Introduction

Incremental Encoder Interface

The EJ5101-0090 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 alarm output can be connected to the status input of the interface.
A 32/16-bit counter with quadrature decoder and a 32/16-bit latch for the zero pulse can be read, set or activated. The EJ5101-0090 module can also be operated as a bidirectional counter terminal on channel A.
Interval measurement and frequency measurement with a resolution of up to 100 ns is possible.
The gate input allows the counter to be disabled either at a high or low level. The latch input accepts the counter value with a rising or falling edge.
The optional interpolating microincrements functionality enables the EJ5101-0090 EtherCAT plug-in module to provide even more precise axis positions for dynamic axes.

The EJ5101-0090 EtherCAT plug-in module supports the distributed clocks function (DC). This enables the encoder value to be read in synchronously with other input data in the EtherCAT system. Optionally, the timestamp of the last registered increment edge is output based on the distributed clocks system.

The EJ5101-0090 EtherCAT plug-in module supports the full functionality of the EJ5101 module as well as TwinSAFE SC technology (TwinSAFE Single Channel).

The TwinSAFE SC technology (TwinSAFE Single Channel) enables the use of standard signals for safety tasks in any networks or fieldbuses. The standard functionalities and features of the I/Os are retained. The data of the TwinSAFE SC I/Os are routed to the TwinSAFE logic and processed there in a multichannel safety-related manner. In the Safety Logic the data originating from different sources are analyzed, checked for plausibility and submitted to a ‘voting’. This is done using certified function blocks such as Scale, Compare/Voting (1oo2, 2oo3, 3oo5), Limit, etc. For safety reasons, at least one of the data sources must be a TwinSAFE SC component. The other data can come from other standard I/Os, drive controllers or measuring transducers.

With the aid of the TwinSAFE SC technology it is typically possible to achieve a safety level equivalent to PL d/Cat. 3 in accordance with EN ISO 13849-1 or SIL 2 in accordance with EN 62061.