The EL4031 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 12 bits and is electrically isolated. The output channels of the EtherCAT Terminal have a common ground potential. The EL4031 is the single-channel variant which when combined with the EL95xx is particularly suitable for signals with electrically isolated ground potentials. The output stages are powered by the 24 V supply. The signal state of the EtherCAT Terminal is indicated by light emitting diodes.
https://www.beckhoff.com/vi-vn/products/i-o/ethercat-terminals/el4xxx-analog-output/el4031.html