Pickering PXi 41-720 User manual

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PXI ISOLATED POWER SUPPLY MODULE 41-720
Issue 6.7 July 2018
User Manual
Isolated Power Supply
Module
(Model No. 41-720)
pickeringtest.com pickering

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PXI ISOLATED POWER SUPPLY MODULE 41-720
Page (II) REED RELAY MODULE 40-110/115/120/125
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© COPYRIGHT (2018) PICKERING INTERFACES. ALL RIGHTS RESERVED.
No part of this publication may be reproduced, transmitted, transcribed, translated or stored in any form, or by
any means without the written permission of Pickering Interfaces.
Technical details contained within this publication are subject to change without notice.
ISO 9001
Reg No. FM38792

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PXI ISOLATED POWER SUPPLY MODULE 41-720
Page (III)
REED RELAY MODULE 40-110/115/120/125
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TECHNICAL SUPPORT
For Technical Support please contact Pickering Interfaces either by phone, the website or via e-mail.
WARRANTY
All products manufactured by Pickering Interfaces are warranted against defective materials and workmanship for a period of
three years, excluding programmable power supplies, from the date of delivery to the original purchaser. Any product found to be
defective within this period will, at the discretion of Pickering Interfaces be repaired or replaced.
Products serviced and repaired outside of the warranty period are warranted for ninety days.
Extended warranty and service are available. Please contact Pickering Interfaces by phone, the website or via e-mail.
ENVIRONMENTAL POLICY
Pickering Interfaces operates under an environmental management system similar to ISO 14001.
Pickering Interfaces strives to full all relevant environmental laws and regulations and reduce wastes and releases to the
environment. Pickering Interfaces aims to design and operate products in a way that protects the environment and the health and
safety of its employees, customers and the public. Pickering Interfaces endeavours to develop and manufacture products that can
be produced, distributed, used and recycled, or disposed of, in a safe and environmentally friendly manner.
Worldwide Technical Support and Product Information
pickeringtest.com
Germany
Tel: [phone]
E-mail: [email protected]
Sweden
Tel: [phone]
E-mail: [email protected]
USA
Tel: (West) [phone]
Tel: (East) [phone]
E-mail: [email protected]
Czech Republic
Tel: [phone]
E-mail: [email protected]
France
Tel [phone]
E-mail [email protected]
Pickering Interfaces Headquarters
Stephenson Road Clacton-on-Sea CO15 4NL United Kingdom
Tel: [phone]
E-Mail: [email protected]
China
Tel: [phone]
E-mail: [email protected]

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Page (IV) REED RELAY MODULE 40-110/115/120/125
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MEANING / DESCRIPTION SYMBOL
PROTECTIVE EARTH (GROUND)
To identify any terminal which is intended for connection to an external conductor for
protection against electric shock in case of a fault, or the terminal of a protective earth
(ground) electrode.
DANGEROUS VOLTAGE
To indicate hazards arising from dangerous voltages.
WARNING / CAUTION
An appropriate safety instruction should be followed or caution to a potential hazard
exists.
Refer to the relevant instructions detailed within the product manual.
HEAVY
If this product is heavy reference should be made to the safety instructions for
provisions of lifting and moving.
STATIC SENSITIVE
To indicate that static sensitive devices are present and handling precautions should
be followed.
!
kg
SAFETY SYMBOLS
PRODUCT SAFETY
The following safety symbols may be used on the product and throughout the product documentation.

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PXI ISOLATED POWER SUPPLY MODULE 41-720
Copyright Statement ...................................................................ii
Technical Support and Warranty................................................iii
Product Safety .............................................................................iv
Contents (this page)....................................................................v
Warnings and Cautions ..............................................................vii
Section 2
Technical Description ........................................................ 2.1
Functional Description................................................. 2.1
Maximum Frequency of Operations at Full Load ...............2.1
Section 3
Installation........................................................................... 3.1
Hardware Installation ................................................... 3.1
Software Installation .................................................... 3.2
Soft Front Panel Installation........................................ 3.2
Section 4
Programming Guide........................................................... 4.1
Programming Options For Pickering PXI Cards........ 4.1
41-720 Module Architecture......................................... 4.2
Programming The 41-720 Module............................... 4.3
Using Pickering Drivers in LabVIEW .......................... 4.4
Using The Soft Front Panel ......................................... 4.5
Section 5
Connector Information....................................................... 5.1
Section 6
Trouble Shooting ................................................................ 6.1
Section 7
Maintenance Information................................................... 7.1
Software Update ........................................................... 7.1
Hardware Maintenance ................................................ 7.1
CONTENTS

