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Vidmas30

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  1. V570 and GSM modem

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Good day,

    Couple of days ago had an issue with Cinterion GSM modem: V570 controlls a steam boilers feed water and deaerator. Done some alarm SMS and one status message for myself (when I send "status" to V570 it send me back information about process) The issue was when I changed SMS configuration file and forgot to reboot PLC. Then, when I send a message for status, PLC hanged up (there was a black screen with error message) It was good that I was near. Then after reboot it worked fine, but now I'm afraid to use this feature because don't want PLC to hang again because steam is for production line and it's hard for personnel to start boiler after stopping and theres over 100km to go to that plant.. Yesterday sent several messages, everything was fine, but today one time PLC did't respond. Called to plant asked to go to PLC to see if everything's fine: it all looked good. So question: why in souch case PLC don't responded? Is it normal? Can't calm myself..

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  5. PID question

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Good day, Emil,

    Yesterday played a bit with PID, logged data with PID server, but in the end of the day my laptop (left for some time..) hybernated and when came back PID server crashed and all the data gone.. So I have nothing to show.. Good news is that all went well and now PID works good. Although, there's one thing that bothers me:when changing SP a large step (for example valve CV 50% and when SP lowered CV becomes 0%) valve closes to 0% but there is some wave of CV near the end I mean CV 0% valves positinion goes to 0% and near the end CV 16% then 4% then0% (like some wave). It made a valve to go crazy couple of times.. I think it's not of the sygnal, but of the PID. All, except this issue, works well. (PID parameters P-50.0; I-27; D-37.)

  7. PID question

    in Vision & Samba PLC + HMI Controllers & VisiLogic Software

    Posted

    Good day,

    We got heating unit where v570 controls the condensate boiler (temperature PID loop). First issue was, that when we started to tune the unit, heating system was closed, left working only hot water boilers, so it's small contour. Because of that, PLC couldn't finish PID autotune process, because system heats up quickly and temperature after second wave, stays above setpoint very long time.. So we tuned it manually. The question is: beacause of the same reason (fast heating up) PID block status shows integral wind-down message (when there's no hot water usage). What should we do about it? Is there a chance that because this wind down the integral error will accumulate and PID block stops working? Should we use force integral error block to reset this error? if so, when it would be best to do this? Or maybe someone could share better solution? Thank you!

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