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PLC Question for flashing lights with delays

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Eshal

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Hello experts!

I have a question having two parts:

A) Two lights are to flash on and off at different intervals. One is on 5 seconds and off 5 seconds. The other is on 8 seconds and off 8 seconds.

B) Two lights are to flash alternately, one for 5 seconds, one for 8 seconds.

I have done with part B but how to do part A?

Here I have attached the pic of ladder diagram for what I have done in part B

I am using Step 7 by seimens

Please review did I do it correctly and how to do part A

Thank you. Capture.PNG
 

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