Programming tip

[Guest Marco Paulo]

Hello, I would be really thankful if someone could help me. I would like to know what is the most used way to make a program to control a automatic door using just one button to activate it. Using three buttons (one to open, one to close and the other to stop) is easy. But I had problems to program it with just one button (at the first touch it opens, at the second it stops and at the third it closes). Does anyone have an idea? If someone want to send me a drawing, please send it to my e-mail: marco@lmp.ufsc.br. Thanks, Marco

[Guest tony chu]

try to use a CTU counter with preset value 3 to register the no. of touching times. use comparison instruction EQU to check if counter.ACC bit is equal to 1 then latch on open coil. if it is equal 2 then unlatch both open and close coil. if it is equal 3 then latch on close coil. a N/C counter.DN bit can be placed in line with this counter itself for automatic reset of acculumation value.

[KTech 0]

Sounds like an assignment from a class.... it it?