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