This could be true or false regarding to application. The control logic USES the recorded information, but should not interfere with the collecting of the information. Flowmeter #3 should be used to subtract liquids FROM the tank (Count DOWN). Why would you ever want to do that? You only want to stop and reset the information recorders at the end of a cycle, when the information has been used, and you are ready for the next cycle.īig Hint #3: The Flowmeters #1 and #2 should be used to add liquids pumped INTO the tank (Count UP). In other words, the recording of the information is kind of separate from the 'control' logic that operates the system. Information monitors should be set up so that they can record information ANY TIME that it is created. If you set up Step Relays for Mix Cycle and Drain Cycle, then getting it to work will be much easier.īig Hint #2: The flowmeters and associated counters are types of information monitors. Practice will make it easier.īig Hint #1: This project has at least 3 steps: Fill Tank, Mix Ingredients, and Drain Tank. This might be the first time that you have had to do this type of logical thinking, so it may be painful at first, like running uphill. If it is NOT RUNNING, then it must be IDLE. In my program, I put the Idle light right after the System Run output.

You just have to learn to really THINK about it. It should be exactly as you described, no more, no less. Yes, you have figured out your 'Idle' light. But a good word on the way could be draw everything down before starting coding that way the produced code will have less errors and be done a lot faster. Ooh looked at earlier post by Lancie1 he gives you a good example of clean logic to so now you should have all the tools you need to solve your problem. This example may have some errors but it ought to give you an idea how to deal with these kind of problems when you have a sequence of events. If one would like to be able to pause in the middle of the sequence just use the run flag in the actions to stop appropiate outputs and maybe in the sequence so a transition doesnt get triggered. The example operation cannot be paused even if the stop button is pushed the operation will do its cycle to the end before it stops. I have a digital input for when the tank reaches 48 degrees. In my example you have valve a and valve b one for each product both uses the same pipe and flowmeter to get down in the tank. Made an exampleprocess with first design and then implementation.

Logixpro batch simulator exercise 1