PACSystems Rx3i PLCs Global Communication Fault

Hi there,

Here ins Ok Tedi Mining Limited

We have 4X Rx3i PLCs that talk to each other using Ethernet Global Data (EDG) Exchange

At the moment we a facing the issue of Global Communication(EDG) Failure

What the are the cause of this fault and where should I look at-PLC hardware or fiber optic cable?

Appreciate your assistance

Thanks