Debounce: Eliminate extra on/off transitions

Occur when using mechanical buttons and switches

When a switch or a pushbutton has to be connected to a digital circuit it is often (almost always) a nasty thing, because its unwanted behaviour.

It is a common practice to connect a button or a switch to a digital system (to a microcontroller, to a PLC, or to a PC).

If we measure the voltage at the input of the ACE PLC with an oscilloscope, it would show the following graph.

Debounce can be accomplished without programming.

Between the  »

Go to the Tags tool.  The Input Bits now has the option to set the Debounce length from 0-254 ms (not more than 254).

Thats it.  In most cases, you’re done and there is no need to continue farther.