We are working on AC500 redundancy test project. We got Two PM573-eth CPU's, two CM577 and 1 Ci590-CS31-HA module with AI.
The problem I am facing is syn between two controllers.when I downloaded the program, I got red Led on the syn Of CI590. How could I resolve this problem? I have set CM577 to be syn to both PlCs. What am I missing? Please need your advice.