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USB-ERB24

USB-based 24-Channel Electromechanical Relay Interface Device

June 2021. Rev 9

© Measurement Computing Corporation.

User's Guide

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Summary of Contents for USB-ERB24

Page 1: ...USB ERB24 USB based 24 Channel Electromechanical Relay Interface Device June 2021 Rev 9 Measurement Computing Corporation User s Guide ...

Page 2: ... in any form by any means electronic mechanical by photocopying recording or otherwise without the prior written permission of Measurement Computing Corporation Notice Measurement Computing Corporation does not authorize any Measurement Computing Corporation product for use in life support systems and or devices without prior written consent from Measurement Computing Corporation Life support devi...

Page 3: ... 3 Functional Details 9 Components 9 USB in connector 9 USB out connector 9 POWER IN connector 10 POWER OUT connector 10 USB LED 10 PWR LED 10 Invert non invert switch S1 10 Pull up down switch S2 11 Screw terminals and relays 11 Relay configuration 12 Relay contact protection circuit for inductive loads 12 Daisy chaining additional relays to the USB ERB24 13 Power limitations using multiple USB E...

Page 4: ...of objects on a screen such as buttons text boxes and check boxes italic text Italic text is used for the names of manuals and help topic titles and to emphasize a word or phrase Where to find more information Additional information about USB ERB24 hardware is available on our website at www mccdaq com You can also contact Measurement Computing Corporation with specific questions Knowledgebase kb ...

Page 5: ...nections with three connections to each relay normally open NO normally closed NC and common C USB out and power out connections support powering and controlling multiple MCC USB devices that support daisy chaining from one external power source and one USB port in a daisy chain configuration 1 Rugged enclosure that can mount on a DIN rail or on a bench The USB ERB24 is powered by an external 9 V ...

Page 6: ...ure these switches before you connect the external power supply to the USB ERB24 Factory configured default settings are listed in the table below Refer to Figure 5 on page 9 for the location of each switch Default switch configuration Board label Description Default setting INVERT NON INVERT S1 Configures the relay control logic parity per relay bank for invert or non invert logic Non invert Pull...

Page 7: ...USB bus Figure 4 Resistor pull up down switch S2 PULL UP the relays are put into an energized state at power up regardless of the state of switch S1 PULL DOWN the relays are put into a non energized state at power up Connecting the external power supply Power to the USB ERB24 is provided with the 9 V 3 A external power supply CB PWR 9V3A You must connect the external power supply before connecting...

Page 8: ...ED turns off To restore communication disconnect the USB cable from the computer and then reconnect it This should restore communication and the USB 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 1 Unplug the USB cable from the USB ERB24 2 Unplug the external power cord from...

Page 9: ...n the board and enclosure This connector is a USB 2 0 full speed input connector that you connect to the USB port on your computer or USB hub connected to your computer This connector supports USB 1 1 and USB 2 0 devices Hardware revision G and later are also compatible with USB 3 0 ports The board revision may be determined from the part number label on the enclosure that states 193773X 01L where...

Page 10: ...be disabled The table below explains the USB LED function USB LED Indications USB LED Indication On The USB ERB24 is connected to a computer or external USB hub Blinking Initial communication is established between the USB ERB24 and the computer or data is being transferred PWR LED The USB ERB24 incorporates an onboard voltage supervisory circuit that monitors the external 9 V power If the input v...

Page 11: ...res relays 21 through 24 PULL UP The relay energizes at power up regardless of the state of switch S1 PULL DOWN The relays are not energized at power up Use InstaCal to read the current power on state setting for each module group 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 ...

Page 12: ...109 R112 R114 R116 R118 Relays NO contact pull up to USB 5 V pull down user installed R37 R40 R42 R44 R46 R48 R50 R52 R88 R90 R92 R94 R95 R97 R99 R101 R104 R106 R108 R110 R111 R113 R115 R117 Relays NC contact pull up to USB 5 V pull down user installed Relay contact protection circuit for inductive loads When you connect an inductive load to a relay energy stored in the inductive load can induce a...

Page 13: ...T connector on the host device to the POWER IN connector on the slave device This step is required only if you plan to daisy chain power to another device 1 Connect the USB OUT connector on the host device to the USB IN connector on the slave device 2 To add another device repeat steps 1 2 by connecting the slave device to another slave device Note that the last device in the chain is supplied wit...

Page 14: ... polarity User configurable per bank via switch S1 for invert or non invert default Switch settings for polarity can be read back via software through the USB bus Switch settings do not affect the power on condition Non invert mode When 0 is written or read back via the USB bus relays are not energized Invert mode When 0 is written or read back via the USB bus relays are energized Pull up pull dow...

Page 15: ...sers must plan for this drop to ensure the last module in the chain will receive at least 6 0 VDC USB specifications Table 5 USB specifications USB B connector Input USB device type USB 2 0 full speed Device compatibility USB 1 1 USB 2 0 hardware revision G and later are also compatible with USB 3 0 see Note 1 for information on how to determine the hardware revision USB A connector Downstream hub...

Page 16: ... in Enclosure dimensions L W H 482 6 125 7 58 9 mm 19 00 4 95 2 32 in Environmental Table 8 Environmental specifications Operating temperature range 0 to 70 C Storage temperature range 40 to 100 C Humidity 0 to 95 non condensing Main connector Table 9 Main connector specifications Connector type Screw terminal Wire gauge range 12 to 22 AWG ...

Page 17: ...ommon contact 8 NO Relay 8 Normally Open contact 9 NC Relay 9 Normally Closed contact 9 C Relay 9 Common contact 9 NO Relay 9 Normally Open contact 10 NC Relay 10 Normally Closed contact 10 C Relay 10 Common contact 10 NO Relay 10 Normally Open contact 11 NC Relay 11 Normally Closed contact 11 C Relay 11 Common contact 11 NO Relay 11 Normally Open contact 12 NC Relay 12 Normally Closed contact 12 ...

Page 18: ...ntact 20 NO Relay 20 Normally Open contact 21 NC Relay 21 Normally Closed contact 21 C Relay 21 Common contact 21 NO Relay 21 Normally Open contact 22 NC Relay 22 Normally Closed contact 22 C Relay 22 Common contact 22 NO Relay 22 Normally Open contact 23 NC Relay 23 Normally Closed contact 23 C Relay 23 Common contact 23 NO Relay 23 Normally Open contact 24 NC Relay 24 Normally Closed contact 24 ...

Page 19: ...c Compatibility EMC Directive 2004 108 EC Low Voltage Directive 2006 95 EC RoHS Directive 2011 65 EU Conformity is assessed in accordance to the following standards EMC Emissions EN 61326 1 2013 IEC 61326 1 2012 Class A EN 55011 2009 A1 2010 IEC CISPR 11 2009 A1 2010 Group 1 Class A Immunity EN 61326 1 2013 IEC 61326 1 2012 Controlled EM Environments EN 61000 4 2 2008 IEC 61000 4 2 2008 EN 61000 4...

Page 20: ...ion 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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