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ADLINK Technology NuPRO-935A User`s manual
PXI-7921
24-CH, Multiplexer DPDT Relay Module
User’s Manual
Recycled Paper
© Copyright 2004 ADLINK Technology Inc.
All Rights Reserved.
Manual Rev. 1.00: July 9, 2004
Part Number: 50-17011-100
The information in this document is subject to change without prior notice in
order to improve reliability, design, and function and does not represent a
commitment on the part of the manufacturer.
In no event will the manufacturer be liable for direct, indirect, special,
incidental, or consequential damages arising out of the use or inability to use
the product or documentation, even if advised of the possibility of such
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This document contains proprietary information protected by copyright. All
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NuDAQ®, NuIPC®, NuDAM®, NuPRO® are registered trademarks of ADLINK
Technology Inc. Other product names mentioned herein are used for
identification purposes only and may be trademarks and/or registered
trademarks of their respective companies.
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Table of Contents
Chapter 1 Introduction............................................................... 1
1.1 Features............................................................................... 1
1.2 Applications ........................................................................ 2
1.3 Specifications...................................................................... 2
1.4 Software Support ................................................................ 3
Chapter 2 Installation................................................................. 5
2.1 Contents .............................................................................. 5
2.2 Unpacking........................................................................... 5
2.3 Mechanical Drawing........................................................... 6
2.4 Installing the switch module into a PXI Platform............... 6
Chapter 3 Signal Connection ..................................................... 9
3.1 PXI-7921 Topology ............................................................ 9
3.2 PXI-7921 Pin Assignments & Descriptions...................... 10
3.3 TB-6221 Terminal Board .................................................. 13
2-wire MUX........................................................................ 14
2-wire, 2-group MUX ......................................................... 15
2-wire, 4-group MUX ......................................................... 16
1-wire MUX........................................................................ 17
4-wire MUX........................................................................ 18
Chapter 4 Operation Theorem ................................................ 19
4.1 Hardware Block Diagram ................................................. 19
4.2 Operation Mode ................................................................ 20
4.3 Handshaking ..................................................................... 20
4.4 Trigger Bus ....................................................................... 24
4.5 Star Trigger ....................................................................... 25
4.6 Auxiliary Digital I/O......................................................... 26
4.7 Hot-Swap .......................................................................... 27
4.8 Emergency Shutdown ....................................................... 27
4.9 Watchdog Timer................................................................ 28
Warranty Policy ........................................................................ 31
Table of Contents • i
How to Use This Manual
This User Manual is designed to assist users in the installation of the ADLINK
PXI-7921, 24-CH Multiplexer DPDT Relay PXI Switch module.
Chapter 1
Introduction
Gives an outline and overview of ADLINK switch modules’
features, specifications, and applications.
Chapter 2
Installation
Describes how to install a switch module into a PXI chassis. For
software library and utilities installation, please refer to the
Software Users’ Guide.
Chapter 3
Signal Connection
Shows the pin assignments and terminal board connection of the
switch module.
Chapter 4
Operation Theorem
Describes function blocks on ADLINK switch modules and
operation instructions.
ii • How to use this Manual
1
Introduction
ADLINK PXI-7921 is a relay multiplexer module which consists of 24 2-wire
relays (DPDT, 2 Form C). PXI-7921 provides 48x1 1-wire and 24x1 2-wire and
12x1 4-wire configurations and typically connects one instrument, such as a
DMM, a digitizer or a signal source, with many points which need measurement
or excitation.
Relays of PXI-7921 can be updated by either direct-update mode or auto-scan
mode. The latter mode supports scanlist of 1k-sample for deterministic
scanning.
PXI trigger functions are fully supported and software programmable. The
multiple switch modules can be synchronized and triggered without additional
field wiring.
For safety critical applications, PXI-7921 module can switch to the preset state
by either asserting emergency shutdown manually, or watchdog timer overflow
event.
