TwinSAFE SC: 4-channel analog input, -10/0…+10 V, -20/0/+4…+20 mA, 16 bit EL3174-0090
Power contact
+24 V
Power contact 0 V
Ch1 U+ 
Ch2 U+ 
Ch3 U+ 
Ch4 U+ 
+24 V 
+24 V 
+24 V 
+24 V 
Ch1 U-
Ch2 U-
Ch3 U-
Ch4 U-
Input Ch1
Input Ch2
Input Ch3
Input Ch4
Top view 
Contact assembly 
extended temperature range

EL3174-0090 | TwinSAFE SC: 4-channel analog input, -10/0…+10 V, -20/0/+4…+20 mA, 16 bit

The EL3174 analog input terminal has four individually parameterisable inputs. Signals in the range from -10/0 to +10 V or -20/0/+4 to +20 mA can be processed via each channel. Physically, the voltage and current signals should be connected to different terminal points. Each channel should then be set by the controller/TwinCAT to U or I mode via CoE. The voltage inputs operate differentially; the current inputs are single-ended. All inputs are digitised with a resolution of 16 bits and transmitted, electrically isolated, to the higher-level automation device. With a technical measuring range of ±107 % of the nominal range, the terminal also supports commissioning with sensor values in the limit range and diagnostics according to NAMUR NE43.

With the aid of the TwinSAFE SC technology (TwinSAFE Single Channel) it is possible to make use of standard signals for safety tasks in any network or fieldbus. To do this, EtherCAT I/Os from the areas of analog input, position measurement or communication (4…20 mA, incremental encoder, IO-Link, etc.) are extended by the TwinSAFE SC function. The properties typical for the signals and the standard functions of the I/O components are retained. TwinSAFE SC I/Os differ optically from standard I/Os by a yellow stripe on the front of the housing.

The TwinSAFE SC technology enables communication via a TwinSAFE protocol. These connections can be distinguished from the usual secure communication via Safety over EtherCAT.

The data from the TwinSAFE SC components is fed via a TwinSAFE protocol to the TwinSAFE Logic, where it can be used in the context of safety-relevant applications. Detailed examples confirmed/calculated by the TÜV SÜD for the correct application of the TwinSAFE SC components and the respective normative classifications can be found in the TwinSAFE application manual.

Technical data EL3174-0090
Number of inputs 4
Power supply via the E-bus
Technology U differential, I single-ended
Oversampling factor
Distributed clocks yes
Distributed clock precision << 1 µs
Internal resistance > 200 kΩ | typ. 85 Ω
Input filter limit frequency 5 kHz
Common-mode voltage UCM max. 35 V (voltage measurement)
Dielectric strength max. 30 V (current measurement)
Conversion time minimum 150 µs
Measuring range, nominal -10/0…+10 V | -20/0/+4…+20 mA
Measuring range, technical -10.73…+10.73 V | -21.47…+21.47 mA
Resolution 16 bit (incl. sign)
Measuring error < ±0.3 % (relative to full scale value)
Electrical isolation 500 V (E-bus/signal voltage)
Current consumption power contacts
Current consumption E-bus typ. 200 mA
Configuration no address or configuration setting
Special features TwinSAFE SC, U/I parameterisable, ExtendedRange,standard and compact process image, activatable FIR/IIR filters
Weight approx. 65 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
Approvals/markings CE, UL
Related products  
EK1960 TwinSAFE Compact Controller
EL6910 TwinSAFE Logic
TwinSAFE SC For further TwinSAFE SC products please see the system overview.