basic ladder logic

[the engineer]

Dear all , i have to know the ladder logic for bottle filling system, if the tank is empty the sensor will detect and sends the signal to the plc after that i have to open the valve for water filling in the tank , after tank gets full level sensor detects and sends the signal to the plc , now i have to close the valve . so how can i write the program for these functions? NOTE : Above mentioned all were automated not by manual . please give me some ideas or program. with regards , engineer

[RussB]

Most Engineers get paid for this. Around here the average is about $97.88 per hour. I would guess that what you want will be in the vicinity of 10-67 hours, depending on diagnostics needed. Maybe someone will volunteer to do the math for you?

[Crossbow]

Sounds distinctly like a programming lab in a college class. Give it some thought and post your ideas, then people will comment on it. It sounds like a simple latching circuit to me. Take about 30 seconds to write.