Drive multiple SSR's with USB-6229

[dacad]

Hi all,

I am preparing a test set-up where I am going to be driving 16 solid-state relays with the digital IO's from a USB-6229 M-Series multi-DAQ.    I have succesfully tested a single ssr by connecting one side the the +5vdc and the other side to a DIO.

I am concerned however that the on-board 5vdc source will not supply enough power to operate all 16 ssr's.  I am using Continental SVDD/1V40 ssr.   http://www.ciicontrols.com/products/svdd.htm   The min/max turn-on voltage and current is  4vdc/6mA and 32vdc/10mA.   The spec sheet for the USB-6229    http://www.ni.com/pdf/products/us/cat_usbmseries_625x.pdf    indicates 1 Amp max power draw (2 Amps when two are combined) which seems as if it will be enough but I am not proficient enough on this hardware to be 100% comfortable in my analysis.   I have already fried a PCI DAQ board becasue I inadvertently ran 24 volts into a digital IO and don't want to fry this thing by doing something incorrectly.

Thanks for the help

Doug

[Wayne.C]

Doug,

Each digital I/O on the 6229 is rated for 24mA, sink or source.  If we were to use a worst case draw of 10mA for each ssr, that is well below the 24mA per DIO and the combined worst case draw of 160mA is well below the limits of the USB-6229.   

[dacad]

That's what I figured but again, just wanted to make double sure (measure twice, cut once kinda thing.)

Thnaks !!

Doug