[etherlab-users] RTW Output Assertion

[Robert Hirsch]

Florian,

I'm working with Matt on this project, so I'll attempt to answer your
question; however, it leads to another.

Yes, we were attempting to export the output blocks, which obviously
didn't work.  We implemented your Vector Concatenate suggestion with
success, thanks.

Now that I have the output channels exposed, I'm attempting to set a
value for one of the exposed channels.  I'm using the
Variables::setValue() method; however the variable doesn't appear to
be writeable (Variable::isWrite() always returns false).  I'm checking
this value within my derived process' Notify() method, which is done
after successful getValue attempts.  Am I missing an important step in
configuring the variable as an output variable.

Thanks for your help.

Regards,

Bob Hirsch
JT3, LLC

On Wed, May 5, 2010 at 6:29 AM, Florian Pose <fp at igh-essen.com> wrote:
>
> On Wed, Apr 28, 2010 at 06:00:33PM -0700, Matt Jackson wrote:
> > Richard,
> >
> > Thanks for replying. I suspect this is more of a RTW question than a
> > Pdcom question.
> >
> > We actually are trying to bring up the output devices from Pdcom. We
> > currently have a functioning Pdcom test application based off the
> > example code provided. We haven't attempted a Variable::setValue() call
> > because the EtherCAT slaves don't have any output variables exposed.
> > That is, Process::findVariable() doesn't return any output variables.
>
> I'm not sure, if I understood you right: Are you wanting to export the
> signals, that go into (EtherCAT-) output blocks?
>
> RTW exports block outputs as signals. So one solution would be to select
> the signals of the block outputs, that drive the (EtherCAT) output blocks.
>
> Another way would be to place a dummy block (for example 'Vector
> Concantenate') right in front of the output blocks and give them
> speaking names.
>
>
> >
> > We're using an IgH Starter Kit composed of EL1014/EL3102 input slaves
> > and EL2004/EL4132 output slaves. We're implementing the RTW example
> > design (example.mdl) which has the slave inputs connected to terminator
> > blocks and the slave outputs connected to function generators (pulse and
> > sine wave respectively).
> >
> > What we would like to do is transfer the output slave stimuli to an
> > external application via the pdcom interface. However, all attempts to
> > provide different sources for the output devices (i.e. constant, input,
> > workspace, etc.) have been unsuccessful. We had expected to see
> > variables associated with the individual output channels similar to how
> > the input channels are presented. Is there an API call we're missing
> > perhaps?
>
> A constant does not necessarily generate a signal. Please put a block
> behind it (see above), then it will work.
>
> --
> Best regards,
> Florian Pose
>
> http://etherlab.org
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