ADLINK PXI-7921 User Manual

24-CH, Multiplexer DPDT Relay Module

PXI-7921

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.

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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

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

• 24-CH DPDT (2 Form C) non-latching relays

• Contact rating

• 2A switching, 2A carrying

• 220V

• 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

, 125VAC

DC

specifications compliant

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: 220V

• 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: 10

• Electrical life: 5x10

• Data transfer: Programmed I/O

8

operations min.

5

operations min. (1A @ 30VAC, resistive load)

, 125VAC

DC

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