ADLINK Technology PXI-7901 User manual

PXI-7901
16-ch General-Purpose SPDT
Relay Module
User’s Manual
Manual Rev.: Rev. 1.1
Date: February 7, 2020
Part Number: 50-17010-1010

Copyright © 2004, 2020 ADLINK
Technology Inc. All Rights Reserved.
Revision History.
1.00
28-06-2004
Initial release
1.1
07-02-2020
Remove Star Trigger Out functionality
Disclaimer
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
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trademarks of their respective companies.

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Table of Contents • i
Table of Contents
How to Use This Manual..............................................................ii
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-7901 Topology................................................................9
3.2 PXI-7901 Pin assignment & Description............................9
3.3 TB-6201 Terminal Board..................................................10
Chapter 4 Operation Theorem................................................11
4.1 Hardware Block Diagram.................................................11
4.2 Operation Mode...............................................................12
4.3 Handshaking....................................................................12
4.4 Trigger Bus. .....................................................................16
4.5 Auxiliary Digital I/O...........................................................18
4.6 Hot-Swap.........................................................................19
4.7 Emergency Shutdown......................................................19
4.8 Watchdog Timer...............................................................20
Warranty Policy........................................................................23

ii • How to use this Manual
How to Use This Manual
This User Manual is designed to assist users in the installation of the ADLINK
PXI-7901, 16-ch General Purpose SPDT 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.

Introduction • 1
Introduction
ADLINK PXI-7901 is a general-purpose (GP) switch module implementing 16-
CH independent single-pole double-throw (SPDT) relays (1 Form C). PXI-7901
can connect one input to one output, and be used as signal switching or routing
for measurement systems as well as ATE.
Relays of PXI-7901 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-7901 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 2.0R3.0)
•PICMG 2.1 R2.0 CompactPCI Hot-Swap specificationscompliant
•16-ch SPDT (1 Form C) non-latching relays
•Contact rating
•3A switching, 3Acarrying
•220VDC, 250VAC
•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
•Eight auxiliary 3.3 V/TTL digital inputs/outputs with 5Vtolerance
•Supports PXI backplane triggers to synchronize multiple modules
•Fully software programmable
1

2 • Introduction
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/Aperipherals to
implement a data acquisition and control system
1.3 Specifications
Relay Output
•Number of channels: 16
•Relay type: SPDT (1 Form C), non-latching
•Switching capacity:
•Max. switching current: 3A
•Max. switching voltage: 220VDC, 250VAC
•Max. switching power: 50VA, 60W
♦Max. carrying current: 3A
•Failure rate: 10µA
•Contact resistance: 150mΩ max.
•Relay set/reset time
•Operate time: 5msmax.
•Release time: 5msmax.
•Bounce time: 3ms max.
•Expected life:
•Mechanical life: 108operations min.
•Electrical life: 106operations min. (0.4A @ 12VAC, resistive load)
•Data transfer: Programmed I/O
Auxiliary Digital I/O
•Numbers of channel: 8inputs/outputs
•Compatibility: 3.3 V/TTL (5Vtolerant)
•Data transfers: programmed I/O
Handshaking Signals
•Programmable polarity
•Logic level: 3.3 V/TTL (5V tolerant)
•Trigger In source: AUX1, PXI trigger bus, PXI star trigger in
•Scanner Advanced destination: AUX0, PXI trigger bus

Introduction • 3
Safety Functions
•Emergency shutdown
•Logic level: 3.3 V/TTL (5V tolerant)
•Active with logic low (for AUX2/SHDNn pin)
•Emergency shutdown sources: AUX2/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-bitwatchdog
timer, PXI star trigger input, PXI trigger bus
General Specifications
•I/O Connector: 62-pin D-submale
•Operating temperature: 0 to55°C
•Storage temperature: -20 to70°C
•Humidity: 5 to 95% non-condensing
•Power requirements (when all relays are activated simultaneously)
+5V +3.3V
700mA 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.

4 • Introduction
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Installation • 5
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-7901, 16-ch General Purpose SPDT 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-staticmat.
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 anti-
static 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.
2

6 • Installation
Note: Do not apply power to the module if it has been damaged.
You are now ready to install the PXI-7901.
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
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.

