propertyChange is not being triggered

Ignition
1

hello everyone,

I have an "image" component where I want it to be shown when some values change, but it is not being executed.

# Read custom property values
sp_p = event.source.SP_P
active_power = event.source.Active_Power
timer_value = event.source.timer

# Calculate the condition
#condition_met = (abs((sp_p - active_power) / active_power) * 100 > 115) and (sp_p_2 > 0.25)
condition_met = sp_p > active_power

if condition_met:
    timer_value += 1
else:
    timer_value = 0

# Updating the timer
event.source.timer = timer_value

image
image946×371 25.9 KB

what am I doing wrong?

2

You aren't checking the property name. You won't make much progress until you indent everything and put if event.propertyName == 'something': ahead of it. In Vision, property change scripts run for every property that fires changes. You must filter for the properties of interest.

1 Like
3

Thanks, Phil. Initially, it worked for me by adding the condition:

if event.propertyName == 'something'

and that 'something' would be a custom property. It ended up like this:

sp_p = event.source.SP_P
active_power = event.source.active_power
timer_value = event.source.timer
counter = event.source.counter

if event.propertyName == "counter":
    if sp_p >= active_power:
        timer_value += 1
    else:
        timer_value = 0

    event.source.timer = timer_value

the counter is incrementing every second, I did this from the gateway event script.

What I wanted was for the component to be visible only if the condition is met for more than 10 seconds; otherwise, it should not be shown. By doing this and adding a visible expression, it worked:

{[PROJECT]System/TEST/Temp_condition_Timer/Condition_Timer_2_2_1} >= 10

thanks again.

4

Note that even your other property accesses should be inside the if, for best performance of all the events that you don't process.

2 Likes