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Summary of Contents for Measurement Computing USB-ERB24
- Page 1 USB-ERB24 USB-based 24-Channel Electromechanical Relay Interface Device User's Guide June 2021. Rev 9 © Measurement Computing Corporation.
- Page 2 Other product and company names mentioned herein are trademarks or trade names of their respective companies. © 2021 Measurement Computing Corporation. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted, in any form by any means, electronic, mechanical, by photocopying, recording, or otherwise without the prior written permission of Measurement Computing Corporation.
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Page 3: Table Of Contents
Configuring the hardware switches ........................ 6 Relay control logic polarity switch (S1) ..........................6 Connecting the external power supply ......................7 Installing the hardware ..........................8 If your system does not detect the USB-ERB24 ........................8 Chapter 3 Functional Details ..........................9 Components ..............................9 USB in connector .................................. -
Page 4: Preface
Preface About this User's Guide What you will learn from this user's guide This user's guide describes the Measurement Computing USB-ERB24 data acquisition device and lists device specifications. Conventions in this user's guide For more information Text presented in a box signifies additional information related to the subject matter. -
Page 5: Introducing The Usb-Erb24
Rugged enclosure that can mount on a DIN rail or on a bench The USB-ERB24 is powered by an external 9 V regulated power supply that is shipped with the device. USB-ERB24 block diagram USB-ERB24 functions are illustrated in the block diagram shown here. -
Page 6: Installing The Usb-Erb24
Contact us immediately if any components are missing or damaged. Installing the software Refer to the MCC DAQ Quick Start and the USB-ERB24 product page on our website for information about the available software. Install the software before you install your device The driver needed to run the USB-ERB24 is installed with the software. -
Page 7: Connecting The External Power Supply
PWR IN Plug the AC adapter into a power outlet. LED turns on when 9 V power is supplied to the USB-ERB24. If the voltage supply is less than 6.0 V or more than 12.5 V, the LED does not turn on. -
Page 8: Installing The Hardware
LED should turn on. If your system does not detect the USB-ERB24 If a USB device not recognized message displays when you connect the USB-ERB24, complete the following steps: Unplug the USB cable from the USB-ERB24. Unplug the external power cord from the connector on the enclosure. -
Page 9: Functional Details
Chapter 3 Functional Details Components The USB-ERB24 has the following internal components, as shown in Figure 5. Two (2) USB connectors Two (2) external power connectors USB LED PWR LED Invert/non-invert switch (S1) — sets the relay control logic polarity ... -
Page 10: Power In Connector
A user-supplied custom cable is required to daisy chain multiple devices. USB LED LED indicates the communication status of the USB-ERB24. It uses up to 5 mA of current and cannot be disabled. The table below explains the USB LED function. -
Page 11: Pull-Up/Down Switch (S2)
Screw terminals and relays Connect external devices to the relay contacts using the USB-ERB24 set of 24 screw terminals. Each relay has a normally closed (NC), common (C), and normally open (NO) contact. Figure 8 shows the screw terminals on a typical relay channel. -
Page 12: Relay Configuration
USB-ERB24 User's Guide Functional Details Relay configuration You can install a pull-up or pull-down resistor at the NO and NC terminals on each relay. Note that the pull-up resistors are tied to the 5 V power and should be considered when calculating the power budget. The relay configuration is shown in Figure 9 Figure 9. -
Page 13: Daisy Chaining Additional Relays To The Usb-Erb24
The device connected to the computer is referred to as the host device. Each additional device that you want to daisy chain to the host USB-ERB24 is referred to as a slave device. This procedure assumes you already have a host device connected to a computer and to an external power source. -
Page 14: Specifications
Chapter 4 Specifications All specifications are subject to change without notice. Typical for 25 °C unless otherwise specified. Specifications in italic text are guaranteed by design. Output specifications Table 1. Output specifications Number of relays Relay configuration 2 banks of 8 and 2 banks of 4 Contact configuration 24 Form C (SPDT) Normally Open, Normally Closed and Common available at screw terminals... -
Page 15: External Power Input
+9 V ±10%, @ 3 A Note 1: The USB-ERB24 monitors the external +9 V power supply voltage with a voltage supervisory circuit. If this power supply exceeds its specified limit, the PWR LED turns off indicating a power fault condition. -
Page 16: Mechanical
USB-ERB24 User's Guide Specifications Mechanical Table 7. Mechanical specifications Board dimensions (L × W × H) 431.8 × 121 × 20.3 mm (17.0 × 4.8 × 0.8 in.) Enclosure dimensions (L × W × H) 482.6 × 125.7 × 58.9 mm (19.00 × 4.95 × 2.32 in.) Environmental Table 8. -
Page 17: Screw Terminal Pinout
USB-ERB24 User's Guide Specifications Screw terminal pinout Table 10. Screw terminal pinout Signal Name 1-NC Relay 1 Normally Closed contact Relay 1 Common contact 1-NO Relay 1 Normally Open contact 2-NC Relay 2 Normally Closed contact Relay 2 Common contact... - Page 18 USB-ERB24 User's Guide Specifications Signal Name 18-NO Relay 18 Normally Open contact 19-NC Relay 19 Normally Closed contact 19-C Relay 19 Common contact 19-NO Relay 19 Normally Open contact 20-NC Relay 20 Normally Closed contact 20-C Relay 20 Common contact...
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Page 19: Declaration Of Conformity
Date and Place of Issue: May 3, 2016, Norton, Massachusetts USA Test Report Number: EMI4221.05 Measurement Computing Corporation declares under sole responsibility that the product USB-ERB24 Complies with the essential requirements of the following applicable European Directives: Electromagnetic Compatibility (EMC) Directive 2004/108/EC... - Page 20 Measurement Computing Corporation NI Hungary Kft 10 Commerce Way H-4031 Debrecen, Hátar út 1/A, Hungary Norton, Massachusetts 02766 Phone: +36 (52) 515400 (508) 946-5100 Fax: +36 (52) 515414 Fax: (508) 946-9500 http://hungary.ni.com/debrecen E-mail: info@mccdaq.com www.mccdaq.com...
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