Looking for timing nodes

[awsteve]

I'm a PLC programmer, so Node-Red is new to me. I'm trying to find some nodes that would be similar to the traditional PLC TON (Timer On-Delay) and TOF (Timer Off-Delay) instructions. Below is an example of the PLC instruction.

I need to monitor an input on a RPi 3 B+ with a Pimoroni Automation Hat. If the input stays on for 2 seconds, I need to trigger an output. If it goes false before 2 seconds nothing should happen and the timer should reset. As soon as the input turns off, the output should also turn off. I was able to get close with the flow below, but the output would also have a 2 second delay to turn off.

The next step of the project is that I need to ignore the input until it is off for a full, uninterrupted, 2 seconds. I'm hoping I can invert the input and use the same logic.

I would also like to find a RTO (Retentive Timer On-Delay) node, but don't have an immediate need.

I appreciate any help. If I can't find a solution this week, I'll order a PLC for pre-processing the inputs during prototyping.

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[dceejay]

The trigger node is your friend - here is a simple example using inject nodes as i don't have a Hat or relays handy.

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Not quite sure what you mean by the second part fo the question re 2 sec delay for off - but this is my guess

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[awsteve]

Thanks dceejay!

You got me going in the right direction. Below is what I came up with. I doubt it is the most efficient programming, but it works!

Start Logic:

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Stop Logic:

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OFF","rules":[{"t":"set","p":"topic","pt":"msg","to":"relay.2","tot":"str"},{"t":"set","p":"payload","pt":"msg","to":"off","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":1330,"y":300,"wires":[["a67f2fa8.ca2fc"]]},{"id":"201a5072.df4f1","type":"change","z":"d509c0e6.089c3","name":"Relay 2 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