Hello everyone! Is there a certain way you program to make labview execute ALL commands within a loop before going into another loop? For example, I have a while loop that stops if either the stop button is pushed or if the set point input is greater than 8. If both of these are false, then the code entered a case structure where it controls the output from a plant model. However, labview will enter the case structure without checking if both conditions are met. I've attached the VI and in the next message will post the VIs from the plant. I want it to do the below code, IF (Set Point > 8 OR Set Point < 0) THEN SET_Point OK= False ELSe SET_Point OK = True END IF IF (SET_Point OK = FALSE OR Stop Button pushed) THEN ! STOP VI ELSE ! Enter PID Control Loop END IF But labview likes to just jump around and skip parts for some reason. So when it for example, skips the OR check it uses the default value of true for the next case structure. It's driving me crazy. Can anyone please tell me why its doing this?? Thanks.

@andrewjoe777 wrote: What exactly do you mean by using a "queue"? Like I tell the parallel loop that is writing to the measurement file to wait until the plant model gives an output? Look into the Producer/Consumer architecture. It uses a queue to send data from one loop to another loop. This is a lossless transmission. So whenever your plant model has an output ready, it enqueues the data. The file write loop will dequeue the data whenever it comes in and write the data to disk. You want to do this so that the file writing doesn't interfere with the timing of your model loop.

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