2-channel analog input terminal 0…20 mA, differential input, with oversampling EL3742
Run LED 2
Run LED 1 
Power contact
+24 V
Power contact 0 V
+Input 1
-Input 1
+Input 2
-Input 2
Top view 
Contact assembly 
XFC – eXtreme Fast Control
extended temperature range
extended shock and vibration range

EL3742 | 2-channel analog input terminal 0…20 mA, differential input, with oversampling

The EL3742 analog input terminal handles signals in the range between 0 and 20 mA. The voltage is digitised to a resolution of 16 bits, and is transmitted, electrically isolated, to the controller. The input channels of the EtherCAT Terminal have differential inputs and possess a common, internal ground potential. The signals are oversampled with an adjustable, integer multiple (oversampling factor: n) of the bus cycle time (n microcycles per bus cycle). For each microcycle, the EtherCAT Terminal generates a process data block that is collected and transferred during the next bus cycle. The time base of the terminal can be synchronised precisely with other EtherCAT devices via distributed clocks. This procedure enables the temporal resolution of the analog input signals to be increased to n times the bus cycle time. In conjunction with the EL47xx (analog output terminal with oversampling), responses with equidistant time intervals, e.g. in the event of a threshold value being exceeded, become possible. The distributed clocks function enables several EL3742 devices to be synchronised in almost any configuration. The maximum sampling rate per channel is 100 ksamples/s (100,000 samples/s).

Technical data EL3742 | ES3742
Number of inputs 2 (differential)
Power supply via the E-bus
Technology differential input, oversampling
Signal current 0…20 mA
Max. sampling rate max. 10 µs/100 ksps (per channel, simultaneously)
Oversampling factor n = 1…100 selectable
Input signal bandwidth 0…30 kHz recommended
Distributed clocks yes
Distributed clock precision << 1 µs
Internal resistance typ. 85 Ω + diode voltage
Input filter limit frequency 80 kHz
Common-mode voltage UCM max. 10 V
Conversion time min. 10 µs
Resolution 16 bit (incl. sign)
Measuring error < ±0.3 % (relative to full scale value) up to 10 Hz input signal
Surge voltage resistance max. 35 V
Electrical isolation 500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bus typ. 200 mA
Bit width in the process image input: n x 2 x 16 bit data; optionally 2 x 16 bit cycle counter, 4 byte StartNextLatch time
Special features oversampling
Weight approx. 60 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
Pluggable wiring for all ESxxxx terminals
Approvals/markings CE, UL, ATEX
Ex-Marking II 3 G Ex nA IIC T4 Gc
Further information  
XFC eXtreme Fast Control Technology