An Example of How To Use the Package

from pycat3 import PyCat3, EdgeTrigger

pc3 = PyCat3()

OR

pc3 = PyCat3(ip='127.0.0.1.1.1', port=851)

write a tag

pc3.write_tag('MAIN.nAlive', 9)

read a tag

print(pc3.read_tag('MAIN.nAlive')

Tags change notification subscription

Make lists of the tags to be monitored (Types: Integer, REAL, BOOL)

tags_int = ['MAIN.Int1', 'MAIN.Int2']

tags_real = ['MAIN.Real1']

tags_bool = ['MAIN.Bool1']

call monitor method from ads instance

pc3.monitor(monitored_int=tags_int, monitored_real=tags_real, monitored_bool=tags_bool)

Access 'data' dictionary to read a certain tag

print(pc3.data['MAIN.Int1'])

Use of Edge Detector

Create your callback function

def my_callback(oldVal, newVal):

print(f"Value changed from {oldVal} to {newVal}.") 

Create EdgeTrigger object wit callback function as argument

detector = EdgeTrigger(my_callback)

Call the detector with the monitored PLC tag

detector1(pc3.data['MAIN.Int1'])