The EL4134-0020 analog output terminal generates signals in the range between -10 and +10 V. The voltage is supplied to the process level with a resolution of 16 bits and is electrically isolated. The output channels of the EtherCAT Terminal have a common ground potential. The EL4134-0020 has four channels. 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/el4xxx-analog-output/el4134-0020.html