system.opcua.callMethod

Ignition
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1

I tried using system.opcua.callMethod like this:

image

But I get an error in the gateway, I probably entere the wrong parameters…
I got them from UA Expert:

image
image1239×354 39 KB

image

I am not too shure of my inputs: [Number,Active]. I tried [2,3], null and [“Number”,“Active”] but to no avail.

Thank in advance for the help.

2

According to UaExpert that method has no input arguments at all.

3

How do I put this in the method as a parameter? I tried this:

system.opcua.callMethod(
	        "Demag 459",
	        "ns=2;i=601",
	        "ns=2;i=2401",
	        null	        
)

but it returns the folowing error: image

4

Call it with an empty list ([]).

Any values for corresponding Output Arguments will be in the return value of callMethod. See system.opcua.callMethod - Ignition User Manual 8.1 - Ignition Documentation

1 Like
5

Thank you for your reactivity, it worked perfectly.

6

Btw, a null object in Python is None, not null, hence the error you were getting saying it can’t find a variable called null.

2 Likes
7

Sorry to bother you again but I am not sure how to read my values now that I have them…

image
image941×578 87.7 KB

When alarms are runing the results do change but they are not readable integers or string.

8

I don’t really know anything about the method you’re calling so I can’t say for sure, but it looks like the result value (res[2]) is a list containing possibly more lists. You’ll have to index into them and start looking for the values or get some documentation on the method you’re calling.