Hello, 

Im new to Logo siemens and I made this post to ask for help in making a "program".

I need to make a "program"/scheme that controls two lights H1 and H2.

> First part: 

Light H1 must work for 24 hours, after which it turns off and the light H2 turns on. Light H2 is lit for 24 hours after which light H2 is turned off and light H1 is turned back on (this is a loop).

> Second part:

Lights have to "exchange" being lit at 12:00 hours (light H1 works till 12:00. And after 12:00 H2 works) this repeats every day but 24 hours must pass before alternating lights.

>Third part: 

There is an Astronomical clock that keeps both lights lit only when its nighttime (after sunset and before sunrise)

I have no problems doing the Third part of this program, but when I try to do First and Second part everything just turns into a mess. Ive been trying to make this program work for some time now and im honestly desperate.

Thanks for taking your time in helping.

Yes, part 2 is a expansion of part 1.

Ill try to make it more clear.

Part 1:

You have 2 lights (H1 and H2) which must be ON for 24 hours.

When one of the lights is ON (working / 1) the other one is OFF (not working / 0). They mustn't work at the same time.

Part 2:

The time when one gets turned OFF and the other one is getting turned ON must be at 12:00 hours (using weekly timer). After the light is lit (turned ON) at 12:00, 24 hours need to pass before its turned OFF. 

So imagine this:

Light H1 is ON and its 11:59. When the clock "ticks" 12:00 H1 MUST turn OFF and light H2 must turn ON.

After 24 hours its 11:59 again. H2 is still ON. After it ticks 12:00 H2 is turned OFF and H1 is turned ON.

This is the task:

One day (24 hours) H1 lights up, and the next day (other 24 hours) H2 lights up. The change happens every day at 12 o'clock.

Hope this helps you understand what im trying to say.

Yes, all 3 parts are combined (they must work together)

But Its not that hard to make the 3rd part. I made it with an AND (&) function and Astronomical clock and I got a Switch to simulate what part 1 and 2 would do (since I cant get them to work).

Ah, I understand what you mean.

Would you know how to set up that in LOGO! ? 

I feel pretty dumb for not understanding how to set up a program for Part 2. that works.

Thank you very much for helping me! :D Cheers!