Steve Etter

Just as an informational note, Allen-Bradley has recently started allowing you to use uni-cast instead of just multicast traffic. Steve

While I have no experience with Omron PLC's, I did have a similar problem with an Allen-Bradley PLC system where I had multiple PLCs and HMIs on a system. As soon as I put the PLC behind a managed switch, my problems disappeared. One of the things a managed switch does is to manage the traffic (what a surprise, right?). This means that it knows what device (or devices) live on what ports and any traffic it sees coming in is only forwarded on to the proper port or that traffic is ignored. This, in turn, keeps the processor from having to look at, analyze, and ignore messages that are not meant for it. Now, anytime I design an Ethernet based system, I make sure to use at least one managed switch in the system. This allows me to interconnect multiple PLCs without having to worry about bogging down it or any other PLC with unnecessary traffic. Steve

Are you using a managed or unmanaged switch?

Another possibility would be that the line is a place-holder. The programmer might have figured he would need to come back and route various values but didn't have enough info to do it then and there. By writing one of these each time he came across such a situation, he entered that line so it would be easy to locate and update the code later. Steve

I don't know if it's what you are looking for, but I downloaded a batch file here on the mrplc website that will pop up a menu to let you switch between IP addresses. Selecting the "1" will configure you back to auto detect, too. IP Configuration Batch File

View File IP Configuration Batch File This is a batch file I use to automatically reconfigure my Ethernet port when I move from one network to another. It starts by finding and displaying the current address of the card and then displays a menu of IP addresses from which you can select. Once you have selected the address you want from the menu (1-5 for this file), it changes to that address and then verifies the new address and displaying it. If you enter an invalid selection, it will dump and start over without changing anything. This utility is based off of Microsoft's NETSH and SET commands. I keep this file, along with all my other batch files, in the subdirectory C:\Batch Files. I then have a shortcut on my desktop to call it. To modify, I prefer right-clicking on the batch file and selecting "Edit". For me, this brings up Notepad (my default editor) and make for easy modifications. Obviously you will need to update it to match your IP addresses, but you may need to modify the reference to "Local Area Connection" to the specific adapter name on your laptop. FYI - I am currently running this on WinXP. Submitter Steve Etter Submitted 02/04/2011 Category Free Utilities  

Surefire, First of all, congratulations on submitting the kind of "request for help" post that actually stands a chance of getting some results. You have asked for a specific kind of help rather than a "Write This Logic For Me" post. You have displayed some work - that goes a long way. Second, I'm not going to attempt to answer your question directly – partly because I would have written this completely differently and partly because you really need to figure this out for yourself. You are clearly attempting to learn this, so giving you a direct answer will be of little help there. Instead, I want to ask you to re-think your logic – re-examine what it is that you are wanting to do. After looking at your logic, I think your real solution is in a different location than you suspect and is a result of how you have chosen to describe how the system works. I suggest starting here: We want to: 1) Start the pump when a HI limit is detected and seal it in until either a LO limit is detected OR the timer times out. 2) Once shut off, the pump remains off until a HI limit is detected again. 3) The timer runs when the pump runs. 4) The timer stops when the pump stops. 5) The Valve is open when XXXX (I don't know – its not clear from your description) I will say that there is no need for compare statements or anything more complex here nor should there need to be any more rungs than there currently are. Simply re-writing what you already have should do it. Hope this helps. Steve

Telesis TMC420 Operation Manual View File Operation Manual for the Telesis TMC420 Marking System Controller for PINSTAMP® Single Pin Marking Systems. Submitter Steve Etter Submitted 09/10/2009 Category Tutorials and Guides  

Telesis TMC420 Installation/Maintenance Manual View File Installation/Maintenance Manual for the Telesis TMC420 Marking System Controller Telesis Document No. 33484, Rev. G. Submitter Steve Etter Submitted 09/09/2009 Category Tutorials and Guides