line 10, no probs, a simple test and “do something” by comparing variables
line 20, no probs, after the something is done to disable the “do something”
line 30: IF+ IN1… means (the T3000 doc) " If IN1 is true, and on the previous check it was false"…
IN1 is coming from where and what does it represent ??
the end: OK, I increase the variable by 1, that’s my increased counter
In1 is the input to the controller, say a flow switch or mechanical switch wired to the input terminals of the controller. In the screen shot below it is given a label of AIR FLOW SWITCH with the range set to Off/On.
The IF+ statement catches the first positive going event on the input, the logic will trigger only one time when the switch first goes to ON. This is different from the IF statement which will fire continuously till the switch state goes to OFF.