The EL5101-0011 EtherCAT Terminal is an interface for the direct connection of incremental encoders with differential signals (RS422). It processes the signals for a finer resolution of position values according to the oversampling principle. The 5 V and 24 V supply of the encoder can be provided directly via the terminal connection points.

Special features:

• high-resolution position detection through oversampling principle
• up to 100 measured values per PLC cycle with 10 µs sampling time
• maximum input frequency of 5 MHz

A conventional incremental encoder reads a counter value with each bus cycle and passes it on to the higher-level controller in the next fieldbus cycle. The EL5101-0011 reads the current counter value at several configurable and equidistant times between two fieldbus communication cycles with an adjustable whole number multiple (oversampling factor: n) of the bus cycle time. A packet of n position values of 32 bits each is then transmitted to the higher-level controller in the next fieldbus communication cycle. The minimum sampling time is 10 µs (100 ksps). The EL5101-0011 terminal is especially suitable for applications where high-resolution position detection is required.

https://www.beckhoff.com/vi-vn/products/i-o/ethercat-terminals/el5xxx-position-measurement/el5101-0011.html