Installation • 7
Figure 2: Installing the switch module into a PXI platform

8 • Installation
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Signal Connection • 9
Signal Connection
3.1 PXI-7901 Topology
The PXI-7901 has 16 independent SPDT Relays onboard. Each relay has three
terminals, NC (normally closed), NO (normally opened), and COM (common).
When a relay is in its reset (de-energized) state, the NC connects to COM;
while in set (energized) state, the NO connects to COM. Thus all signal paths
on PXI-7901 are inherently break-before-make.
After power-up, all relays are in their reset (de-energized) state; i.e. NC
connects to COM.
3.2 PXI-7901 Pin assignment & Description
22. COM0
43. NO0
23. COM1
1. NC0
44. NO1
24. COM2
2. NC1
45. NO2
25. COM3
3. NC2
46. NO3
26. COM4
4. NC3
47. NO4
27. COM5
5. NC4
48. NO5
28. COM6
6. NC5
49. NO6
29. COM7
7. NC6
50. NO7
30. COM8
8. NC7
51. NO8
31. COM9
9. NC8
52. NO9
32. COM10
10. NC9
53. NO10
33. COM11
11. NC10
54. NO11
34. COM12
12. NC11
55. NO12
35. COM13
13. NC12
56. NO13
36. COM14
14. NC13
57. NO14
37. COM15
15. NC14
58. NO15
38. NC
16. NC15
59. NC
39. NC
17. NC
60. AUX3
40. AUX4
18. AUX2/SHDNn
61. AUX6
41. +5V out
19. AUX5
62. AUX7
42. AUX1/TRG_IN
20. GND
21. AUX0/S_ADV
Table 1: Pin Assignment
3

10 • Signal Connection
Signal Name
Type
Description
NO[15..0]
Input/Output
Normally opened terminal of relays
NC[15..0]
Input/Output
Normally closed terminal of relays
COM[15..0]
Input/Output
Common terminal of relays
AUX[7..0] Input/Output
Programmable Digital I/O with tri-state
control.
AUX[2..0] are dual function pins used for
triggering, refer to chapter 4 for details.
TRG_IN
Input
Trigger input for handshaking operation
S_ADV Output
Scanner Advanced trigger output for
handshaking operation
SHDNn
Input
Active-low Emergency Shutdown trigger
+5V out Output
Unregulated +5V DC Source, maximum
100mA current loading
GND
Output
Ground
NC
Not Connected
Unused pin
Table 2: Pin Description
3.3 TB-6201 Terminal Board
The TB-6201 is a screw terminal board with D-sub 62-pin female connector.
The terminal board can attach to PXI-7901 directly, or through ADLINK custom-
made high-capacity 62-pin D-sub cable.
The pin description is described in Table 2.

Operation Theorem • 11
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.
Figure 3: Hardware Block Diagram
4
Scan Memory
Relay PXI
Interface
PXI Trigger Bus
Star Trigger In
PXI Connector
Front Connector
Relay
Control
Timing
Control
Signal
Routing
Matrix
Trigger
Control
DIO
Scan-
Advance
Trigger-in

12 • Operation Theorem
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 8ms on PXI-7901.
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-edgeactive.
For more information on scanlist configuration, please refer to the software
programming users’ guide.

Operation Theorem • 13
Figure 4 illustrates the available signal sources for the Trigger In signal. Signal
names in the solid-line box represent the external (physical) signal on
connectors, and signals in the dotted-line box represents switch module’s
internal signal.
Figure 4: Available signal sources for 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 5 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.
Figure 5: Available signal destinations for Scanner Advanced
Trigger In Signal
Software Trigger
TRG_IN
Trigger Bus
AUX[7…0]
Star Trigger In
Scanner Adv.
Signal
S_ADV
Trigger Bus [7…0]
AUX [7...0]

14 • Operation Theorem
#0
#0
TS
A1
T
TS
A1
T
TS
TA2
Handshaking protocol
Figures 6 and 7 depict the relationship between Trigger In, Scanner Advanced,
and relay pattern in handshaking mode. In Figure 7 the Scanner Advanced is
set to pulsating mode.
Trigger In
Scanner Advanced
Relay Status PPattern #3 #4
Operation Start
Figure 6: Handshaking operation (Scanner Advanced set in pulsating mode)
Trigger In
Scanner Advanced
Relay Status PPattern #3 #4
Operation Start
Figure 7: Handshaking operation (Scanner Advanced set in toggling mode)
attern
Pattern #2
#1
TS
TA
Pattern #2 #1 attern
TS
TA
3
TA2
TS