GE PACSystems* RX3i Quick Start Manual page 9

Figure 2: Typical Multi-tier LAN Application
A typical application will take advantage of the two independent LANs. The dedicated
LAN1 port will be used for communications with plant-level or supervisory layers. The
switched LAN2 will typically be used to communicate with devices within the
manufacturing cell or process, including local HMI devices and micro-controllers.
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