Case expression with Binary encoder and timer

Ignition
1

Hello everyone. As this is my second question in the forum, I am still very new to the Ignition software, and I wanted to ask:
Is it possible to use some sort of timer within an expression tag? I have 2 OPC tags that return a boolean value each depending on the respective machine part working or not.

I have the following expression (as example):

switch (binEnc( tag path mode, tag path status)
1,
2,
3,
10,
14,
19,
0)

but I want an extra output state, i.e. 25, when the tag: Mode, is on/true for longer than 1 minute and tag status = x. Since I am using this expression tag as my machine state tag, would this be possible? is there some sort of expression or logic I could use?

thanks in advance and sorry if the question is not 100% clear

2

You can use a tag’s timestamp in your expression.

SWITCH (binEnc( {[~]mode, [~]status, ([~]mode && secondsBetween({[~]mode.Timestamp}, now()) >= 60) )
        0,  1,  2,  3,
        0, 10, 14, 19,
        25
	   )
1 Like
3

Thanks! again to my rescue haha
do you know about some sort of manual where I can learn a bit more (specially examples/exercises) for Ignition's scripting language? the user and function manual does not dive too deep into more complex or compound uses.

4

There really isn’t one. Trial and error are my best friends. That said, you can trial portions in another custom property or expression tag and mix/match however you want in your overall expression.

5

Look at documentation for Python 2.7. Ignore the big banner that it is unsupported. Ignition 8+ uses Jython 2.7, which is the same language with the same built-ins and most of the same standard library. Jython adds the treatment of java packages/classes as importable like python modules/classes.

1 Like
6

To contrast what I was saying to Phil’s post, I was talking more on the expression language than Jython’s scripting language. They are two separate things, and it’s sometime easy to accidentally mix the two.

1 Like