Running Gateway Scripts

Ignition
1

I am running a very simple gateway script that triggers on the tag change of ‘G_Timer’.
The purpose of the script is to simply continuously increment the ‘G_Counter_1’ tag value.

if system.tag.read("[default]G_Timer").value == 1:
	GC1value = system.tag.read("[default]G_Counter_1").value
	GC1value = GC1value + 1
	if GC1value > 9999:
		GC1value = 0
	system.tag.writeBlocking(["[default]G_Counter_1"],[GC1value])

The part I am having issues with is the’ if GC1value > 9999:’ evaluation. It simply does not seem to work. I am rather new to Ignition and Python. I did run a Python script with the same ‘if’ statement nesting, and it works as expected. Any thoughts?

2

If you place your code surrounded by two sets of triple backticks (```) it will format correctly here on the forums. For example:

```
your code here
```

Would you mind editing your post so we know how your code is indented? Otherwise, we can’t accurately asses your code since indentation is integral to its logic.

3

Thank you

4

Unless I’m missing something, I don’t see anything wrong with your logic right off the bat. Is there any other expression, script, or relationship that runs between your G_Timer and G_Counter_1 tags that could be affecting your results?

I would recommend creating a logger and using it to look at the value of GC1value. That will let you know what your values look like during your script execution and hopefully find the problem.

5

Since I see system.tag.writeBlocking you’re using Ignition 8.0.x so, try the following script.

if newValue.getValue() == 1:
	GC1value = system.tag.readBlocking(["[default]G_Counter_1"])[0].value
	GC1value += 1
	if GC1value > 9999:
		GC1value = 0
	system.tag.writeBlocking(["[default]G_Counter_1"],[GC1value])
6

Well, I left last night before I saw these replies. Thank you.
I had closed everything down before leaving and this morning when I restarted everything the script works. G_Counter_1 resets back to 0, as it should.

Rather odd, indeed.

7

When I first noticed G_Counter_1 incrementing higher than 9999 I was using the value in a transaction. I deleted the transaction so the counter was not referenced any other place in my project.