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WARNINGS AND CAUTIONS
WARNING - HAZARDOUS ENVIRONMENTS SYMBOL
This product is not specically designed for use in hazardous environments, for example in explosive
atmospheres. If the product is to be used in hazardous environments we recommend that the user
ensures suitable protective measures are taken.
!
WARNING - DANGER OF ELECTRIC SHOCK SYMBOL
This module may contain hazardous voltages. Before removing the module from the rack remove all
supplies and disconnect user I/O signals.
Unused slots in the PXI/LXI chassis are populated with blanking plates to prevent access to user
I/O signals that may be present. Blanking panels are available to order from Pickering in a variety
of slot widths. If the product is not used in this manner for example by using an extender card then
additional care must be taken to avoid contact with exposed signals.
CAUTION - HANDLING OF ELECTROSTATIC-SENSITIVE DEVICES SYMBOL
Certain semiconductor devices used in this equipment are liable to damage due to static voltage.
Observe the following precautions when handling these devices in their unterminated state, or
sub-assemblies containing these devices:
1. Persons removing sub-assemblies from equipment using these devices must be earthed by a
wrist strap and a resistor at the point provided on the equipment.
2. Soldering irons used during the repair operations must be low voltage types with earthed tips and
isolated from the mains voltage by a double insulated transformer.
3. Outer clothing worn must be unable to generate static charges.
4. Printed Circuit Boards (PCBs) tted with these devices must be stored and transported in
anti-static bags.
CAUTION - PRODUCT DOCUMENTATION SYMBOL
Suitably qualied & trained users should ensure that the accompanying documentation is fully read
and understood before attempting to install or operate the product.
!
SAFETY INSTRUCTIONS
SAFETY INSTRUCTIONS
All cleaning and servicing requires the equipment to be isolated and disconnected from the power source and user I/O
signals (refer to the Maintenance Section).
• Appropriate manual handling procedures should be followed as dictated by the weight of the individual module or
the combined weight of the modules & chassis.
• Should a fault occur with the module or chassis, immediately isolate and disconnect the incoming power to the
chassis and the user I/O signals.
• Ensure the equipment is installed, operated and maintained by trained and authorised personnel.
• For suitably equipped products in the event of an emergency press the red “emergency stop” button situated on
the front of the unit.

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SECTION 1 - TECHNICAL SPECIFICATION
Page 1.1
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PXI ISOLATED POWER SUPPLY MODULE 41-720
SECTION 1 - TECHNICAL SPECIFICATION
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The 41-720 Isolated Power Supply module provides
fixed output voltage power supplies suitable for
powering devices under test that have a medium power
consumption. The module is ideal for providing fixed
voltages to the device under test and can significantly
reduce the space needed by the test system by
eliminating the bench power supply from the system.
The output voltages are fully isolated from the chassis
and can be used as floating outputs referenced to a DC
pedestal voltage.
The module can be supplied with a variety of voltage
options, each module having up to one isolated bipolar
output and two isolated single output voltages.
The bipolar output provides two output voltages, one
positive and one negative, referenced to a common
output terminal. The outputs can be used in series for
higher voltage applications. All single output voltages
can be used to provide a positive or a negative output
by simply using either the negative or the positive
output as the reference.
The voltage regulators use a switch mode pulse width
modulated regulator that can operate at up to 80%
efficiency
to preserve
the available
power from the
chassis.
CONTROL
CONTROL
CONTROL
PXI
INTERFACE
ISOLATED
BIPOLAR
POWER SUPPLY
ISOLATED
POWER SUPPLY
ISOLATED
POWER SUPPLY
V+
V-
COMMON
V+
COMMON
V+
COMMON
+5V PXI SUPPLY
41-720
Isolated Power Supply
●One Slot Module Provides up to 4 Regulated Output
Voltages
●Short Circuit and Thermally Protected
●Power On/Off Control for Each Regulated Output
●Output Voltages of 5V and 12V Available
●Bipolar Output can be Used to Provide 24V
●Output Isolated From The PXI Power Supply
●Fully Floating Operation
●Available With D-Type Plug or 1mm Sockets
●VISA Drivers Supplied for Windows
Plus Soft Front Panel
●2 Year Warranty
41-720 Soft Front Panel
41-720 Schematic Overview
ISSUE 7.0 OCT 2017

