Smitty

Ok. That worked. Thank you very much for your help.

As it turns out, the V230 was somehow blowing the comms modules. I replace the unit and everything is talking.

When I try to start visilogic, I get a message that says : VisiLogic was not shut down properly. Press OK to recover. When I press OK, I get a box with this info : Message Number: -2147220898 DLL Name: UnPrHnd1 Class Name: clsDbHandle Function Name: OpenConnection Label Name: errOpenConnection Details: Error opening connection Not a valid password Any help would be greatly appreciated. Thanks

Ok. so it turns out that the cards in question just no longer work. I swapped them into the units that are communicating and they stop communicating. Maybe taken out by a voltage spike?

I am using Cat 5e cable running into and out of each device. I am using the stubs that are supplied with the communication card. I have the terminating resistors set on the last unit (UID 67). I have no other resistors on the network. I will try your suggestions and see if anything changes. Ill post my findings. Thank you.

Sorry I have taken so long to get back to this. This project got put on the back burner for a while. I have a Red Lion G306 Touch panel that I am using to communicate with The V230 PLC's. The G306 is set up as the Unitronics master and is writing to and reading an integer file via RS-485. The two PLC's at the end of my network (farthest from the G306 master) communicate just fine. The two nearest the G306 do not communicate at all. There is about 30 ft between the G306 and the first two PLC's and about 20 ft between the first two and the last two. On the V230 closest to the G306, SI 88 (Connection status:COM 3) is flashing -32768 while the other three V230's show 0. The V230 next to that one shows SI 85 (Error Code COM 3) as 15 while the others show 0. Any Ideas? Thanks

I am attempting to communicate between 4 vision 230 panels. I am sending an integer to one panel from another manufacturers HMI via 232. That works fine. I am unsure about how to share that information between the V230's via 485.