Introduction
Incremental encoder interface, RS422, 5 MHz, Oversampling
The EL5101-0011 EtherCAT Terminal is an interface for the direct connection of incremental encoders with differential inputs (RS422). A 32-bit counter with quadrature decoder can be read and set.
The EL5101-0011 supports the oversampling principle. Using this method the resolution of the position value can be increased to n times the bus cycle time. The current counter value is thereby read 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. The transfer of a packet of n position values of 32 bits each to the higher-level controller takes place in the next fieldbus communication cycle. The minimum sampling time here is 10 µs (maximum sampling frequency 100 kSps). Areas of application of the EL5101-0011 lie in particular in the area of high-resolution position detection.
The EL5101-0011 supports distributed clocks, i.e. the input data can be synchronously acquired with other data that, similarly distributed, are connected to distributed slave clocks. The system accuracy is around < 100 ns.