Page 1.2
SECTION 1 - TECHNICAL SPECIFICATION
PXI ISOLATED POWER SUPPLY MODULE 41-720
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Width and Dimensions
Occupies 1 slot of a 3U PXI chassis
Connectors
Power supply outputs are carried either on a 9-pin male
D-type connector or 1mm sockets, the allocation of pins to
supply rails is determined by the order number. The connector
type is specified by the part number suffix.
PXI bus via 32 bit P1/J1 backplane connector.
Electrical Specification
Each module is fitted with up to one bipolar output and two
single output power supplies.
Isolation Voltage
The outputs are fully isolated, maximum common mode
output voltage of 500 Volts
Power Supply Control
Each regulator can be independently turned on or off.
Bipolar Output
One fitted to each module, defined by xx option
Product Order Codes
For each module select one bipolar output option and two
single output voltages. Order code is constructed as:
41-720-XX-YY-ZZ-D for 9-pin D-type output connector
41-720-XX-YY-ZZ-B for 1mm socket output connectors
where XX is the option number of the bipolar output
where YY is the option number for the first single output
and ZZ is the option number of the second single output
Allowed XX options:
Option 00 Not fitted
Option 02 ±12 Volts
Allowed YY and ZZ options:
Option 00 Not fitted
Option 11 5 Volts
Option 12 12 Volts
Pricing for this part is based on how many of the optional
supplies are fitted. If only two are fitted the price is as the
“partial loaded” version, if all three are supplied it is as the
“fully loaded” part.
Mating Connectors & Cabling
For connection accessories for the 41-720 module please
refer to the 90-003D 9-pin D-type Connector Accessories
data sheet where a complete list and documentation can be
found for accessories.
Version Option
02
Output voltage
(referenced to common) ±12V
Maximum Output Current
(each output) 0.625A
Ripple Voltage (peak
to peak) at maximum
current (typical, no added
capacitive load)
130mV
Load Regulation
(at 10% minimum load) 1%
Version Option
11
Option
12
Output voltage
(referenced to common) 5V 12V
Maximum Output Current
(each output) 1.6A 0.665A
Ripple voltage (peak to peak) at
maximum current (typical, no
added load capacitor)
50mV 130mV
Load Regulation
(at 10% minimum load) 0.5%
Power Consumption
No current is taken from the PXI +3.3V supply or the ±12 Volt
supplies.
Current required from +5V PXI supply:
All regulators off: 100 mA
Additional current (each) at full load
Option 02 3.75 Amps
Option 11 & 12 2.1 Amps
Module current consumption should be limited to 6 Amps
for chassis meeting only the minimum requirements of PXI
specification version 2.1.
Single Outputs
Any two options fitted to each module, including two of the
same, defined by yy and zz options.

SECTION 2 - TECHNICAL DESCRIPTION
Page 2.3
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PXI ISOLATED POWER SUPPLY MODULE 41-720
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Programming
Pickering provide kernel, IVI and VISA (NI & Keysight) drivers
which are compatible with all Microsoft supported versions of
Windows and popular older versions. For a list of all supporting
operating systems, please see: www.pickeringtest.com/os
The VISA driver is also compatible with Real-Time Operating
Systems such as LabVIEW RT. For other RTOS support
contact Pickering. These drivers may be used with a variety of
programming environments and applications including:
Pickering Interfaces Switch Path Manager
MTQ Testsolutions Tecap Test & Measurement Suite
National Instruments products (LabVIEW, LabWindows/
CVI, Switch Executive, MAX, TestStand, VeriStand, etc.)
Microsoft Visual Studio products (Visual Basic, Visual C+)
Keysight VEE Mathworks Matlab Marvin ATEasy
Drivers for popular Linux distributions are available, other
environments are also supported, please contact Pickering
with specific enquiries.
Operating/Storage Conditions
Operating Conditions
Operating Temperature:
Humidity:
Altitude:
0°C to +55°C
Up to 90% non-condensing
5000m
Storage and Transport Conditions
Storage Temperature:
Humidity:
Altitude:
-20°C to +75°C
Up to 90% non-condensing
15000m
PXI & LXI Chassis Compatibility
Compatible with all chassis conforming to the 3U PXI and
3U cPCI specification. Compatible with Legacy and Hybrid
peripheral slots in a 3U PXI Express chassis.
Compatible with Pickering Interfaces LXI Modular Chassis.
For information on driving your switching solution in an LXI
environment refer to the LXI Product Guide.
PXI & CompactPCI Compliance
The module is compliant with the PXI Specification 2.2. Local
Bus, Trigger Bus and Star Trigger are not implemented.
Uses a 33MHz 32-bit backplane interface.
Safety & CE Compliance
All modules are fully CE compliant and meet applicable EU
directives: Low-voltage safety EN61010-1:2001,
EMC Immunity EN61000-6-1:2001, Emissions EN55011:1998.
Please refer to the 200 page
Pickering Interfaces “Connection
Solutions” catalog for the full list
of connector/cabling options,
including drawings, photos and
specifications. Available in either
print or as a download.
Alternatively our web site has
dynamically linked connector/
cabling options, including pricing,
for all Pickering PXI modules.
Ever wondered what PXI is all
about?
Pickering Interfaces’ “PXImate”
explains the basics of PXI
and provides useful data for
engineers working on switch
based test systems.
The PXImate is available free
on request from the Pickering
website.
“The Big PXI Catalog” gives
full details of Pickering’s entire
range of PXI switch modules,
instrument modules and
support products.
At over 500 pages, the Big
PXI Catalog is available on
request or can be downloaded
from the Pickering website.
The “PXI
Module Map”
- a simple fold-
out selection
guide to all
Pickering’s
1000+ PXI
Modules.
The “Cables &
Connectors
Map” - outlines
the cable and
connector
options
available
for all PXI
Modules.
Latest Details
Please refer to our Web Site for Latest Product Details.
www.pickeringtest.com

