item.Visible = Boolean(Tags("StatusWord").Read() & 2 ** BitNum);

Konstantin_D

I am using a script:

item.Visible = Boolean(Tags("StatusWord").Read() & 2 ** BitNum);

 

 Hi Konstantin,

Can you just give me short explantion of this syntax, what is what in this command?

1. Tags("StatusWord").Read()   - WinCC function to read tag value

2. 2 ** BitNum   - creating mask with single bit (for example 7)

3. Tags("StatusWord").Read() & 2 ** BitNum   - Bitwise AND with mask. Check single bit

4. Boolean(..)   - converting to boolean.

You can read about bitwise operations in Javascript here - https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Bitwise_Operators

var Status = Tags("test").Read(); // read tag value
var BitNum = 7; // change bit number

return Boolean(Status & 2 ** BitNum);

Compilation error - you need to set the event by which the script is executed. For example, by the tag "test".