Problem configuring text display

Hi,

Working on my first LOGO! project using a LOGO 8 24RCE.

I'm doing an automatic fan control that uses different fan speeds on certain weekdays and hours.

I would like the LOGO to display "Fan speed x", with the x representing the current speed 1 2 3 or 4. My LOGO version is with relay outputs so speed 1 is output Q1, speed 2 is output Q2 and so on. How can I set the display to show which of these outputs is active at the moment? Like in a way that the text "Fan speed" is set, and just the number changes?

There is another fan in this system also, that I would like to see as ON or OFF.

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Best regards
Min_Moderator

Thank you very much, it did solve my problem. As I am new to this, many of the functions and the uses thereof are unfamiliar to me.

In case someone uses you FAN file as is, note that if inputs 2 and 3 are active at the same time, the display will show this as fan speed 4.

My attachment is my project, please have a look and comment. There might be things that are made in a way that is not the smartest possible. I'm open to criticism. I will describe the physical system below, and also describe what kind of functionality I am looking for in the finished system.

So, the environment for this system is a automotive workshop. There are 3 main components in the shop's ventilation system:

1) Roof ventilator (huippuimuri). This is the main fan for the shop which evacuates air. It will be controlled by the PLC using 4 relay outputs resulting in 4 different selectable fan speeds. The PLC outputs will be wired to a frequency modulator with digital inputs, so the fine tuning of the system will be easily done by adjusting the output frequency for each speed on the FM user interface. This setup will also act as a backup in case the PLC fails, most FMs have a button which lets you select Local or Remote mode. Local means you control the output manually on the FM UI, remote mode is the preconfigured actions that the digital inputs switch on.

2) Exhaust gas extraction fan (pakokaasuimuri). This is the fan of a standalone system that is dedicated to take care of exhaust gases of cars that are running inside the building. It has got nothing to do with the normal ventilation of the building, it's only actual task is to extract toxic gases.

3) Air delivery unit (tuloilmakoje). This unit has a "door" that has 2 positions. The first position is mechanically set so the door is slightly open so it will allow sufficient flow for the low roof ventilator speeds. The fully open position is achieved with the use of a damper motor (peltimoottori), this is actuated when there is a high demand of air delivery. This unit also has 2 sets of electrical heating elements to warm up incoming air if necessary, the PLC will switch on one or both elements (lämmitys 50/100%). There also is a 2-speed fan to cool off the elements if necessary (tuuletin)

This system was custom made because home controls do not have the necessary features, and commercial controllers are made for premises many times bigger than this. I think the last drop was when I saw the price and features of the controller you could buy to control the air delivery unit..

The LOGO!

Ok, all inputs will be wired with momentary pushbuttons for manual control. Input 1 is the on/off for the exhaust gas fan. Inputs 2 3 4 5 represent the 4 different roof ventilator speeds, these will get weekly timers that have a pulse output. In this way I think it is easy to just set the time you wish for a "button push" for a certain fan speed. It will also return to automatic pre-programmed mode the next time a timed event occurs, even if someone has manually selected something else in between.

Since the exhaust fan will extract as much, or even more air than the roof ventilator on low speeds, the PLC will shut down the roof ventilator when the exhaust fan is in use. If the roof ventilator is on spped 1 or 2, that is. If it is on full speed (4) and the exhaust fan is switched on, the roof ventilator will drop down to speed 3. On these high ventilation situations the demand for incoming air is bigger than normal, so the damper motor will be actuated to open up the door for less air restriction.

The heating and fan of the air delivery unit will simply be controlled by a yearly/weekly timer, plus two thermostats. If the inside temp gets low enough to trig thermostat 1, the PLC will activate heating with 50% power. Fan will start at speed 1, and stop with a off-delay to cool down the heating element. If the temperature still drops so much thermostat 2 trigs, heating element 2 will also be switched on, and fan speed increases to 2. There is also a off-delay, the fan will be at speed 2 for a certain time after heating element 2 is shut off. I know this could be built much more sophisticated with two temperature sensors, one monitoring outside temp and the other monitoring incoming air temp, but I do not have the drive to do it right now. Maybe will update the system later.

Feel free to comment! 

Oh yes, and newbie it needs to be because I truly am one. First project as i mentioned. I just wanted to mention this if someone else uses it. 

One thing I suspect is not made the smartest possible way: the way I have designed that every selection of fan speed resets all the other 3 different speeds' relays.. I did not find any other way than use a lot of flags to separate inputs from looping to outputs. Any hints on this?