Button change variabel

[jeffcoll]

i have a PmgButton.
When I press it I want to set a variable in the PLC to 1.
If i release the button again, the variable should return to 0?

how can i best do this?

[Kazimierz Heczko]

What you want is possible, but is not very simple.
Problem is, that PmgButton has not defined any value like button state (other object pmgButtonTwo has that value).
Because abowe, yuo can do it useing scripting.
When you use scripting, than you can't directly read/write properties of pmaObjects in script in any pmgObjects. You can do this using methods defined in the pmaPanel object, in which relevant button exists.
PmgButton has two events: onButtonDown, onButtonUp. You can use this events to call method of the pmaPanel defined by you, which is called on server and can access to any pmaObject.
Method in pmaPanel can be defined like that:
name: SetVal, parameters: bVal (true/false)
script in the method:

Code: Select all

pMe.Pm("../Data#vars/value").Value = bVal;


Calling this method from the buttons events like this:

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pMe.PmPanel.Methods.SetVal(1); //in the onButtonDown event, in onButtonUp set value 0


When variable "value" has been defined with "Comm" data extension with possibility to writing value to the PLC, then write to this variable can send this value to the PLC.

Note:
In this case operator have to "wait" when value from pmgButton writes into the variable and after that can release this button, in other case value of the variable can be wrote for very short time.
Better solution is using method AddEventTimer of the pmaRoot object, which can automatically reset value after defined time (i.e. 0.5 second).
Than script in button will be only in one event, better is place it in the onButtonUp event:

Code: Select all

pMe.PmPanel.Methods.SetVal(1);


Script in this method should be like that:

Code: Select all

pMe.Pm("../Data#vars/value").Value = 1;

pMe.Root.AddEventTimer(500, 1, pMe.GetPathName(), onTick);

function onTick()
{
pMe.Pm("../Data#vars/value").Value = 0;
}


This solution is better, because operator must not wait for writing value into the PLC, and application automatically resets value after required amount of time.
This will be work in WEB panels too, because request from button to the application will be send only once and setting and resetting value is whole executed in server part of the application.

Hope this helps

Best regards

[jeffcoll]

do you have an example?

Greetz
Jeffrey

[Kazimierz Heczko]

Example is in attachment.
Best regards