Marco_Polo

Thank you Mickey! Well I thought that the pump IN will be turned.off when examine if open (HIGH_LEVEL) became false in the rung 0. I realize now that I was wrong. Like I said in my earlier post I don't have any experience with ladder programming. Only experience that I have is Simulink in Matlab, that is similar to function block diagram. So this program what I am trying to create is only theoretically example how tank control could be done. Thank you for your help.

Hy Guys! I am trying to create a program for tank temperature and level control. Also I would like to control temperature by PID. I don’t have any experience in ladder programming so any kind of help would be welcome. Thanks. Pump IN is turned on by the low-level for along as tank is not full. When the tank become full, high-level will turn off the pump IN. If there is low temperature reading from temperature sensor, the heater will be turned ON, a long as temperature in tank doesn’t reach desired value. When the liquid in tank reach desired temperature, and tank is full the pump OUT will be turned on. Pump OUT will be turned on until liquid level e doesn’t decrease to the low-level value. TEMPERATURE AND LEVEL CONTROL_BAK001.RSS