I need to build a ladder diagram for the following circuit:
Can some one help me please?I have downloaded STep 7 lite and reading pdfs about ladder design.
The projects purpose is the following:
We have a warehouse with 2 entrances as shown down below.One for entrance the other for exit.
There is a photocell in the first entrance that detects the incoming truck and turns the trafic light to red so the next truck knows that it has to wait.Also it gives signal to a counter so that the number of trucks entering the warehouse can be limited and monitored!
Then at the exit an other photocell detects the outgoing truck and gives a signal to trafic light to go to Green so the next truck can enter!
The green must be lit when truck is gone so the 2 photocells dont go on together
If the 2 photocells are On together there is an emergency motor door that closes and the red light is lit again.
Can some one help me please?I have downloaded STep 7 lite and reading pdfs about ladder design.
The projects purpose is the following:
We have a warehouse with 2 entrances as shown down below.One for entrance the other for exit.
There is a photocell in the first entrance that detects the incoming truck and turns the trafic light to red so the next truck knows that it has to wait.Also it gives signal to a counter so that the number of trucks entering the warehouse can be limited and monitored!
Then at the exit an other photocell detects the outgoing truck and gives a signal to trafic light to go to Green so the next truck can enter!
The green must be lit when truck is gone so the 2 photocells dont go on together
If the 2 photocells are On together there is an emergency motor door that closes and the red light is lit again.
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