Re: [Emc-users] Mesa 7i37 board

[Peter C. W. <pc...@me...>]

On Wed, 30 Jul 2008, Eric Johnson wrote:

> Date: Wed, 30 Jul 2008 16:40:39 -0400
> From: Eric Johnson <ehj...@ho...>
> Reply-To: "Enhanced Machine Controller (EMC)"
>     <emc...@li...>
> To: emc-users mailing list <emc...@li...>
> Subject: [Emc-users]  Mesa 7i37 board
> 
> Hi all,
>
> I need some 24V I/O in an application already using the Mesa m5i20 
> controller, and was looking at the 7I37. The inputs are obvious. As for 
> outputs, the manual only refers to 48V. Am I correct in reading the usage as 
> whatever voltage is supplied to the drains (OBITx+ or odd pins between 33 
> and 47) will be the voltage switched, i.e. the drain is effectively shorted 
> to source in the 'on' state?

Yes, the 7I37/7I37T has 8 isolated MOSFET switches (no common pins).

You can connect each switch to whatever voltage you like (within the 7I37 
ratings). You can even switch AC loads by connecting a pair of switches in 
series. Note that the MOSFETS have intrinsic source-drain diodes so they will 
conduct if connected backwards.



>
> Thanks,
> Eric
>
>
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Peter Wallace
Mesa Electronics

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