Help in assigning value to MI

[Kelraz]

Greetings,

 

This is my first message, I'd like to say that I really like this forum - it is nicely designed and appealing to they eye, and the topics are answered rigorously and in depth.

 

Then I'd like to ask, hopefully, not a silly question:

 

I am using a Visilogic 9.5.0, programming a V-130 controller with a V130-VA-TA24 snap in module, and I have the following problem:

 

When trying to assign an value to a MI, memory integer, in the "Online test" mode, I am able to do it to certain MIs, and incapable of doing so with other MIs, as you can see in the attached picture.

[Ryan]

Welcome Kelraz!

 

Glad you like the forum, we are always glad to hear that.

 

It looks like that MI is being used by another process, from the description it looks  like it is linked to a PT100 in the hardware config.  Because of this, the controller will update the MI with the value from the PT100 immediately after you force the value to 0.  This change happens so fast you will not see it in online mode.  If you want to test the linearization function you will have to assign a unused MI to force the value.

 

BTW I should mention that RTDs like PT100 do not need to be linearized in visilogic.  The real engineering value will appear in the linked MI automatically with a resolution of .1 degree.  So if it is 68.5 degrees in the room, the MI will hold 685.

 

If you have any questions, please don't hesitate to ask.

Regards,

Ryan