Dear all
I am working on an installation with 9 FP1001 modules in an RS485 network. I needed to connect this system to a new device (a Moxa ethernet / RS485 converter) and got it all operating well. I am using 4 wire connections which were already in operation many years. After a few days of succesfull operation, two modules suddenly failed. I did not manage to get them going by power cycling / field point explorer restarts / plugging in an out the network connector etc. What triggers me is that for both modules the network LED is highly bright orange (I would say but the user manual says yellow). This bright LED comes on immediately after restarting the FP1001. I then replaced the two FP1001 modules with two other spare ones and got the network going again.
I am now testing the two modules on a separate test set up which I have up an running with a good working FP1001. Replacing this one with one of the failing ones gives the same problem (bright network LED activity). Is this an indication that the FP1001 are definitely broken (all other LEDs are working OK ? If yes, is there anything in my network which can cause this ? I am afraid of getting more broken FP1001 modules in the next days.
Any help is highly appreciated
Martien