1.1 Features
•
•
•
•
•
•
•
•
•
•
•
•
PXI specifications Rev. 2.0 compliant
3U Eurocard form factor, CompactPCI compliant (PICMG 2.0 R3.0)
PICMG 2.1 R2.0 CompactPCI Hot-Swap specifications compliant
24-CH DPDT (2 Form C) non-latching relays
Contact rating
•
2A switching, 2A carrying
•
220VDC, 125VAC
125 operations per second
1k-sample scanlist for deterministic scanning
Provides handshaking signals to trigger external instruments
Programmable emergency shutdown function and Watchdog timer for
safety critical applications
Three auxiliary 3.3V/TTL digital inputs/outputs with 5V tolerance
Supports PXI backplane triggers to synchronize multiple modules
Fully software programmable
Introduction • 1
1.2 Applications
•
•
•
•
•
•
•
Industrial ON/OFF control
External high power relay driving and signal switching
Laboratory automation
Industrial automation
Switch contact status sensing
Limit switch monitoring
Cooperating with other modules such as A/D and D/A peripherals to
implement a data acquisition and control system
1.3 Specifications
Relay Output
•
•
•
•
•
•
•
•
Number of channels: 24
Relay type: DPDT (2 Form C), non-latching
Switching capacity:
•
Max. switching current: 2A
•
Max. switching voltage: 220VDC, 125VAC
•
Max. switching power: 50VA, 60W
♦ Max. carrying current: 2A
Failure rate: 10µA
Contact resistance: 100mΩ max.
Relay set/reset time
•
Operate time: 4ms max.
•
Release time: 4ms max.
•
Bounce time: 1ms max.
Expected life:
•
Mechanical life: 108 operations min.
•
Electrical life: 5x105 operations min. (1A @ 30VAC, resistive load)
Data transfer: Programmed I/O
Auxiliary Digital I/O
•
•
•
Numbers of channel: 3 inputs/outputs
Compatibility: 3.3 V/TTL (5V tolerant)
Data transfers: programmed I/O
Handshaking Signals
•
•
•
•
Programmable polarity
Logic level: 3.3 V/TTL (5V tolerant)
Trigger In source: TRG_IN, PXI trigger bus, PXI star trigger in
Scanner Advanced destination: S_ADV, PXI trigger bus, PXI star
trigger out
2 • Introduction
Safety functions
•
•
Emergency shutdown
•
Logic level: 3.3 V/TTL (5V tolerant)
•
Active with logic low (for AUX2/SHDNn pin)
•
Emergency shutdown sources: SHDNn, PXI star trigger input, PXI
trigger bus
Watchdog timer
•
Base clock available: 10MHz, fixed
•
Counter width: 32-bit
•
Watchdog Timer Overflow sources: Onboard 32-bit watchdog
timer, PXI star trigger input, PXI trigger bus
General Specifications
•
•
•
•
•
•
I/O Connector: 62-pin D-sub male
Operating temperature: 0 to 55°C
Storage temperature: -20 to 70°C
Humidity: 5 to 95% non-condensing
Power requirements (when all relays are activated simultaneously)
+5V
+3.3V
1A
400mA
Dimensions (not including connectors)
•
160 mm x 100 mm
1.4 Software Support
ADLINK's ADL-SWITCH driver package is for Microsoft Windows operating
systems, including Windows 98/ME/NT/2000/XP.
The driver package also provides utilities to test your switch module, as well as
programming samples and source codes in Microsoft Visual Basic and Visual
C/C++.
For other operating systems, please contact ADLINK for more information.
Introduction • 3
2
Installation
This chapter describes the installation process for the ADLINK switch module.
Please read the contents of the package and the disassembling information
carefully as they are important in the implementation of the ADLINK switch
module.
2.1 Contents
The package consists of the following items in addition to the User Manual:
•
•
•
•
PXI-7921, 24-CH Multiplexer DPDT Relay module
This User’s Guide
ADLINK Software CD
ADL-Switch User’s Guide
If any of these items are missing or broken, please do not hesitate to contact
ADLINK or the dealer from whom the product was purchased. Keep the
shipping materials and carton for future storage or shipping.
2.2 Unpacking
ADLINK switch module contains sensitive electronic components that can be
easily damaged by static electricity. The switch module should be operated on a
grounded anti-static mat. It is strongly recommended that the operator wears an
anti-static wristband, grounded at the same point as the anti-static mat.
