Introduction

Fig.4: EL5101-0090

EtherCAT Terminal, 1-channel encoder interface, incremental, 5 V DC (DIFF RS422, TTL), 1 MHz, TwinSAFE SC

The EL5101-0090 EtherCAT Terminal is an interface for the direct connection of incremental encoders with differential inputs (RS422) or TTL single-ended signals. Input frequencies up to 1 MHz can be evaluated. A period measurement and frequency measurement with a resolution of 100 ns is possible. The EL5101-0090 can also be used as bidirectional counter on channel A; channel B specifies the count direction.

Two additional 24 V digital inputs are available for saving, locking, and setting the counter value. The gate input allows the locking of the counter, alternatively with a high or low level. The latch input is similarly configurable and evaluates high or low levels.

The alarm output of an encoder can be connected and evaluated via the negative-triggered status input. The encoders can be supplied with 5 V or 24 V directly via the connection points of the terminal.

In “normal operation mode,” a 16 bit counter and a 16 bit latch for a zero pulse can be read, set, or enabled.
In “extended operation mode,” a switchable 16/32 bit counter and a 32 bit latch can be read, set, or enabled for a zero pulse.

Different functions are available in the two operation modes (see the table below)

The EL5101-0090 supports distributed clocks in the “enhanced operation mode”, i.e. the input data can be recorded synchronously with other data that are also linked to distributed clocks slaves. The accuracy across the system is < 100 ns.

The operating modes are described separately in the chapter “EL5101 - Commissioning”. During commissioning, you must decide which operation mode to use.

In addition to the full functionality of the EL5101, the EL5101-0090 supports TwinSAFE SC (Single Channel) technology. This enables the use of standard signals for safety tasks in any networks or fieldbuses.