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SECTION 2 - TECHNICAL DESCRIPTION
Page 2.1
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PXI ISOLATED POWER SUPPLY MODULE 41-720
SECTION 2 - TECHNICAL DESCRIPTION
FUNCTIONAL DESCRIPTION
Figure 2.1 - PXI Module 41-720: Functional Block Diagram
A functional block diagram is provided in Figure 2.1. The Module is powered by +5V and +12V inputs via Compact
PCI connector J1. The interface to the user test equipment is via the front panel mounted 1mm connectors or a
9-pin D-type connector, J2. The module comprises a PCB populated with one bipolar DC/DC converter (PSU 3 -XX
outputs) and two single DC/DC converters (PSU 1 - YY outputs and PSU 2 - ZZ outputs) with associated control
logic. Each converter is switched by a +12V relay. The relays are energised via control signals from the control logic
which is addressed by PCI bridge U1 to output the required signal. LEDs PSU 1, PSU 2 and PSU 3 indicate if their
associated DC/DC converter is providing an output. Module conguration is determined by hardwired links and data
stored in EEPROM U7. PCI Bridge U1 is congured by EEPROM U2.
CONTROL
CONTROL
CONTROL
PCI
BRIDGE
U1
ISOLATED
BIPOLAR
POWER SUPPLY
PSU 3
ISOLATED
POWER SUPPLY
PSU 2
ISOLATED
POWER SUPPLY
PSU 1
V+
V-
COMMON
V+
COMMON
V+
COMMON
+5V PXI SUPPLY
PCI BRIDGE
CONFIGURATION
U2
TERMINATING
RESISTORS
R3 TO R14
COMPACT PCI BUS CONNECTOR J1
+5V
0V
PSU 1 PSU 3 PSU 2
+12V
CONTROL
LOGIC
U3, U4
U5, U6
MODULE
CONFIGURATION
U7
D-TYPE
CONNECTOR
OR
BAYONET
CONNECTORS
PSU 1 = Y (Single Rail) [Sub1 Bit1]
PSU 2 = Z (Single Rail) [Sub1 Bit2]
PSU 3 = X (Dual Rail) [Sub1 Bit3]
MAXIMUM FREQUENCY OF OPERATIONS AT FULL LOAD
At full load breaking contacts can create a signicant amount thermal load inside the relays by the generation of
strong signal arcs. If the relays are operated near full load then the rate of operations (a complete on and off cycle)
should be limited to a repetition rate of 0.3Hz to avoid the resulting heat damaging the relay plastic components.
Repeated operation at closer time intervals under full load will result in premature relay failure.

