Measurement Computing USB-ERB08, User Manual

Page 1: ...USB ERB08 USB based 8 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: ...ter 3 Functional Details 9 Components 9 USB in connector 9 USB out connector 9 External power connectors 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 locations and associated contacts 12 Relay contact protection circuit for inductive loads 12 Daisy chaining additional relays to the USB ERB08 13 Power li...

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 ERB08 hardware is available on our website at www mccdaq com You can also contact Measurement Computing Corporation with specific questions Knowledgebase kb ...

Page 5: ...ith 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 ERB08 is powered by an external 9 V regulated ...

Page 6: ...ct the external power supply to the USB ERB08 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 DOWN PULL UP S2 Configures the rel...

Page 7: ...ate 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 ERB08 is provided with the 9 V external power supply CB PWR 9 You must connect the external power supply before connecting the USB connector to the USB ERB08 To connect the power supply to your USB ERB08 complete the following steps 1 Connect the external power...

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 ERB08 If a USB device not recognized message displays when you connect the USB ERB08 complete the following steps 1 Unplug the USB cable from the USB ERB08 2 Unplug the external power cord from...

Page 9: ...als Figure 5 USB ERB08 components USB in connector The USB in connector is labeled USB IN on 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 Revision E and later devices are also compatible with USB 3 0 ports USB out connector Th...

Page 10: ... The USB LED indicates the communication status of the USB ERB08 It uses up to 5 mA of current and cannot be disabled The table below explains the USB LED function USB LED Indications USB LED Indication On The USB ERB08 is connected to a computer or external USB hub Blinking Initial communication is established between the USB ERB08 and the computer or data is being transferred PWR LED The USB ERB...

Page 11: ... 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 ERB08 board s eight sets of 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 Figure ...

Page 12: ...R R5 R7 R10 R12 R14 R16 Relays NO contact pull up to USB 5 V pull down user installed R2 R4 R6 R8 R9 R11 R13 R15 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 large voltage surge when you switch the relay This voltage can severely damag...

Page 13: ...slave device This step is required only if you plan to daisy chain power to another device 2 Connect the USB OUT connector on the host device to the USB IN connector on the slave device 3 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 with external power Power limitations using multiple USB ERB08 devi...

Page 14: ...ble 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 down controls relay power o...

Page 15: ... supply input and the daisy chain output is 0 5 V max Users must plan for this drop to ensure the last module in the chain will receive at least 6 0 VDC A user supplied custom cable is required to daisy chain multiple devices 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 E and later are ...

Page 16: ... Closed contact 1 C Relay 1 Common contact 1 NO Relay 1 Normally Open contact 2 NC Relay 2 Normally Closed contact 2 C Relay 2 Common contact 2 NO Relay 2 Normally Open contact 3 NC Relay 3 Normally Closed contact 3 C Relay 3 Common contact 3 NO Relay 3 Normally Open contact 4 NC Relay 4 Normally Closed contact 4 C Relay 4 Common contact 4 NO Relay 4 Normally Open contact 5 NC Relay 5 Normally Clo...

Page 17: ...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...

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