Here We Go. I have been asked to produce a program using GX Developer. The PLC i have to use is a Mitsubishi FX1N(C). I have to produce a program which will control a temperature sensitive fan heater in a hallway which leads to 2 adjacent rooms. The Heater and fan are designed to operate under the following conditions: Input the temperature from the two rooms in degrees celsius. Find the average temperature between both rooms Contert the temperature into degrees fahrenheit Compare the temperature to a preset value of 72 (+ or - 2.75%) so basically 70 - 74 If the temperature is below 70 degrees F, then the fan and heater will operate and a 1.5 second flashing alarm will be energised until the temperature is increased to its pre-set value. If the temperature is above 74 degrees F, then the fan will operate and a 1 second flashing alarm will be energised until the temperature is increased to its pre-set value. If the temperature is between 70 and 74 degrees F then the fan and heater should be switched off. In addition, count the number of time the temperature has been outside of the pre-set range in a 2 hour (use 20 secs for this example). Indicate this ammount using BCD on the output display LED's ___________________________________________________________ I have already started this program but was unable to finish and i dont own a PLC or a copy of GX Developer at home and I no longer have any lesson time on this. I know it is abit too much to ask but try and think of it as a challenge or a brainteaser. Heres what i have so far i have no idea if this is right or wrong: http://i63.photobucket.com/albums/h137/chriswall89/PLCsAssignment.jpg excuse the quality of this picture. I had to make the quality lower in order to upload the picture. If you need this then i will gladly email. If anyone does help either send me the file via email or post a picture of the ladder diagram please. Thanks in advance to anyone who helps or tries to help.