Introduction

Incremental encoder interface

The EJ5101 EtherCAT plug-in module is an interface for the direct connection of incremental encoders with differential inputs (RS422). The connection of single-ended signals (5 V) is possible. Incremental encoders with a fault message output can be connected to the status input of the interface.

A 32/16-bit counter with quadrature decoder as well as a 32/16-bit latch for the zero pulse can be read, set or activated. The EJ5101 can also be operated as a bidirectional counter terminal on channel A.

A period measurement and frequency measurement with a resolution of up to 100 ns is possible.

The gate input allows the counter to be locked at either high or low level. The latch input accepts the counter value with rising or falling edge.

Due to the optional interpolating micro-increment function, the EJ5101 can supply even more precise axis positions for dynamic axes.

The EtherCAT plug-in module EJ5101 supports the distributed clocks function (DC). This enables synchronous reading of the encoder value together with other input data in the EtherCAT system. Optionally, the timestamp of the last-registered increment edge based on the distributed clocks system is output.