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SECTION 3 - INSTALLATION
Page 3.1
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PXI ISOLATED POWER SUPPLY MODULE 41-720
SECTION 3 - INSTALLATION
Page 3.1
REED RELAY MODULE 40-110/115/120/125
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kg
PREOPERATION CHECKS (UNPACKING)
1. Check the module for transport damage and report any damage immediately to Pickering Interfaces.
Do not attempt to install the product if any damage is evident.
2. Position the chassis relative to any other equipment the module(s) will connect with. Ensure the chassis is not
connected to the electrical supply.
3. Ensure that the designated area for the chassis containing the module is of at and solid construction to
withstand and support the combined weight of the module(s) and chassis.
SECTION 3 - INSTALLATION
!
Refer to the Warnings and Cautions at the front of this manual
Modular products require installation in a suitable PXI/LXI chassis. The module is designed for indoor use only.
Figure 3.1 - Installing the Module into a PXI/cPCI/LXI Chassis
PXI / LXI Chassis

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SECTION 3 - INSTALLATION pickering
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Page 3.2 REED RELAY MODULE 40-110/115/120/125
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SECTION 3 - INSTALLATION
SOFTWARE INSTALLATION
First install the appropriate Pickering PXI switch card drivers by running the installer program Setup.exe (provided
in a compressed zip le), either from the CD-ROM supplied, or by downloading the latest version from our website
pickeringtest.com - the recommended method. Setup is accompanied by a ReadMe le containing
additional installation information. A single installation covers all cards in the System 40, System 45 and System
50 ranges.
When installation completes, the installed drivers’ ReadMe le is offered for display. It can also be displayed
later using a shortcut on the Programs>>Pickering menu.
If you are not a LabVIEW user you should choose the “full” version, and once that has been installed run
the LabVIEW Runtime Engine installer via the shortcut on the Programs>>Pickering menu. In the absence of
LabVIEW the Runtime Engine is required to support the Pickering Test Panels application.
!
HARDWARE INSTALLATION
ELECTRICAL CONNECTION (CHASSIS)
1. The chassis must be electrically installed in accordance with local regional electrical codes by a qualied
engineer.
2. The chassis must be grounded.
Electrostatic discharge can damage the components on the module. To avoid such damage in handling the
board refer to page VII.
Ensure that there is adequate ventilation.
The module should be installed in accordance with the following procedure:
1. Ensure that the system is turned OFF but still connected to mains so that it remains grounded.
2. Choose an appropriate slot in the rack.
3. Remove the blanking plate for the chosen slot.
4. Ensure that the injector/ejector handle is in its downward position. Align the module with the card guides on
the top and bottom of the slot.
Do not raise the injector/ejector handle whilst inserting the module as the module will not insert properly.
5. Hold the handle whilst slowly sliding the module into the card guides until the handle catches on the injector/
ejector rail (refer to Figure 3.1).
6. Raise the injector/ejector handle until the module rmly seats into the backplane. The front panel of the
module should be ush with the front panel of the chassis.
7. Secure the front panel of the module using both screws to the chassis front panel mounting rails.
8. In a system employing a remote control interface to connect an external controller to a PXI chassis or to link
multiple chassis, power-up the system as follows:
a. For a system comprising an external controller and one chassis, power up the chassis before powering up
the external controller.
b. For a system comprising more than one chassis, turn ON the last chassis in the system followed by the
penultimate, etc, and nally turn ON the external controller or chassis containing the system controller.
9. For Pickering Interfaces modular LXI installation there is no requirement to use any particular power up
sequence.

SECTION 3 - INSTALLATION
Page 3.3
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PXI ISOLATED POWER SUPPLY MODULE 41-720
SOFT FRONT PANEL INSTALLATION
The installation of the soft front panel utility is through a basic windows install package found on the distribution
DVD.
1. Locate and run the installer package in the folder DVD:\Applications\Soft Front Panels. Run the installer
PSU_Panel.exe
2. Follow the on screen instructions, selecting a different target directory if required. It is recommended that it be
installed to the default Pickering directory created during driver installation (usually C:\Pickering).
3. Once installed a new program group should be available on the Programs\Pickering menu location.
This will install the soft front panel utility and the corresponding windows help le.
To un-install, either use the windows Add/Remove Programs procedure or run the Uninstall 40-26X soft front
panel menu item in Programs\Pickering\PSU_Panel
For instructions on how to operate the module via the Soft Front Panel, please refer to “Using The Soft Front Panel”
at the end of Section 4 of this manual.
Figure 3.2 - Soft Front Panel For The 41-720
SOFTWARE INSTALLATION
First install the appropriate Pickering PXI switch card drivers by running the installer program Setup.exe, either from
the CD-ROM supplied, or by downloading the latest version from our website http://www.pickeringtest.com - the
recommended method. There are different versions of the Setup program to suit different Windows versions and
software environments. Setup is accompanied by a ReadMe le containing additional installation information. A
single installation covers all cards in the System 40, System 45 and System 50 ranges.
When installation completes, the installed drivers’ ReadMe le is offered for display. It can also be displayed later
using a shortcut on the Programs>>Pickering menu.
If you are not a LabVIEW user you should choose the “full” version, and once that has been installed run the
LabVIEW Runtime Engine installer via the shortcut on the Programs>>Pickering menu. In the absence of LabVIEW
the Runtime Engine is required to support the Pickering Test Panels application.

