Low cost control for solenoid valves

[mt_test]

I need to switch 7-9 24V solenoid valves (between 0.2A and 0.8A draw each) at a short distance from the main PC, so I want to run just USB or just ethernet.

I am already going to use a USB Multifunction DAQ (USB-6008) for analog input to take sensor readings. It would be nice to use the TTL-signals from DIO of that card to switch industrial relays (DIN mountable), but the only products I could find were non-industrial relay boards with built in transistors, intended for Arduino/Raspberry Pi. So the solution I have is adding another USB DAQ with SSR outputs (USB-6525) and using that to drive the coils of industrial relays.

Is there a better way to do this? Are their industrial relays that take TTL-level input? Is there an NI card to handle all of this?

[Henrik_Volkers]

There are industrial SSR (solid state relays)with DIN rail mounting that can directly be controled by the 600x (5V 8mA)

EMG 17-OV-TTL/ 24DC/2 

is one search result.

But using 8 of them might cost you more than going the NI 9472 plus chassis way and if you look for industrial solutions I would question a 600x 😉

[Henrik_Volkers]

here is anotherone

and here the DRA1-MPDCD3 seems to fit

[_Bryan]

I have used these before.

https://www.mcmaster.com/#8299K12