Inspect the box for any obvious damage. Check the unit to ensure there are no
shipping and handling damages that may have occurred before proceeding.
After opening, remove the system module and place it only on a grounded antistatic surface component side up.
Again, inspect the module for any damage. Press down on all the socketed IC’s
to make sure they are all properly seated. Please do this only on a firm and flat
surface.
Installation • 5
Note: DO NOT APPLY POWER TO THE MODULE IF IT HAS BEEN
DAMAGED.
You are now ready to install the PXI-7921.
2.3 Mechanical Drawing
Figure 1: ADLINK Switch Module
ADLINK switch module is packaged in a Eurocard form factor compliant with
PXI Specifications measuring 160 mm in length and 100 mm in height (not
including connectors). A 62-pin connector is located at the front panel for wiring
purposes and the J1/J2 IEC connectors in the rear are used to link the chassis
backplane. With its modular, rugged, and high shock resistant mechanical
features, the switch module functions exceptionally well in any harsh
environment application.
2.4 Installing the switch module into a PXI Platform
To insert the ADLINK PXI switch module, align the module’s edge with the card
guide in the PXI chassis. Slide the switch module into the chassis, until
resistance is felt from the PXI connector. Push the ejector upwards and fully
6 • Installation
insert the switch module into the chassis. Once inserted, a “click” can be heard
from the ejector latch. Tighten the screws on the front panel.
Figure 2: Installing the switch module into a PXI platform
Installation • 7
3
Signal Connection
3.1 PXI-7921 Topology
The ADLINK PXI-7921 is the armature relay multiplexer module which
consists of a 24×1 2-wire multiplexer. It also can operate as two groups of
12x1 2-wire multiplexer, four groups of 6×1 2-wire multiplexer, one group of
48×1 1-wire multiplexer, or one group of 12×1 4-wire multiplexer. These
configurations are totally software programmable.
The PXI-7921 typically connects one instrument, such as a DMM or digitizer,
to many measurement points or a signal source to several points needing
excitation. Without jumper settings, complete software programming makes
PXI-7921 easy-to-use and dedicated for versatile applications. PXI-7921
fully supports PXI trigger functions. Multiple switch modules can therefore be
synchronized or triggered without additional field-wiring.
Signal Connection • 9
3.2 PXI-7921 Pin Assignments & Descriptions
43.
44.
45.
46.
47.
48.
49.
50.
51.
COM2+
COM2COM3+
COM3CH18+
CH18CH19+
CH19CH20+
10 • Signal Connection
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
+5 VOUT
CH8+
CH8CH9+
CH9CH10+
CH10CH11+
CH11CH12+
1.
2.
3.
4.
5.
6.
7.
8.
9.
CH0+
CH0CH1+
CH1CH2+
CH2CH3+
CH3CH4+
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
CH20CH21+
CH21CH22+
CH22CH23+
CH231WireloRef*
TRG_IN
S_ADV
SHDNn
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
CH12CH13+
CH13CH14+
CH14CH15+
CH15CH16+
CH16CH17+
CH17-
10.
11.
12.
13.
14.
15.
16.
17.
18.
19.
20.
21.
CH4CH5+
CH5COM0+
COM0COM1+
COM1CH6+
CH6CH7+
CH7GND
*not used in two-wire mode
Table 1: Pin Assignment (2 wire)
43.
44.
45.
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
22.
23.
24.
25.
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
COM2+*
COM2-*
COM3+*
COM3-*
CH18
CH42
CH19
CH43
CH20
CH44
CH21
CH45
CH22
CH46
CH23
CH47
1WireloRef
TRG_IN
S_ADV
SHDNn
+5 VOUT
CH8
CH32
CH9
CH33
CH10
CH34
CH11
CH35
CH12
CH36
CH13
CH37
CH14
CH38
CH15
CH39
CH16
CH40
CH17
CH41
1. CH0
2. CH24
3. CH1
4. CH25
5. CH2
6. CH26
7. CH3
8. CH27
9. CH4
10. CH28
11. CH5
12. CH29
13. COM0+
14. COM015. COM1+*
16. COM1-*
17. CH6
18. CH30
19. CH7
20. CH31
21. GND
*not used in one-wire mode
Table 2: Pin Assignment (1 wire)
43. COM2+
44. COM245. COM3+
22.
