EL3121 – Introduction
Fig.24: EL3121EtherCAT Terminal, 1-channel analog input, current, 4 … 20 mA, 16-bit, differential
The EL3121 analog input terminal processes signals in the range 4 … 20 mA. The current is digitized to a resolution of 16 bits and transmitted, electrically isolated, to the higher-level automation device.
The input channels of the EtherCAT Terminal are differential inputs and possess a common, internal ground potential. The EL3121 is the 1-channel version and is characterized by its fine granularity and electrical isolation. A wire break or an overload condition are detected, and the terminal status is relayed to the controller via the E-bus. The error LEDs indicate an overload condition and a wire break.