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I ended up using delays to give the system time to move far from the threshold levels. The hysteresis is somewhat funny though. Yes it tries to provide a stable output for small fluctuations around the threshold levels but it can be flickering again. For example, without hysteresis and TL at 5 bar it flickers for any point between 4.95 and 5.05. With hysteresis it does not flicker between 4.95 and 5.05 but it flickers between 4.90-4.95 and 5.05-5.10 :D For that reason I gave up on the hysteresis and tried to do it manually from inside the program. If you ask me, non of these solutions is ideal and I believe that expensive instruments that provide HyperAccuracy can be used for higher precision. But that would require much higher budget. Do you agree with me or I should have done things differently ???

The sampling speed is quite fast actually. I've tried the hysteresis with no luck. Like I said before I had the Set point 1 at 3.80 and reset point 1 at 3.75 and I was expecting it to stay stable around that point and when the pressure was close to that value it started to flicker like crazy :'( Cheers. PS:I am very new to these so maybe I am missing something out.

Hello everyone!   I have programmed a PLC to take certain actions depending on the pressure fluctuations in the system. It is pretty str8forward, however I am having problems when: The pressure changes suddenly (so fast) that the PLC (or the sensor???) cannot sense or detect that the threshold was passed and the counter I am using for my steps does not count up or down. If the pressure in the system is not stable around the threshold levels then it messes up with the steps of the process and if not the relay outputs of the plc open and close like crazy until the fluctuation is further from the threshold level. For example if my step changes at 5 bar and the sensor is giving me 4.95 to 5 for a few seconds the above statement is true until the sensor reads 4.90 to 4.95. Same goes for the upper level. On the 1st issue I believe that since my analogue signal from the sensor is quite accurate as I have also measured it with a multimeter. My sensor is this one : https://www.festo.com/gb/en/a/8022825/?q=8022825~:festoSortOrderScored and my PLC is this one : https://www.festo.com/gb/en/a/8022825/?q=8022825~:festoSortOrderScored . I hope what I wrote was not very confusing. Any help is much appreciated. :)

Well, the software is up to date and the controller is on the list already, so I have selected it from there and not added as new. It also says millenium 3 on the controller which is the name of the software used. Previously they used to write millenium 2.

Hello everyeone, the compamny I am working for is using Crouzet smart relay for small applications and this is the first time I get my hands on them too. The problem I am having currently is that the millenium 3 software fails to communicate with the controller.  In here communication problem - type of controller you can find the exact error. The controller I am using is CD12 - 230V AC SMART (product no. 88 970 043). I have tested the connection in the program and it finds the (or a) controller (in port COM8) but it cannot write the program to it because of the error shown above. I have tested it with another controller type and it was working fine. Anyone's ever had a similar issue or knows how to resolve this ??? Thanks a lot !

hey dan,I am fresh grad and I have same issues with you :S However i dont have the luck to work in plc programming hence i am lacking some experience :S if you or anyone in here watching this , i am open to some guidance using step 7. I actually need someone to give me projects to solve them in s7 and also give me some tips or some training on the program.I have good exp in plc programming but not with s7 :) Thank you for your time !

Hello guys, since I have recently graduated from my MSc in Automation & Control Engineering and been looking for a job (8months so far and still counting),I am forced to swallow the fact that if I got no working experience I am not getting nowhere close any job.Sadly I come from a country that is not Industrial hence I had to look online bla bla bla. To not bore you with any more details , I have decided to practise on my own and solve real life projects , starting from small ones and also start programming with some commonly asked languages such as RSLogix or some of the siemens s7 environments. The reason I am here for is simple.I need someone experienced to suggest me 1 program to program with + give me small projects that I can try to solve on my own and keep going.Also some tips on the way would be great. I have programmed before an AC500 plc for an elevator project, a siemens logo (not industrial plc) for my BSc Thesis and have done generally academic work around PLCs. Now I am not the type of a guy that would just put PLC working experience before I feel confident in what I am doing. Anyway,thank you for time and I hope I would be hearing from someone anytime soon.

Hello guys, since I have recently graduated from my MSc in Automation & Control Engineering and been looking for a job (8months so far and still counting),I am forced to swallow the fact that if I got no working experience I am not getting nowhere close any job.Sadly I come from a country that is not Industrial hence I had to look online bla bla bla. To not bore you with any more details , I have decided to practise on my own and solve real life projects , starting from small ones and also start programming with some commonly asked languages such as RSLogix or some of the siemens s7 environments. The reason I am here for is simple.I need someone experienced to suggest me 1 program to program with + give me small projects that I can try to solve on my own and keep going.Also some tips on the way would be great. I have programmed before an AC500 plc for an elevator project, a siemens logo (not industrial plc) for my BSc Thesis and have done generally academic work around PLCs. Now I am not the type of a guy that would just put PLC working experience before I feel confident in what I am doing. Anyway,thank you for time and I hope I would be hearing from someone anytime soon.