questions about our entire product line Wizards include screen shots that illustrate the steps being described and ...

Page 42: ...h offices maintain a Web site to provide information on local services You can access these Web sites from www natinst com worldwide If you have trouble connecting to our Web site please contact your local National Instruments office or the source from which you purchased your National Instruments product s to obtain support For telephone support in the United States dial 512 795 8248 For telephon...

Page 43: ...iga 109 Symbols approximately degrees negative of or minus Ω ohms per percent plus or minus positive of or plus A A amperes A16 space VXIbus address space equivalent to the VME 64 KB short address space In VXI the upper 16 KB of A16 space is allocated for use by VXI module s configuration registers This 16 KB region is referred to as VXI configuration space ...

Page 44: ...ogramming interface B backplane An assembly typically a printed circuit board with 96 pin connectors and signal paths that bus the connector pins VXIbus systems will have two sets of bused connectors called the J1 and J2 backplanes or have three sets of bused connectors called the J1 J2 and J3 backplane base address A memory address that serves as the starting address for programmable registers Al...

Page 45: ...on process D D A digital to analog DAQ data acquisition 1 Collecting and measuring electrical signals from sensors transducers and test probes or fixtures and inputting them to a computer for processing 2 Collecting and measuring the same kinds of electrical signals with A D and or DIO boards plugged into a computer and possibly generating control signals with D A and or DIO boards in the same com...

Page 46: ...ports You can associate each group with its own clock rates handshaking modes buffer configurations and so on A port cannot belong to more than one group digital trigger A TTL level signal having two discrete levels high and low DIN Deutsche Industrie Norme DIO digital input output DIP dual inline package dithering The addition of Gaussian noise to an analog input signal DLL Dynamic Link Library A...

Page 47: ... CPU controller interface plugged directly into the VXI backplane giving it direct access to the VXIbus It must have all of its required VXI interface capabilities built in EPROM Erasable Programmable Read Only Memory ROM that can be erased usually by ultraviolet light exposure and reprogrammed event Signals or interrupts generated by a device to notify another device of an asynchronous event The ...

Page 48: ...sure in LSB of the worst case deviation from the ideal A D or D A transfer characteristic of the analog I O circuitry input range The difference between the maximum and minimum voltages an analog input channel can measure at a gain of 1 The input range is a scalar value not a pair of numbers By itself the input range does not uniquely determine the upper and lower voltage limits An input range of ...

Page 49: ...s when referring to memory kS 1 000 samples L latched digital I O A type of digital acquisition generation where a device or module accepts or transfers data after a digital pulse has been received Also called handshaked digital I O LED light emitting diode logical address An 8 bit number that uniquely identifies each VXIbus device in a system It defines the A16 register addresses of a device and ...

Page 50: ...of an operating system in which several processes can be run simultaneously N NC Normally closed or not connected NI DAQ National Instruments driver software for DAQ hardware node Execution elements of a block diagram consisting of functions structures and subVIs noise An undesirable electrical signal Noise comes from external sources such as the AC power line motors generators transformers fluore...

Page 51: ... for the analog output voltage to reach its final value within specified limits P PC personal computer port 1 A communications connection on a computer or a remote controller 2 A digital port consisting of four or eight lines of digital input and or output PPI programmable peripheral interface ppm parts per million R RAM random access memory resolution The smallest signal increment that can be det...

Page 52: ...connectors to interface with the board P connectors A slot can have one two or three connectors slot 0 device A VXIbus device that provides basic resources to VXI Slots 1 through 12 For B and C size systems the resources provided are CLK10 and MODID For a D size system the Slot 0 device also provides CLK100 S s Samples per Second Used to express the rate at which a DAQ board samples an analog sign...

Page 53: ...alog output channel in the group update rate The number of output updates per second V V volts VDC volts direct current VI Virtual Instrument 1 A combination of hardware and or software elements typically used with a PC that has the functionality of a classic stand alone instrument 2 A LabVIEW software module VI which consists of a front panel user interface and a block diagram program VISA A new ...

Page 54: ...iple voltage readings taken at a specific sampling rate wire Data path between nodes word serial The simplest required communication protocol used by message based devices in the VXIbus system It uses the A16 communication registers to transfer data with a simple polling handshake method ...

Page 55: ...hannel numbers table 5 2 programming considerations 5 4 self calibration 5 1 voltage output calibration 5 2 to 5 3 gain adjustment 5 2 to 5 3 offset adjustment 5 2 CH 0 23 connector pin assignments figure 3 2 signal descriptions table 3 4 CH 24 47 connector pin assignments figure 3 3 signal descriptions table 3 4 to 3 5 circuit breaker self resetting 3 8 4 1 circuitry VXIbus interface 4 2 common q...

Page 56: ...circuitry 4 2 I ICH connection as current output figure 3 7 ICH 0 23 signal table 3 4 ICH 24 47 signal table 3 4 installation See also configuration common questions B 1 to B 2 hardware installation 2 5 software installation 2 6 unpacking VXI AO 48XDC 1 5 interface VXIbus circuitry 4 2 I O connector digital I O control 4 3 nvRAM DAC control 4 2 pin assignments CH 0 23 connector figure 3 2 CH 24 47...

Page 57: ... I O connector pin description CH 0 23 connector descriptions table 3 2 CH 0 23 connector figure 3 2 CH 24 47 connector descriptions table 3 4 to 3 5 CH 24 47 connector figure 3 3 power connections 3 8 software installation 2 6 software programming choices 1 2 to 1 4 National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 VXIplug play instrument driver 1 4 specificat...

Page 58: ...tion as voltage output figure 3 5 VXI AO 48XDC block diagram 4 1 custom cabling 1 5 features 1 1 optional equipment 1 5 overview 1 1 requirements for getting started 1 2 software programming choices 1 2 to 1 4 National Instruments application software 1 2 to 1 3 NI DAQ driver software 1 3 to 1 4 VXIplug play instrument driver 1 4 unpacking 1 5 VXIbus interface circuitry 4 2 VXIbus logical address ...

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