23.
24.
25.
+5 VOUT
CH8A+
CH8ACH9A+
1. CH0A+
2. CH0A3. CH1A+
Signal Connection • 11
46.
47.
48.
49.
50.
51.
52.
53.
54.
55.
56.
57.
58.
59.
60.
61.
62.
COM3CH6B+
CH6BCH7B+
CH7BCH8B+
CH8BCH9B+
CH9BCH10B+
CH10BCH11B+
CH11B1WireloRef*
TRG_IN
S_ADV
SHDNn
26.
27.
28.
29.
30.
31.
32.
33.
34.
35.
36.
37.
38.
39.
40.
41.
42.
CH9ACH10A+
CH10ACH11A+
CH11ACH0B+
CH0BCH1B+
CH1BCH2B+
CH2BCH3B+
CH3BCH4B+
CH4BCH5B+
CH5B-
4. CH1A5. CH2A+
6. CH2A7. CH3A+
8. CH3A9. CH4A+
10. CH4A11. CH5A+
12. CH5A13. COM0+
14. COM015. COM1+
16. COM117. CH6A+
18. CH6A19. CH7A+
20. CH7A21. GND
*not used in four-wire mode
Table 3: Pin Assignment (4 wire)
Signal Name
Type
COM0± (one wire)
COM<0..3>± (two wire)
COM<0..1>A±(four wire)
COM<0..1>B± (four wire)
CH<0..47> (one wire)
CH<0..23>± (two wire)
CH<0..11>A± (four wire)
CH<0..11>B± (four wire)
1WireLoRef
TRG-IN
Input
S_ADV
Output
SHDNn
Input
+5V OUT
Output
GND
Output
12 • Signal Connection
Description
Input/Output
Common---The common for each bank.
Input/Output
Channels---Where signals are connected
to the switch card. CHχ+ and CHχ- are
switched together.
Input/Output
1 Wire Low Reference---The common
reference signal used in one-wire mode.
Trigger Input---Trigger from an
instrument to advance the switch card to
the next scan entry.
Scanner Advanced---Trigger to an
instrument that indicated the switch card
has advanced to the next scan and relays
are debounced.
Emergency Shutdown---The trigger used
to shutdown the system.
+5V VDC Source---Provide +5 power
pin.
Ground---Provide system ground pin.
COM0± (one wire)
COM<0..3>± (two wire)
COM<0..1>A±(four wire)
COM<0..1>B± (four wire)
CH<0..47> (one wire)
CH<0..23>± (two wire)
CH<0..11>A± (four wire)
CH<0..11>B± (four wire)
Input/Output
Common---The common for each bank.
Input/Output
Channels---Where signals are connected
to the switch card. CHχ+ and CHχ- are
switched together.
Table 4: Pin Description
3.3 TB-6221 Terminal Board
Users can use the TB-6221 terminal board that consists of a printed circuit
with screw terminals. The terminal block connects directly to the front panel
I/O connector of the PXI-7921.
The TB-6221’s default printed circuit is in 2-wire mode. If other configuration
is preferred, user can refer the table on TB-6221 to identify the pin
connected.
Signal Connection • 13
2-wire MUX
This configuration has one 24x1 2-wire multiplexer Bank0, which has twentyfour channels. The following diagram illustrates the terminal board pin
definition.
Figure 3: 24x1 MUX
14 • Signal Connection
2-wire, 2-group MUX
This configuration has two 12x1 2-wire multiplexers Bank0 and Bank1, each
has twelve channels. The following diagram illustrates the terminal board pin
definition.
Figure 4: Two 12x1 MUX
Signal Connection • 15
2-wire, 4-group MUX
This configuration has four 6x1 2-wire multiplexers Bank0, Bank1, Bank2
and Bank3, each has six channels. The following diagram illustrates the
terminal board pin definition.
