HD EtherCAT Terminal, 5-channel input, potentiometer measurement with sensor supply EL3255
Signal ERR Ch1
Signal ERR Ch2
Signal ERR Ch3
Signal ERR Ch4
Power fail
Signal ERR Ch5
Power contact
+24 V
Power contact 0 V
0 V sensor 1 
Input sensor 1 
0 V sensor 4 
0 V sensor 2 
Input sensor 2 
0 V sensor 3 
Input sensor 3 
0 V sensor 5 
+10 V sensor 1
Input sensor 4
+10 V sensor 4
+10 V sensor 2
+10 V sensor 3
Input sensor 5
+10 V sensor 5
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

EL3255 | HD EtherCAT Terminal, 5-channel input, potentiometer measurement with sensor supply

The EL3255 EtherCAT Terminal enables potentiometers to be connected directly. A stabilised power supply in the terminal and the ratiometric measurement of the input voltage offer the preconditions for precise measurement. On account of its high sampling rate and together with potentiometer position encoders, the compact 5-channel EtherCAT terminal represents an economical position detector.

The HD EtherCAT Terminals (High Density) with increased packing density feature 16 connection points in the housing of a 12 mm terminal block.

Technical data EL3255
Number of inputs 5
Power supply via power contacts
Technology ratiometric potentiometer evaluation with supply, 3-wire
Distributed clocks yes
Feed voltage potentiometer typ. 10 V ±10 %
Internal resistance >> 100 kΩ to wiper connection
Input filter limit frequency typ. -3 dB at 3 kHz and potentiometer 50 kΩ
Sensor types potentiometer 300 Ω…50 kΩ
Output current max. 0.3 A total supply current for the potentiometers
Wiring fail indication yes
Conversion time typ. 300…700 µs, dependent on settings, default setting: approx. 500 µs (5 channels, filter deactivated)
Measuring range potentiometer 300 Ω…50 kΩ
Resolution 16 bit (incl. sign)
Measuring error < ±0.5 % (relative to full scale value)
Electrical isolation 500 V (E-bus/field potential)
Current consumption power contacts dependent on the potentiometers, max. 70 mA
Current consumption E-bus typ. 80 mA
Bit width in the process image 5 x 16 bit input
Configuration no address setting, configuration via the controller
Conductor types solid wire, stranded wire and ferrule
Conductor connection solid wire conductors: direct plug-in technique; stranded wire conductors and ferrules: spring actuation by screwdriver
Rated cross-section solid wire: 0.08…1.5 mm²; stranded wire: 0.25…1.5 mm²; ferrule: 0.14…0.75 mm²
Special features open-circuit recognition, supply monitoring, activatable filters, simultaneous measurement of the channels
Weight approx. 70 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