I created a simple SFC and want to Control a Motor (Control module).

In Step 2 (Processing tab) of my SFC I set MotL.StartAut.Value := true

                                                                     MotL.StopAut.Value := false

It stays in this step until some Transition condition is satisfied. It means, Motor will be running all the time. BUT it doesn't! The Motor is constantly starting and stopping. When I look at CFC, I see that StartAut.Value is constantly changing between 0 and 1. Why could that be?

P.S. Everything is in Simulation mode.

Dear Ashadakoo, 

Let me help you with some questions here. 

1. first question will be , the MotL (control module) , what is the feature bit for feature.Bit4 ? 0-button mode or 1=switch mode? I think it is button mode. 

2. Are you using SFC type or normal SFC Instance chart to start stop? If you use normal SFC instance to start stop, double click on the StartAut of the CM, see how many sfc steps are using the inputs? Any other running chart accessing the input? If you are using SFC type, the just look at the output of the SFC blocks, see whether the value is changing ? which I do not think possible as your transition is not fulfilled, it will not go to next steps and change the output command. 

3. assuming it is button mode, you have configured processing to be MotL_StartAut=1, MotL_StopAut=0, then the output of the sfc should be the same with what you configured. 

4. then when the MotL startAut=1, did the motor trying to start? there is a monitoring time MonTiDynamic default at 3 seconds. Witihin 3 seconds on change in control output, no FbkRun =1, it will went to error. What is your transition condition? is it MotL_Run =1 ? have you connected them ? and the FbkRUn, have you connected ? since this is simulation,you should loop the "Start" output back to FbkRun for simulation purpose. 

Hope this is helpful for you. 

Thank you for trying to help me JazTai,

1) The Motor is in switch mode.

2) I know there are two approaches: SFC Chart and SFC Type. I tried both.

When i connected to SFC Type, the Motor started, no Problem there (FbkRun Shows 0 and start is at 1, Run = 1).

Then I disconnected SFC Type from my Motor and The same I tried with SFC Chart but then the Problem i described in the beginning happens. The Motor tries to start all the time but can't (Start and StartAut are constantly 0 and 1). FbkRun and Start are connected to IN and OUT Drivers, thats it. I didnt connect Start to FbkRun directly. 

I don't understand why it works with SFC Type but not with SFC Chart.

My Transition condition is that PvOut value at PID Controller is lower than 50 (i dont see Problem there). And one more Thing, on Motor faceplate i see it changing Start (green) and stop all the time. And also Simulation changes to time delay (yellow) constantly.

Thank you for the Reply, Oreca.

With an SFC Type I Control a Pump (which is added as a block contact). I connected it to my Motor also and it worked. But when I disconnect the Motor from the SFC Type and Control from SFC Chart, then I have Start-Stop Problem.

Dear ashadako, 

One thing, can you set the MonTiSta to higher values? maybe 6 seconds?

Local settings normally I used "2" (just optional)

What is the online values for the Trip, Protect and CSF?

If you could set it to test mode on, simulate the issue and record a quick video to demonstrate the issue, it will be good. 

I set up a quick test here in my station, set to switch mode, change it to Auto by setting the ModLiOp to 1 and AutModLi to 1, then set MonTi to longer, and set the StartAut to 1, the pump run without issue. 

For switch mode, you may just hide the StopAut and ManModLi. It is useless for Switch Mode. better not to control them. 

StartAut=1 = start, StartAut=0 = stop. 

AutModLi=(1=auto, 0=manual)

I think this issue not related to SFC Chart. May be can you disconnect all the interconnections and test? Then, reconnect one by one again. 

Dear ashadako, 

I think there is no problem with your SFC. When your SFC start,

1. StartAut=1

2. MotL got your StartAut =1 , the Start = 1

3. Wait MonTIDyn for 6 seconds for your FbkRun. 

4. If your FbkRun not equal to 1, Start will be Aborted and changed to 0. 

5. Normally for an internal test, I will connect Start to SimIn in the FbkRun DI channel driver block to simulate the FbkRun feedback. 

Hope this is helpful for you. 

ps:Haha, welcome Oreca for giving any valuable inputs. （I learnt from you too)

Video

still not working. I created a new SFC Chart and still the Motor is not starting, i also tried with a Valve it doesnt open either!