Input Time

[Gnomes 0]

I've got a quick question that I'm wondering about here as I'm trying to figure out some code that might work with what I'm trying to do. How short of an input signal is allowed for the plc to recognize an input and close the correct contacts in my logic? I'm using a VersaMax PLC with cpu001. Thanks for any help!

[Steve Bailey 118]

There are two components to the duration. First, the signal needs to remain on for the input filter time in order for the input module to recognize it. Once the input module has recognized the signal as being on, it must remain on long enough for the input module to report it to the CPU. This happens once per scan when the CPU queries all of the input modules for their status. So, the longer the scan time, the longer the signal needs to be on to ensure that it gets detected. When your computer that is running the programming software is connected to the PLC and online with logic equal, you can see the scan time displayed at the bottom of the screen.

[Gnomes 0]

Thanks for the help Steve. I will keep that information in mind.