Figure 5: Four 6x1 MUX
16 • Signal Connection
1-wire MUX
This configuration has one 48x1 1-wire multiplexer Bank0, which has fortyeight channels. The following diagram illustrates the terminal board pin
definition.
Figure 6: 48x1 MUX
Signal Connection • 17
4-wire MUX
This configuration has one 12x1 4-wire multiplexer Bank0, which has twelve
channels. The following diagram illustrates the terminal board pin definition.
Figure 6: 4-wire MUX
18 • Signal Connection
4
Operation Theorem
4.1 Hardware Block Diagram
The ADLINK PXI Switch Module features an onboard FPGA for relay switching
control, trigger control, scanlist storage and sequencing. The PXI triggering and
synchronization functions, such as Star Trigger and Trigger Bus are also
supported. In addition to the Trigger In and Scanner Advanced signals for
external instruments handshaking, the switch module provides eight channels
of programmable digital I/O interface to facilitate general purpose control
applications.
To make full use of the flexible trigger and signaling system on the PXI platform,
the switch module has a built-in signal routing matrix that can exchange signals
between front panel digital I/O, Star Trigger, and Trigger Bus.
Relay
Control
Relay
PXI
Interface
Timing
Control
DIO
ScanAdvance
Trigger-in
Signal
Routing
Matrix
Trigger
Control
Star Trigger In
PXI Connector
Front Connector
Scan Memory
Star Trigger Out
PXI Trigger Bus
Figure 7: Hardware Block Diagram
Operation Theorem • 19
4.2 Operation Mode
The ADLINK PXI Switch Module provides two relay operation modes to
accommodate different application requirements.
Direct-update
The Switch Module updates the relay pattern immediately upon receiving a
software command. This mode provides a straightforward control over switch
module with minimal hardware intervention. If relay contact bouncing is of a
concern, users would need to insert software delay.
ADLINK recommends the debounce time to be at least 5ms on PXI-7921.
Auto-scan
The ADLINK PXI switch module features onboard memory to store user
specified scanlist of up to 1024-entry. In each scanlist entry, users can specify
relay pattern, pattern advancing delay time and criterion.
The switch module can set status bit or generate local interrupt to inform user’s
program whether the pattern has been debounced and advanced to the next
scanlist entry. Users can also specify one-time or cyclic scanning of scanlist
entries.
This operating mode supports trigger signals for instrument handshaking. For
more information on handshaking signals, please refer to section 4.3.
4.3 Handshaking
In the Auto-scan mode, ADLINK PXI switch module accepts Trigger In and
generates Scanner Advanced signal to synchronize relay switching and
measurements with PXI instruments or external measurement devices.
Trigger In
The Trigger In signal from PXI instruments or external measurement devices
instruct the ADLINK PXI switch module to update the relay pattern according to
the one specified in the scanlist entry.
Users may specify wait-for-trigger instruction in a scanlist entry, to have the
switch module wait for the Trigger In before relay pattern is updated. The
polarity of Trigger In can be set to either rising-edge or falling-edge active.
For more information on scanlist configuration, please refer to the software
programming users’ guide.
Figure 8 illustrates the available signal sources for the Trigger In signal. Signal
names in the solid-line box represent the external (physical) signal on
20 • Operation Theorem
connectors, and signals in the dotted-line box represents switch module’s
internal signal.
Figure 8: Available signal sources for Trigger In
Software Trigger
TRG_IN
Trigger Bus [7…0]
Trigger In Signal
AUX[2…0]
Star Trigger In
Scanner Advanced
After updating the relay pattern, the switch module starts its debounce timer
and waits for the relay contacts to settle. When the debounce time elapses, the
switch module will generate a Scanner Advanced signal to notify the PXI
instruments or external measurement devices that the relay contacts have
settled, and ready to take a new measurement.
The waveform, polarity and pulse width of Scanner Advanced signal can also
be software programmed.
For more information on scanlist configuration, please refer to the software
programming users’ guide.
