The EL3621-0020 analog input terminal handles signals in the range between 4 and 20 mA. The voltage is digitized to a resolution of 24 bit and is transmitted, electrically isolated, to the higher-level automation device. The terminal has a differential input. The signal state of the EtherCAT Terminal is indicated by light emitting diodes.

The desired calibration certificate can be downloaded from here using the respective serial number.

https://www.beckhoff.com/vi-vn/products/i-o/ethercat-terminals/el3xxx-analog-input/el3621-0020.html