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I have 2 GE 90-70 PLC based system with redundant configuration. they are communicating on Genius bus using IC697PCM711 coprocessor module. I want to connect this to two PLC5 systems in simplex configuration but connected together with a redundant Ethernet network. I have looked at the option of AN-X-GNI gateway but they are not CE approved. Just wonder what would be best possible economical solution for this.