2-channel digital input terminal NAMUR EL1052
Error LED 2
Signal LED 2
Error LED 1 
Signal LED 1 
Power contact
+24 V
Power contact 0 V
Power contact PE
Input 1
Input 2
Top view 
Contact assembly 
extended temperature range
extended shock and vibration range 25g

EL1052 | 2-channel digital input terminal NAMUR

The EL1052 digital input terminal acquires signals from NAMUR field devices according to IEC 60947-5-6. The sensors are supplied with a voltage of 8.2 V and return a diagnosable current signal. In this way, a wire breakage or short-circuit can be detected in addition to the switching state. The LEDs indicate signal or any error states, channel by channel.

Technical data EL1052 | ES1052
Technology NAMUR
Specification NAMUR DC switching amplifier (IEC 60947-5-6)
Signal type binary, current input for NAMUR sensors
Number of inputs 2
Connection technology 2-wire
Open circuit voltage typ. 8.2 V DC
“0” signal current ≤ 1.2 mA
“1” signal current ≥ 2.1 mA
Switching hysteresis typ. 350 µA
Short-circuit current typ. 7.8 mA
Fault detection I ≤ 200 µA (cable break), I ≥ 7.0 mA (short circuit)
Max. switching frequency 5 kHz (duty factor 50 %)
Internal resistance according to I/V curve IEC 60947-5-6
Distributed clocks
Supply voltage electronics 24 V DC (via power contacts)
Current consumption E-bus typ. 40 mA
Current consumption power contacts typ. 20 mA + load
Electrical isolation 500 V (E-bus/field potential)
Special features integrated reverse polarity protection
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, IECEx
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