1-channel analog input terminal 4…20 mA, single-ended, 16 bit, HART, Ex i ELX3181
Error LED
HART error LED 1 
Error LED 1 
Run LED 
Power contact
+24 V EX
Power contact
0 V EX
Top view 
extended temperature range

ELX3181 | 1-channel analog input terminal 4…20 mA, single-ended, 16 bit, HART, Ex i

ExThe ELX3181 analog input terminal allows the direct connection of intrinsically safe HART-capable field devices located in hazardous areas classified Zone 0/20 or 1/21. It supplies measuring transducers located in the field and transmits their analog measuring signals electrically isolated to the automation device. The HART protocol (Highway Addressable Remote Transducer) enables two-way communication through digital data transfer via the analog 4…20 mA wiring. The TwinCAT FDT container enables the integration of field device DTMs into TwinCAT Engineering, so that the device configuration and diagnostic functions are available directly within the development environment. The EtherCAT Terminal indicates the signal state by means of light emitting diodes. Error LEDs signal overload and wire breakage, in addition to which LEDs provide information about the state of the HART communication and indicate any communication errors.

Technical data ELX3181
Technology intrinsically safe sensors with HART support (version 7)
Signal current 4…20 mA
Number of inputs 1 (single-ended)
Connection method 2-wire
Resolution 16 bit (incl. sign)
Measuring error < ±0.3 % (relative to full scale value)
Internal resistance typ. 250 Ω
Input filter limit frequency 25 Hz
Conversion time typ. 1 ms
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. 85 mA
Distributed clocks yes
Special features standard and compact process image, activatable FIR/IIR filters, limit value monitoring, NE43 NAMUR
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