USB1024HLS - switching 24V signal output

[Drew]

I have used USB2408 in the past on other projects, but it does not have enough digital outputs.  So I am planning on supplementing it's analog inputs with a USB1024HLS.

I need about 16 Digital outputs and need to control 24VDC relays with a current draw of 14.5mA per relay.  I have a 24VDC power supply and plan to configure the Digital Outputs with a sinking configuration (24V+ to relay, relay to digital out, 24V- to digital ground).

I am planning on using the Murrelektronik 52000 slimline relay.

Will this work with the USB1024HLS?  Or is there another product I should consider?

[Fausto]

@Drew,

The 5V Panasonic relay should work with the USB-1024HLS device.

Regards,

Fausto

[Fausto]

Hello @Drew.

We do not recommend connecting a 24 VDC source to the USB-1024HLS digital lines, which are rated for +5 V levels.  Also, the USB-2408 digital lines are rated for +15 V max.

The example below uses an USB-1024LS with a Fairchild Semiconductor 14N05L N-Channel power supply MOSFET to drive a +24 VDC signal to a relay.  

 

Regards,

Fausto

[Drew]

Thanks! Very helpful information!

I did some more research based on your information and found a product that might make things even simpler and I don't need to use the 24V relays I was planning on using.

https://www.amazon.com/gp/product/B09PGFBTFR

This product uses the Panasonic APAN3105 relay, is DIN mountable, 5 Amp current rating, and comes in multiple channel options.  It meets my output needs and the relay draws at most 22mA per channel plus status led current (less than 64mA sink limit) and it has relay coil protection with a freewheeling diode.

I will be using an external 5V power supply in order to not tax the USB supply.  Do you see any compatibility issues that I missed?

Drew