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SECTION 4 - PROGRAMMING GUIDE
Page 4.1
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PXI ISOLATED POWER SUPPLY MODULE 41-720
SECTION 4 - PROGRAMMING GUIDE
PROGRAMMING OPTIONS FOR PICKERING INTERFACES PXI CARDS
Software drivers are supplied for Microsoft Windows operating systems, with specic support for the following
development environments:
●Microsoft Visual Studio (VB, C++, C#)
●Borland C++
●National Instruments LabWindows/CVI
●National Instruments LabVIEW and LabVIEW RT
Windows drivers are supplied in the form of Dynamic Link Libraries, which should also be usable in any other
development environment that supports them.
Some recent drivers developed for the LXI platform are capable of addressing both PXI and LXI domains. Such
duality may be of help to users considering future migration from PXI based systems to LXI based systems, or
indeed systems containing both PXI and LXI components.
Programming for PXI
A number of different Windows drivers are available to meet particular system requirements, and should none of
these be suitable there is also the option of register-level programming. Drivers are generally ‘universal’, handling all
models in the System 40, 41, 45 and 50 ranges. Please note that this documentation is available in its most up-to-
date form as HTML help les, fully hyperlinked for easy access - both pipx40 and Pilpxi documents are included in
the Pipx40vpp software installation.
VISA Driver for Windows - pipx40
The pipx40 driver conforms to the VISA (Virtual Instrument Software Architecture) standard for programmable
instrumentation. Instrument control environments such as LabVIEW and LabWindows/CVI are based on VISA, and
pipx40 support libraries are provided for them.
Prior installation of VISA from National Instruments is required for the operation of this driver.
Where VISA is available, pipx40 can also be used in general-purpose programming environments such as Visual
C++ and Visual Basic. When IVI is not a system requirement this driver will often yield faster operation than the
pi40iv driver.
Direct I/O Driver for Windows - Pilpxi
The Pilpxi driver accesses cards directly, without using the VISA software layer, while offering similar overall
functionality to pipx40. It is most commonly used in general-purpose programming environments such as Visual
C++ and Visual Basic. Operating speed of the VISA and Direct I/O drivers is generally comparable.
Register-level Programming
Where the supplied drivers are not suitable, register-level programming can be employed - for example:
●If the functionality of the supplied drivers does not meet the application requirements
●If security considerations demand full source-code for the application
●In development environments that have alternate mechanisms for accessing PCI bus
●For operating systems other than Windows

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PXI ISOLATED POWER SUPPLY MODULE 41-720
General Pickering Card Architecture
With most drivers, before programming a Pickering card it is important to understand the basic architecture of
Pickering cards.
The switches on a Pickering card are organized into logical sub-units, each sub-unit containing a set of objects of
similar type and use. These objects may be switches, digital outputs, digital inputs, resistors, power supplies etc,
depending on the nature of the specic card.
For example a simple matrix card will usually contain a single sub-unit containing the switches arranged in a
2-dimensional array. However a similar card with additional isolating relays connected to the matrix will contain
additional sub-units containing those isolation relays.
Low level drivers include functions to allow the programmer to query the card to ascertain the number of sub-units,
and the size and type of each sub-unit.
For full details of the driver functions available the programmer should refer to the documentation provided.
41-720 MODULE ARCHITECTURE
The Isolated Power Supply 41-720 consists of 1 Output Sub-Unit with 3 channels and 1 input Sub-Unit.
BIT TO RELAY FUNCTION CROSS REFERENCE TABLE FOR 41-720
OUTPUT SUB-UNIT BIT FUNCTION
1 1 PSU 1 ENABLE
1 2 PSU 2 ENABLE
1 3 PSU 3 ENABLE
INPUT SUB-UNIT BIT FUNCTION
1 1 PSU 1 STATUS
1 2 PSU 2 STATUS
1 3 PSU 3 STATUS