Incremental encoder interface with oversampling EL5101-0011
Power 5 V
Run LED 
Input C 
Input A, B 
Power contact
+24 V
Power contact 0 V
Input A, A
Input B, B
Input C, C
supply UE, U0
+24 V (2x)
0 V (2x)
Top view 
Contact assembly 
XFC – eXtreme Fast Control
extended temperature range
extended shock and vibration range

EL5101-0011 | Incremental encoder interface with oversampling

The EL5101-0011 EtherCAT Terminal is an interface for direct connection of incremental encoders with differential inputs (RS422). It resolves the position value via oversampling, a process that makes it possible to increase the resolution of the position value to n times the bus cycle time. A traditional incremental encoder interface detects a counter value with each bus cycle and forwards it to the higher-level controller during the next fieldbus cycle. The EL5101-0011 repeatedly detects – configurable and equidistant – the actual counter value between two fieldbus communication cycles with an adjustable multiple integer of the bus cycle time (oversampling factor: n) and transfers 32-bit packages of n position values to the controller during the next fieldbus communication cycle. The minimum sampling time is 10 µs (100 ksps). The EL5101-0011 is used predominantly in areas where high-resolution position detection is critical.

The 5101-0011 supports distributed clocks, i.e. the input data can be acquired synchronously with other data sources that are connected to distributed slave clocks. The system accuracy is < 100 ns.

Technical data EL5101-0011
Encoder connection A, A (inv), B, B (inv), C,C (inv), differential inputs (RS422)
Sensor inputs 1
Encoder operating voltage 5 V DC/max. 0.5 A
Encoder output current 0.5 A
Counter 1 x 32 bit
Input frequency max. 20 million increments/s (with 4-fold evaluation)
Quadrature decoder 4-fold evaluation
Commands read, set
Oversampling factor n = 1…100 selectable
Cycle time min. 500 µs
Supply voltage 24 V DC (-15 %/+20 %)
Conversion time 10 µs/100 ksps
Current consumption power contacts typ. 100 mA + load
Current consumption E-bus typ. 130 mA
Distributed clocks yes
Special features oversampling, wire breakage detection
Electrical isolation 500 V (E-bus/field potential)
Weight approx. 100 g
Operating/storage temperature -25…+60 °C/-40…+85 °C
Relative humidity 95 %, no condensation
Vibration/shock resistance conforms to EN 60068-2-6/EN 60068-2-27
EMC immunity/emission conforms to EN 61000-6-2/EN 61000-6-4
Protect. class/installation pos. IP 20/variable
Approvals CE, UL, Ex
Related products
EL5101 Incremental encoder interface with differential input, 16/32 bit
EL5101-0010 incremental encoder interface, 20 million increments/s (with 4-fold evaluation), no single-ended operation
EL5101-0090 incremental encoder interface with differential input, 16 bit, TwinSAFE SC