Reuse signal in postgui hal file

Hello,
I would like to show the spindle frequency on my HMI.
The frequency is read through modbus and it's linked already to a signal "actual_speed", I use it to perform some check in ladder..
Well, in postgui, I would like to use the same signal and link it to a HALLabel.
It's possible to reuse the signal defined in the HAL file into postgui HAL?
Should I copy it in a ladder pin?
Thanks
Bye
Andrea

Guglielmi wrote:

It's possible to reuse the signal defined in the HAL file into postgui HAL?

Probably yes, give it a try, LinuxCNC is pretty good at pointing out errors.

Of course I tried a lot before write.. so just reusing the signal doesn't work, in postgui raises an error for signal not existing, I tried also to use a classicladder variable even it's not a nice solution without find a way.
I searched a lot in HAL documentation and on the web looking for a kind of syntax to define signal global.. nothing.
I had the idea to move all related to spindle frequency in the postgui.. maybe in this way it works but I'm also curious to know if it's possible.

So I wrote the post.

Code in the mail HAL:
Code in postgui HAL:

It doesn't work, error:
hmi_postgui.hal:31: Pin 'classicladder.0.floatin-00' was already linked to signal 'actual_speed'

but again here I'm trying to use floatin-00, I prefer to use actual_speed directly if possible.

Thanks
Andrea
 

Does this work?

The problem is that  AG_CncHmi.lblFreq is a label of my HMI so it should be handled in postgui,
this line of code is in the main HAL ...

Guglielmi wrote:

The problem is that  AG_CncHmi.lblFreq is a label of my HMI so it should be handled in postgui,
this line of code is in the main HAL ...

That is not a problem. Using a postgui file just changes the order of hal loading. Its still updated in real time, but the gui may not refresh immediately.
Alternatively, use this in your postgui

Thanks for answer.
the order of call is the correct one if I'm not wrong:
So the postgui is called after.. the order you mean the order inside the ini, right?

I tried your line of code and it works.. incredible because it was the first I try.. or most probably the mistake is
that I tried with:

maybe it is considered differenty.. I got this error:
hmi_postgui.hal:27: Pin 'actual_speed' does not exist

that confused my.. "does not exist" it's not really true. It works just removing SpindleFreq signal.. 
Perfect! Tanks a lot rodw!