USB-6453 - How to Drive Relays

[LuminaryKnight]

I want to submit this device for our test racks.  For what we're doing, this covers the task (with some additional external hardware).  But what's got me perplexed and I was hoping for some help, how does anyone use this to drive relays?  The current out for the digital I/O is very low.  The DIN rail SSRs I'm looking at I believe need something like 100mA.  So how do others drive relays without building a custom board?  I don't see any DIN rail mountable relay driver boards.  Anyone got any advice?

[crossrulz]

How many relays are you trying to control?

In a previous project, I used a NI-9482 in a cRIO to control a relay. A cDAQ would have done the job, but I was already using a cRIO for other reasons and still had an open slot. This module is a 4 channel relay module that I used to switch +24V to control an AC power relay.

[LuminaryKnight]

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@crossrulz wrote:

How many relays are you trying to control?

In a previous project, I used a NI-9482 in a cRIO to control a relay. A cDAQ would have done the job, but I was already using a cRIO for other reasons and still had an open slot. This module is a 4 channel relay module that I used to switch +24V to control an AC power relay.

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6 relays to remain on continuously, an additional 6 relays to alternate on/off.  No more than 500mA through each relay. I looked cDAQ route, but I'm trying to justify this change via cost and the cDAQ route quickly doesn't allow that with my AI needs.

CDAQ route gets up to $4500.

[santo_13]

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@LuminaryKnight wrote:

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@crossrulz wrote:

How many relays are you trying to control?

In a previous project, I used a NI-9482 in a cRIO to control a relay. A cDAQ would have done the job, but I was already using a cRIO for other reasons and still had an open slot. This module is a 4 channel relay module that I used to switch +24V to control an AC power relay.

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6 relays to remain on continuously, an additional 6 relays to alternate on/off.  No more than 500mA through each relay. I looked cDAQ route, but I'm trying to justify this change via cost and the cDAQ route quickly doesn't allow that with my AI needs.

CDAQ route gets up to $4500.

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Usually the DIY arduino relay boards works with digital signals and would work with 6453 digital outputs. Since those are not industrial, I would recommend inserting an opto-isolator to support larger current to control the SSR.

6453 DO --> optocoupler --> SSR