1-channel incremental encoder interface, 5 V with two parameterizable 24 V DC outputs EL5131
Status input
Digital output 1
Digital output 2
Input A 
Input B 
Input C 
Status input 
supply +UE 
supply -U0 
Digital output 1 
Input A
Input B
Input C
supply +UE
supply -U0
Digital output 2
Top view 
Contact assembly 
XFC – eXtreme Fast Control

EL5131 | 1-channel incremental encoder interface, 5 V with two parameterizable 24 V DC outputs

The EL5131 EtherCAT Terminal is an interface for the direct connection of incremental encoders with differential inputs (RS422) or single-ended inputs (TTL and Open Collector). Two parameterizable 24 V DC push-pull, tristate outputs are available, which are set after reaching a preset count, period duration, frequency or speed value.

The encoder can be supplied with power directly from the terminal. A 32-bit counter with quadrature encoder is available. Furthermore, the counter value can be stored separately or set to a preset value via the inputs (latch, gate/latch and zero pulse C input). In addition, it is possible to lock the counter, either via the Gate/Latch input or directly via the process data. The EL5131 enables the measurement of period, frequency and speed with a resolution of 10 ns. In addition, duty cycle measurement of the incoming signal is implemented. Due to the optional interpolating micro-increment function, the EL5131 can supply even more precise axis positions for dynamic axes. In addition to that it supports the synchronous reading of the encoder value together with other input data in the EtherCAT system via the high-precision EtherCAT Distributed Clocks (DC). In addition, timestamps can be output for the last registered incremental edge, the edge at the latch input, the zero pulse track C, and when the digital outputs switch.

Technical data EL5131
Encoder type incremental, differential (RS422), single-ended (TTL, Open Collector), counter, pulse generator
Number of channels 1 x A, B, C
Encoder connection differential inputs (RS422): A, A(inv), B, B(inv), C, C(inv), single-ended connection (TTL, Open Collector): A, B, C, counter, pulse transmitter: A, B
Additional inputs latch, gate/latch (24 V DC, TON > 1 µs), status input (max. 5 V DC, negative-switching, TON > 10 µs)
Additional outputs 2x push pull, ohmic switchable (tristate)
Nominal output voltage 24 V DC (-15 %/+20 %)
Load type outputs ohmic, inductive, lamp load
Output current push mode: max. 0,5 A per channel, pull mode: 0,15 A per channel
Short-circuit current typ. < 0,16 A (push mode), typ. < 0,2 A (pull mode)
Switching times Outputs: typ. TON: 3 µs (push mode), typ. TOFF: 4 µs (pull mode), typ. 7 µs (tristate mode)
Encoder operating voltage 5 V DC (default), 12 V DC, 24 V DC switchable, 0.3 A (generated from the 24 V DC power contacts)
Counter 32 bit (default), 16/32 bit switchable
Limit frequency RS422: 20 million increments with 4-fold evaluation, corresponding to 5 MHz,
TTL: 4 million increments with 4-fold evaluation, corresponding to 1 MHz,
Open Collector: 400 kilo increments with 4-fold evaluation, corresponding to 100 kHz
Quadrature decoder 4-fold evaluation (default), 2-fold-, 1-fold evaluation switchable
Resolution 1/256 bit microincrements
Configuration via TwinCAT System Manager
Current consumption power contacts typ. 10 mA + load
Current consumption E-bus typ. 190 mA
Wiring fail indication yes, for RS422 encoder
Distributed clocks yes
Special features open-circuit recognition, period duration, frequency and duty cycle measurement, microincrements, timestamp on last incremental edge, zero pulses C, latch input, gate/latch 2 input
Weight approx. 50 g
Electrical isolation 500 V (E-bus/field potential)
Operating/storage temperature 0…+55 °C/-25…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
Protect. class/installation pos. IP 20/variable
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Approvals/markings CE
Related products
EL5102 2-channel incremental encoder interface, 5 V (RS422, TTL, Open Collector)
EL5112 2-channel incremental encoder interface, 5 V (2 x AB or 1 x ABC RS422, TTL)
EL5122 2-channel incremental encoder interface, 5 V, single ended (TTL, Open Collector)
Product announcement
estimated market release 4th quarter 2020