GE IC693CMM321-KL Ethernet Interface Module: Connecting Legacy PLC Systems to Modern Industrial Networks In industrial automation, communication is the foundation of control. Sensors, actuators, HMIs, SCADA systems, and enterprise platforms all depend on reliable data exchange to keep production moving. For facilities still operating GE Series 90-30 PLC systems, the challenge is not always replacing the controller. Often, it is ensuring that an established control platform