4-channel digital input terminal NAMUR, Ex i ELX1054
Error LED 4
Signal LED 4
Error LED 2
Signal LED 2
Error LED 3 
Signal LED 3 
Error LED 1 
Signal LED 1 
Power contact
+24 V EX
Power contact
0 V EX
Input 1
Input 3
Input 2
Input 4
Top view 
extended temperature range

ELX1054 | 4-channel digital input terminal NAMUR, Ex i

ExThe ELX1054 digital input terminal acquires signals from NAMUR field devices according to EN 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.

Using a DIP switch on the side, it is possible to select channel by channel whether a positive switching or negative switching sensor is to be connected. Thus, no changes to the PLC are required for the connection of both NAMUR break contacts or make contacts.

Technical data ELX1054
Technology NAMUR DC switching amplifier
Specification IEC 60947-5-6
Number of inputs 4
Connection method 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. 200 µA
Short-circuit current typ. 7 mA
Fault detection I ≤ 200 µA (cable break), I ≥ 6.3 mA (short circuit)
Max. switching frequency typ. 5 kHz (duty factor 50 %)
Supply voltage electronics 24 V DC (via power contacts), ELX9560 power supply
Current consumption power contacts typ. 15 mA + load
Current consumption E-bus typ. 70 mA
Weight approx. 55 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/see documentation
Approvals/markings CE, UL, ATEX, IECEx, cFMus
Ex marking ATEX:
  II 3(1)G Ex ec [ia Ga] IIC T4 Gc
  II (1)D [Ex ia Da] IIIC
  I (M1) [Ex ia Ma] I
  Ex ec [ia Ga] IIC T4 Gc
  [Ex ia Da] IIIC
  [Ex ia Ma] I
  AIS Class I, II, III, Division 1, Groups A thru G
  Class I, Division 2, Groups A, B, C, D
  Class I, Zone 2, AEx nA [ia Ga] IIC T4 Gc
  Class I, Zone 2, AEx ec [ia Ga] IIC T4 Gc
  [AEx ia Da] IIIC T4
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