thedodgy1

fantastic Thanks, that kind of works but i am just unsure where to place the Zone A sensor.

Fantastic? With a "but". And no rating. Ouch!

Well it is not clear which gate you are controlling: (a) Existing Conveyor Stop or (b) Sensor Flag. I am guessing (b) which makes me nervous on how the speed of movement looks like. I may have made a design that would use a cam action that brings the flag in as an ellipse path as to prevent hitting the outgoing car. Then I1 (zone A) would detect the new car which activate the closing of the gate. I1 would detect the car that is standing at the sensor flag.

Same with I2: Detect the car that waits to enter zone A. The timing triggers as the car passes through I2. 

I1 and I2 can then indicate some feedback state of cars waiting to be serviced.

Hard to concretely say anything without proper knowledge of the site. You are the designer, so you will have motivate what is where for which reason.

I did but a thank you, and it is very very much appreciated that you have given me some time.

I will be using sensor at Zone A for the flag opening and i understand your concerns but the way the carriage system works is that the laser level and various other sensors on the system prevent any crashes etc, i only need to control how long its in the oven for because the substrate used is heat sensitive.

Thins is if this was using a S7 -1200 or similar then i think it would not be a problem for me to do with some sort of state sequences. But on the logo sometime you can overthink things.....

Again thanks for the input and if you think of anything else then please let me know.

OFF TOPIC 

thedodgy1

<snip>
Thins is if this was using a S7 -1200 or similar then i think it would not be a problem for me to do with some sort of state sequences. But on the logo sometime you can overthink things.....
</snip>

You are someone with a full bag of experience and knowledge. Yet your response is weak -- which does not suit you. That is said with a tone of encouragement.

You are able and capable to make a program for the LOGO! that delivers a state sequence. Realise that SET and RESET of memory bits is the basis for a sequencer.

Practice in making FBD logics is what stands in your way, in my opinion. There is enough material on this forum and in the Siemens examples to facilitate practice. Consider spending some quiet time to spend time on constructing FBD logics that is unrelated to your many projects. You can even try solving some forum questions. (No need to publish your answers.)

From outside it seems as though the forum is used as a way to 'cheat' on your 'homework'. That may be true or it may false. Just as you are, we volunteers are busy people too. You will not always find answers to your questions. I encourage you to do some practice work with your LOGO! simulator.

If FBD is really your stumbling block - use another brand's controller. I am thinking of the Micro810 from Rockwell as an example. That one is a proper S7-1200 level processor.

Good luck.

I am sorry but i could really do with some help on this, i am finding it very difficult to do what i require, yes i understand the frustrations.

I do understand the logic of the logo and i have made many programs and i only come here for the experience of others and if i am honest, i thought this was the purpose of the forum.

I dont wish to be spoon fed with the answers but i little guidance and if i have not explained myself very good then i can only apologise.

if someone is kind enough to help me then great but i will understand if not.

Again i will try to explain my problem.

The conveyor speed, Stopping and distance is all controlled by others and will have no impact on the below:

I2 = Zone B Throughbeam Sensor

Q1 = Pnuematic Stop Flag for Laser Sensor.

Thanks