1-channel incremental encoder interface NAMUR, 32 bit, Ex i ELX5151
Error-LED B
Signal LED B
Error LED A 
Signal LED A 
Run LED 
Power contact
+24 V EX
Power contact
0 V EX
Top view 
extended temperature range

ELX5151 | 1-channel incremental encoder interface NAMUR, 32 bit, Ex i

ExThe ELX5151 EtherCAT Terminal allows the direct connection of an intrinsically safe incremental encoder from Zone 0/20 and 1/21 hazardous areas. The terminal supplies the encoder with 8.2 V DC and evaluates a diagnostic-capable NAMUR signal according to IEC 60947-5-6. In this way, a wire breakage or short circuit can be detected in addition to the switching state. The ELX5151 can also be used as an up/down counter and allows switching between 16- and 32-bit counting.

Technical data ELX5151
Technology incremental encoder interface NAMUR
Specification IEC 60947-5-6
Number of channels 1
Sensor inputs 1
Encoder connection A, B
Encoder operating voltage 8.2 V DC
Open circuit voltage typ. 8.2 V DC
“0” signal current ≤ 1.2 mA
“1” signal current ≥ 2.1 mA
Switching hysteresis 0.2 mA
Short-circuit current typ. 9 mA
Fault detection I ≤ 200 µA (cable break), I ≥ 6.0 mA (short circuit)
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. 80 mA
Distributed clocks yes
Special features up/down counters
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/see documentation
Approvals/Markings CE, ATEX, IECEx
Ex-Marking 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
further Ex components  
ELXxxxx EtherCAT Terminals with intrinsic safe in- and output
ELXxxxx-0090 EtherCAT Terminals with intrinsic safe in- and output and TwinSAFE SC
CPXxxxx Multi-touch Panel PCs and multi-touch Control Panels for use in hazardous areas, Zone 2/22