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The NEF30-LDSZ-U is a plug-in type Network EtherCAT Fieldbus coupler manufactured by Prometec. It allows for the connection of up to 30 local EtherCAT slave devices and has downlink data transfer (upload) from the host to the slaves in the field. The unit is equipped with both electrical isolation and surge suppression and has a built-in status LED. It is designed to be used with the Fieldbus T connectors, and supports device configuration via SD card. It is compact, robust, and designed for harsh industrial environments.