Figure 9 illustrates the available signal destinations for the Scanner Advanced
signal. Signal names in the solid-line boxes represent the external (physical)
signal on connectors, while signals in the dotted-line boxes represent switch
module’s internal signal.
S_ADV
Trigger Bus [7…0]
Scanner Adv.
Signal
AUX [2...0]
Star Trigger Out
Figure 9: Available signal destinations for Scanner Advanced
Handshaking protocol
Operation Theorem • 21
Figures 10 and 11 depict the relationship between Trigger In, Scanner
Advanced, and relay pattern in handshaking mode. In Figure 11 the Scanner
Advanced is set to pulsating mode.
Trigger In
TS
TS
TS
TA2
TA1
TA
3
Scanner Advanced
Relay status
#0
Pattern #1
Pattern #2
Pattern #3
#4
Operation start
Figure 10: Handshaking operation (Scanner Advanced set in pulsating mode)
Trigger In
TS
TS
TS
TA1
TA2
Pattern #1
Pattern #2
TA
Scanner Advanced
Relay status
#0
Pattern #3
Operation start
Figure 11: Handshaking operation (Scanner Advanced set in toggling mode)
Once the operation starts and has received a Trigger In signal, the switch
module updates the relay pattern to that specified in the first entry of scanlist.
22 • Operation Theorem
#4
TS is the default debounce time for a switch module, i.e. 5ms for PXI-7921. TAn
is the user specified scan delay time in the scanlist entry, indicating the time
between the relay being debounced and the exact moment that a measurement
device takes a new measurement. The actual delay time would be the greater
of the two times, to guarantee that measurement devices take measurements
after the signal path is fully settled, and the relays switch as close as possible to
their maximum operating speed.
As the scan delay time elapses, the switch module generates Scanner
Advanced signal to inform the measurement device to take a new
measurement.
After the measurement completes, the measurement device will generate
another Trigger In signal to have the switch module update the relay pattern to
that specified in the second entry of scanlist.
The handshaking process will continue, until it reaches the end of the scanlist
(if one-time scanning mode is selected), or when a software scan-abort
command is received.
Connecting, Trigger and Synchronize with External DMM
In this example, Agilent® 33401A 6-1/2 Digital Multimeter (DMM) is used to
demonstrate signal connection for handshaking operation.
The DMM provides two terminals on the rear panel for the handshaking
operation process, Trig In and VM Comp. The Trig In connects to the Scanner
Advanced output on switch module, while the VM Comp to Trigger In. If the
terminal board is used, wire Trig In to TRG_IN on terminal board, and the VM
Comp to S_ADV.
Follow the instructions below to ensure the handshake functions properly:
1.
Configure ADLINK PXI switch module’s Trigger In to rising-edge
triggered, Scanner Advanced output in active-low pulsating
mode with pulse width of at least 2us.
2.
Configure the DMM to wait for external Trig In before a
measurement, and generate VM Comp after a measurement.
Arm the DMM to wait for the first trigger.
3.
Setup the scanlist and auto-scan mode. The first entry in the
scanlist should be set disable wait for the Trigger In, but enable
Scanner Advanced output. Succeeding entries should enable
both Trigger In and Scanner Advanced output. Download the
scanlist to the switch module afterward.
Start auto-scan by sending scan start command to the switch
4.
Operation Theorem • 23
module.
ADLINK
PXI Switch module
Scanner Advanced Output
(S_ADV)
External Trigger Input
(Trig In)
Trigger Input
(TRG_IN)
Wiring
Agilent 33401A
6-1/2 DMM
Measurement Complete
(VM Comp)
Figure 12: Signal Connection between Switch Module and Agilent DMM
For more information on scanlist configuration, scan mode setup, start, and
stop functions of the auto-scanning process, please refer to the software
programming users’ guide.
4.4 Trigger Bus
PXI specification defines eight bused-lines across slots in a segment. Users
can route various trigger signal to synchronize multiple PXI instruments, and/or
simplify field wiring across multiple ADLINK Switch Modules.
On ADLINK Switch Modules, the trigger bus driver is disconnected from PXI
trigger bus before users’ configuration.
