ADCENG

Jim, thanks for the suggestions. I am not very savvy when it comes to communications, but I have been suspecting that the EZTouch panel must be on the extreme end of meeting specs since it seems to be the only device that is having isses, and it seems to be related to newer Mitsubishi PLC's(even of the same model). An isolator is a great idea, I will try it. I have a new Mitsubishi on the way and am going to scope the old and new and see what might be going on. The environement is very clean from what I can ascertain from the customer. I did discover that he is using a Mitsubishi 25 pin to 8-pin converter in the line. It does not have external power, but it is definitely effecting the situation. Also, he make his own cable using twisted pairs and has no problem at all. If I can duplicate the problem, which is what has been the difficult part, I can test twisted and non-twisted. Thanks again for the reply. BobbyT.

Operator Interface has it's own dedicated 24VDC Power Supply. This is an RS422 issue. The Operator Interface just will not communicate at all with a new FX series PLC. I have a setup in my office with an older FX-2N and it works great. But a customer with a new FX-2N could not get them to talk. I'm even using his cable which we thought was the problem.

We recently started receiving complaints from customers that the EZTouch Operator Panel will not communicate with the Mitsubishi FX series PLC's. Customers have no problem with older PLC's of the same series, but new "out of the box" PLC's will not communicate. I have heard that Mitsubishi changed their 5V power supply and that it fluctuates more and that this may be the issue, but I can not confirm this. The problem is centered around a 15 pin to 8 pin cable that was thought to be the issue. But I have tested 7 returned cables that work fine with my "older" FX-2N. The same customer used our 15-pin to 25-pin cable with a 25-pin ti 8-pin adapter and it works fine. Here is the difference, the 25-pin has twisted pairs, the 8-in does not. But we are only talking 9 feet. Has Mitsubishi changed something that in combination with a substandard cable is now causing a problem? Any suggestings will be greatly appreciated. Bobby Thornton AutomationDirect.com Product Engineer