Dataset with a Interger to lookup bit location

Ignition
1

I created a Internal Custom property of a Dataset inside a template. Inside the dataset column 1 contains the values 0-31. Column 2 has a string value - Running, Stopped, Paused…etc… I want to do a lookup in the dataset from an Integer in the PLC, but 0 would equal bit 0 and bit 31 would equal value 31 in the dataset. Each Bit in the PLC represents a different status.

Is there an easy way to do this - I was looking at the Logic/lookup function would work - but would need to do a lookup on the bit location. As multiple status bits could be true and it would only show the first bit on.

Thanks for any help on this one.

2

Add this script to your project or Global script library.
This code will return the first bit that is true.

def lowestSet(tagpath):
	import system
	int_type = system.tag.getTagValue(tagpath)
	
	low = (int_type & -int_type)
	lowBit = -1
	while (low):
		low >>= 1
		lowBit += 1
	return(lowBit)

Now I used a Label and added the following code to the Text binding:
I created a dataset called Status on the Root Container.

try(
{Root Container.Status}[
toInt(
runScript("shared.Functions.lowestSet('Test_CLX/Chris')",1000)),1],
"Error")

If the tag value is zero, it will error with ArrayIndexOutOfBounds, so I wrapped it in a try.

Hope that helps.

Cheers,
Chris