Figure 13 illustrates the available signal destinations for Trigger Bus[7..0].
Signal names in the solid-line boxes represent the external (physical) signals
on connectors while signals in the dotted-line boxes represent the switch
module’s internal signal.
24 • Operation Theorem
Software Trigger
Trigger In Signal
Scanner Adv. Signal
AUX [3…2]
Trigger Bus[7..0]
Star Trigger In
WDT Overflow
SHDNn
Figure 13: Available signal sources for Trigger Bus[7..0]
4.5 Star Trigger
The PXI specification defined 13 matched trigger lines to connect to the first 13
PXI peripheral slots on a PXI backplane. Users can route various trigger signal
to synchronize multiple PXI instruments and achieve tight timing control.
On ADLINK Switch Modules, the star trigger driver is disconnected from the PXI
backplane before users’ configuration. The maximum skew between each star
trigger line is controlled to within 1ns.
Note the reverse input voltage protection range is -0.5V to +5.5V. When the
local bus is used on peripheral modules, make sure that the voltage level is
compatible with ADLINK Switch Module.
Figure 10 illustrates the available signal destinations for Star Trigger. Signal
names in the solid-line boxes represent the external (physical) signal on
connectors, while signals in the dotted-line boxes represent the switch module’s
internal signal.
Operation Theorem • 25
Software Trigger
Trigger In Signal
Scanner Adv. Signal
Trigger Bus [7…0]
Star Trigger Out
AUX [2…0]
WDT Overflow
SHDNn
Figure 10: Available signal sources for Star Trigger
4.6 Auxiliary Digital I/O
The eight auxiliary digital I/O lines on ADLINK Switch Modules provide
versatility to users’ control applications. Each digital I/O line can be input, output
or tri-stated. When in output mode, users can still read back the actual logiclevel on the I/O line. All digital lines are pulled-up to 5V with 10k ohm input
resistance.
Note that AUX[2..0] are dual function pins, driving these pins while enabling
handshaking or emergency shutdown functions, may falsely trigger the Switch
Module or external instruments.
Tri-state
Control
10KΩ
Bus-Switch
and Protection
Circuit
DO
DI
5VDC
Feedback from output
Figure 11: Auxiliary Digital I/O Function Block
26 • Operation Theorem
AUX Pin
4.7 Hot-Swap
The Switch Module can be hot-swapped during hardware failure in noninterruptible or high-availability systems where system shutdown is not an
option.
PXI-7921 incorporates an onboard hot-swap control mechanism. However the
extent of the hot-swap functionality support depends on the operating system
and the PXI platform.
®
Microsoft Embedded XP supports the native hot-swap function. The operating
system automatically releases system resources when a switch module is
extracted and recognizes the new device.
To remove a switch module, first release the screws on the front panel then
push down the red latch on the ejector. When the blue LED turns on, the Switch
module is ready to be removed by fully pushing down the ejector.
To insert another switch module, align the module’s edge with the card guide in
the PXI chassis. Slide the switch module into the chassis, until there is
resistance from the PXI connector. Push the ejector up and fully insert the
switch module into the chassis, a click should be heard from the ejector latch.
The blue LED on the front panel of the switch module will switch off when it is
ready for operation. Tighten the screws on the front panel.
®
Note: Microsoft Windows 2000 does not natively support hot-swap however,
PXI-7921 can be hot-swapped by manual control via an additional hot-swap
driver. For the hot-swap driver on Windows 2000 and other operating systems
such as Linux, VxWorks, etc., please contact ADLINK for more information.
4.8 Emergency Shutdown
In safety-critical applications, users can enable the emergency shutdown
function on PXI Switch Module, to manually set the relay pattern to preset state.
To access this function, users must first configure the emergency shutdown
function by windows API. Generally the trigger source is on the front panel and
connected to a push button, which pulls the SHDNn pin to logic-low when
activated. When multiple PXI Switch modules are installed in a PXI chassis, the
trigger source can be routed through the PXI Trigger Bus and eliminate field
wiring across multiple devices. Figure 12 illustrates available trigger sources for
emergency shutdown. Signal names in the solid-line boxes represent the
external (physical) signal on connectors and signals in the dotted-line boxes
represent the switch module’s internal signal.
