dimented

Did you get this problem resolved. I had the same error message as you are getting under different circumstances. I found a knowledgebase article saying to empty the cache. Basically on all of your clients and servers you need to go into internet explorer to tools - options- and delete files on the general tab. Choose to delete all offline content. Somehow they have their stuff tied to the offline content of IE, and eptying the cache fixes this error.

Thanks for all of the input. It is a rotary valve being controlled by a VFD. The output to the VFD id in the form of a percentage. 0%-100%. Everything is scaled from 0-4095. I can't post a copy of my program at the moment. I have been doing tons of research and think I am understanding enough that I can maybe bring this down to more spefific questions. My first couple are: Where do you put that addresses for the 3 variables. I see that you can put the address on the main instruction for the Control Variable and the Process Variable but where do I put the address for the setpoint at. Also, can I just fill in the tieback with a 0? Or do Ineed a tag in there. This valve is controlling the last step of my batch process. So the last part of material is being put into a tank based upon weight. Once the tank gets to a certain weight the valve needs to stop letting material in. Changing the speed will control how fast the material is released thus allowing for a precise amount of material into the tank. Will the PID loop work for this scenarion? Thanks again for all of your help. I have been doing controls for years but never touched a PID loop. Mostly conveyance equipment and Automobile plants. Which didn't need any of this PID stuff.

I am a complete beginner when it comes to PID loops. After many years of programming I have some how avoided them. Well now I have a couple I need to do and although they are very simple they are throwing me for a loop. I have a VFD drive that is controlling a valve. The more material needed to go through the valve the faster the speed, the less material, the slower the speed. Hoprfully giving me a very precise amount of material going through the valve. How do I set up this PID loop in an enhanced PLC 5? I have the PID loop but am becoming a little lost from there. The way I see it I have three parts to this. The amount of material needed, the amount of material currently through the valve, and the speed in which the valve will run. I am not seeing a place for all of this data in the PID loop unless I am missing something. Could somebody please give me a hand setting up this loop? Thanks in advance!