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Hello evreryone! I want to build a Gx Work program.   The condition for auto start is when a low limit sensor is detected.   When the high limit sensor is detected, supply to the tank is stopped.                 The order in which the tanks are opened is 4,3,2,1.     Tank closing order is reversed.         Valve 5 must be closed when liquid is being supplied to the tank.   The completion of supply to the tank is confirmed by the high limit sensor. I use MOV transfer e.x D0 K1 Y01 MOV K2 D0             Y2             Y3 I want to open coli Y1 Y2 Y3 every valve how to open toether. Thank you              

Hi All! Can anyone help me regarding the following logic: 1. I have four Silos and one filling station. 2. The filling of silos starts on the bases of silo demad (i.e demand is a digital signal that comes when silo is empty) 3. I have to fill all silos according to their demand 4. Whose demand is first that is filled first 5. for e.g if all four silos are empty they all generate a demand signal. 6. If Filling of silo 1 is done and filling is in progress at silo 2 after that filling will start  in silo 3 then silo 4 as they are empty 7. In the mean time  if silo 1 empy again and filling is in progress at silo 2. The system must fill silo 3 and 4 first then go to silo 1  8. It means which demands first that is filled first (first come first serve)   

I have a waste water system and Corporate wants to know the "average" pH. Most people think its just a function of averaging the discharges. We run on a detention tank system. I think they understand finally how pH works. Unfortunately my discharge volumes differ every time, and so do my pH's. If I calculate my daily discharges pH and volumes in Excel or on my Ti-89, we are golden. The PLC, L63 rev 19.1. seems to be giving me fits. It is obviously my fault, since I am doing the programming. Has anyone attempted to do the same thing? If so how essentially did you do it? I am eventually going to make into an AOI after all this effort.   In a nut shell, I take the current volume and pH. I derive Mol . The previous discharge volume and pH and stored Mol are used to calculate a new equivalent dilution. This becomes a running average, which I have a FIFO 10 long. All new volumes, pH, and calculated Mol are stored historically 10 Long. ( 10 discharges ).  If I simulate with same volume and same pH incoming and last outgoing, pH is slightly lower. (11.7 versus 12). The math appears to be correct, it works in excel