Operation Theorem • 27
AUX2/SHDNn
Trigger Bus
Shutdown Trigger
Star Trigger In
Figure 12: Available trigger sources for emergency shutdown
The default relay pattern for emergency shutdown is All-Off on PXI-7921; users
can change the pattern by Windows API.
Upon receiving the emergency shutdown trigger, the Switch Module enters
shutdown mode, and the relay pattern is switched to the preset state. If the
Switch Module is in Auto-scan mode, the updating process would be stopped
immediately; in Direct Update mode where the switch module will not accept
any further update instructions.
To leave emergency shutdown mode, users must call adlSwitch_Recovery in
Windows API. The relay pattern would stay the same as they would in the
emergency shutdown mode, and the scanlist (if set) being rewound to the first
entry.
Note the auxiliary digital I/O function pin AUX2 shares the SHDNn pin; driving
AUX2 to logic-low while the emergency shutdown function is enabled. It will
falsely trigger the Switch Module to enter shutdown mode.
This function is disabled by default. For more information, please refer to the
software programming users’ guide.
4.9 Watchdog Timer
In safety-critical applications, users can enable the watchdog timer function on
PXI Switch Module to automatically set the relay pattern to preset state, in case
the operating system or PXI controller crashes.
To access this function, users must first configure the watchdog timer overflow
trigger source by windows API. Generally the trigger source would come from
the onboard 32-bit watchdog timer. When multiple ADLINK PXI Switch modules
are installed in a PXI chassis, the trigger source can be routed through the PXI
Trigger Bus and eliminate redundant watchdog timer setting on multiple devices.
Figure 13 illustrates the available trigger sources for watchdog timer overflow.
Signal names in the solid-line boxes represent the external (physical) signal on
connectors and signals in the dotted-line boxes represent the switch module’s
internal signal.
28 • Operation Theorem
Int. WDTimer
Trigger Bus
WDT Overflow
Star Trigger In
Figure 13:.Available trigger sources for watchdog timer overflow
The watchdog timer overflow interval can be programmed through Windows
API. After enabling the watchdog timer, users must periodically reset the timer
by software command. If the timer is not being reset within the specified interval,
the switch module will generate an overflow signal and set the relay pattern to
the one specified by users.
This function is disabled by default. For more information, please refer to the
software programming users’ guide.
Operation Theorem • 29
Warranty Policy
Thank you for choosing ADLINK. To understand your rights and enjoy all the
after-sales services we offer, please read the following carefully:
1. Before using ADLINK’s products please read the user manual and follow
the instructions exactly.
2. When sending in damaged products for repair, please attach an RMA
application form.
3. All ADLINK products come with a two-year guarantee, repaired free of
charge.
•
The warranty period starts from the product’s shipment date from
ADLINK’s factory.
•
Peripherals and third-party products not manufactured by ADLINK
will be covered by the original manufacturers’ warranty.
•
4.
5.
6.
End users requiring maintenance services should contact their local
dealers. Local warranty conditions will depend on local dealers.
This warranty will not cover repair costs due to:
a. Damage caused by not following instructions.
b. Damage caused by carelessness on the users’ part during product
transportation.
c. Damage caused by fire, earthquakes, floods, lightening, pollution,
other acts of God, and/or incorrect usage of voltage transformers.
d. Damage caused by unsuitable storage environments (i.e. high
temperatures, high humidity, or volatile chemicals.
e. Damage caused by leakage of battery fluid.
f. Damage from improper repair by unauthorized technicians.
g. Products with altered and/or damaged serial numbers.
h. Other categories not protected under our guarantees.
Customers are responsible for shipping costs to transport damaged
products to our company or sales office.
To ensure the speed and quality of product repair, please download a
RMA
application
form
from
our
company
website:
http://rma.adlinktech.com/policy. Damaged products with attached RMA
forms receive priority.
For further questions, please contact our FAE staff.
ADLINK: service@adlinktech.com
Warranty Policy • 31
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