More than 32 channels of hardware timed DO? 24V Sourcing would be great.

[JoeLesker]

Hi,

For several projects, I've used a NI-9476 to directly actuate solenoids, taking advangtage of the hardware-timed channels (the 2kHz rate was fine, but wouldn't want to go lower than 1kHz).  It appears that you cannot place multiple 9476 modules in a chassis and trigger/synchronize their outputs.  Can someone confirm?

If that is the case, what is next best option to have more than 32 hardware-timed digital outputs (at ~1kHz)?  Sourcing current would be great, but if need-be, I can place circuity in between the module(s) and solenoids.  Thanks.

-Joe

[RenKylo2]

Hi Joe,

Give this KB a read, it goes over how many HW-timed tasks you can run per chassis/module and why.

In your case, channel expansion might help. Just configure the channels from both modules to be one task. 

[JoeLesker]

Hi Ren,

Thanks for the reply.

To be clear, are you saying that I can place two 9476 modules in a multi-module chassis (like a cDAQ-9174), and create a single task that writes to both module's outputs?

I simulated it in MAX and it seemed to work.  I guess I assumed that this wasn't possible since the 9476 exposes no routing, and lists no start trigger types.  Thanks.

-Joe

[NoHeart43]

Hi Joe,

Yes, I believe that is what Ren is saying. The channel expansion article that Ren pointed you to outlines how to accomplish that and provides some caveats for each device.