Status Word Tag to Single State Integer

Ignition
1

I got some integer tags which bits represents distinct states. I require to convert to an integer tag that represents its state.

Any idea how to best implement this?

My initial approach is to use expression tag, and enable history. I am afraid though this will induce runtime log?

Second approach is to implement on gateway script, and do a write query to database for history?

What do you guys think?

2

Expression tag if you need history. Expression in the UI otherwise.

Consider using the binEnum() function if the bits turn on only one at a time.

3

Ain’t Expression fall same issue with tag value change event limitation? "Tag Change" gateway event script vs "Value Changed" tag value event

4

Expression tags have different execution pool from tag event scripts. And expressions are much more efficient than jython. (Don't use runScript() in your expressions to minimize chances of trouble.)

1 Like
5

Hope I am not bothering.

What is the random integer range I need to generate, to hit the first (least significant) 16 bit of integer tag.

Background:
16 bit from PLC is stored as Integer (Tag) in Ignition.
I want to exercise, write random integer value to bit change the least 16 bit of Integer type.

Edit:
I got a quick answer from AI

random_16bit = random.randint(0, 65535)
print(random_16bit)

or

random_16bit = random.randint(-32768, 32767)
print(random_16bit)

shoot I got this.