Posted 5 Sep 2018 Hi there .. i am new to plc... i have flow rate in m3/h and i want total flow or totalizer ... what is the formula for that and how can i implement it in gx developer. any kind of help will be a life saver. Share this post Link to post Share on other sites
Posted 5 Sep 2018 http://plctalk.net/qanda/showthread.php?t=35674 The above thread is for Siemens but you can apply the formula. Hope this helps you out. Regards, Garry Share this post Link to post Share on other sites
Posted 6 Sep 2018 (edited) A total flow is calculated as follows:Qn = (Vn + Vn-1)*dT/2 + Qn-1 , where - Qn is a total flow at current measurement; - Qn-1 is a total flow at previous measurement; - Vn is an instantaneous flow at current measurement; - Vn-1 is an instantaneous flow at previous measurement; - n is a number of measurment (starting from 1) - dT is a time interval of measurements. It's a constant. For example: If V0= 0, V1= 0, V2= 2, V3= 4, V4= 8, V5=8, V6=4 [m3/h] and dT= 0,1s , then Q0= 0, Q1= 0, Q2= 1/36000, Q3= 1/36000 + 3/36000 = 4/36000 =1/9000, Q4= 4/36000 + 6/36000 = 10/36000 =1/3600, Q5= 10/36000 + 8/36000 = 18/36000 =1/2000, Q6= 18/36000 + 6/36000 = 24/36000 =1/1500 [m3] Edited 6 Sep 2018 by Inntele Share this post Link to post Share on other sites